- Substituted Tetraethynylethylene–Tetravinylethylene Hybrids
-
A general synthetic approach to molecular structures that are hybrids of tetraethynylethylene (TEE) and tetravinylethylene (TVE) is reported. The synthesis permits the controlled preparation of many previously inaccessible structures, including examples w
- Connor, Kieran P. E.,Horvath, Kelsey L.,Magann, Nicholas L.,Sherburn, Michael S.,Sowden, Madison J.,Westley, Erin
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supporting information
p. 977 - 986
(2022/02/03)
-
- Practical access to fluorescent 2,3-naphthalimide derivatives: Via didehydro-Diels-Alder reaction
-
A practical and efficient approach for the synthesis of fluorescent 2,3-naphthalimide derivatives has been developed from readily available starting materials via an intramolecular didehydro-Diels-Alder reaction, which proceeded well under room temperature, exhibiting a wide substrate scope and good functional group tolerance. The practicability of this methodology has been verified by one-step synthesis of the environmentally sensitive fluorophore 6-DMN on a gram scale with a shorter time, fewer steps and less waste disposal, and without the utilization of toxic transition metals. The present experimental and computational studies support the crucial role of the propiolimide moiety in the transformation.
- Chen, Xia,Zhong, Cheng,Lu, Yuling,Yao, Meng,Guan, Zhenhua,Chen, Chunmei,Zhu, Hucheng,Luo, Zengwei,Zhang, Yonghui
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supporting information
p. 5155 - 5158
(2021/05/31)
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- Multicomponent Enantioselective Synthesis of Tetrahydropyridazinones Employing Chiral α,β-Unsaturated Acylammonium Salts
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An enantioselective three-component reaction was developed for the synthesis of tetrahydropyridazinones employing chiral α,β-unsaturated acylammonium salts, malonates, and azodicarboxylates. An initial α-amination of a malonate with an azodicarboxylate an
- Kiledal, Sigrid A.,Jourdain, Roxane,Vellalath, Sreekumar,Romo, Daniel
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supporting information
p. 6622 - 6627
(2021/09/13)
-
- Enantioselective Rauhut–Currier Reaction with β-Substituted Acrylamides Catalyzed by N-Heterocyclic Carbenes
-
β-Substituted acrylamides have low electrophilicity and are yet to be exploited in the enantioselective Rauhut–Currier reaction. By exploiting electron-withdrawing protection of the amide and moderate nucleophilicity N-heterocyclic carbenes, such substrates have been converted to enantioenriched quinolones. The reaction proceeds with complete diastereoselectivity, good yield, and modest enantioselectivity. Derivatizations are reported, as are computational studies, supporting decreased amide bond character with electron-withdrawing protection of the nitrogen.
- Pitchumani, Venkatachalam,Breugst, Martin,Lupton, David W.
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supporting information
p. 9413 - 9418
(2021/12/09)
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- Organic metal compound and organic light-emitting device
-
Organic metal compounds and organic light-emitting devices employing the same are provided. The organic metal compound has a chemical structure of Formula (I) or Formula (II): In particular, one of the following two conditions (1) and (2) is met: (1) R1 is deuterium or C1-6 deuterated alkyl group, when R3 and R4 are independently hydrogen, halogen, C1-6 alkyl group, C1-6 fluoroalkyl or C3-12 heteroaryl group; and (2) R1 is hydrogen, deuterium, C1-6 alkyl group, C1-6 deuterated alkyl group, C3-12 heteroaryl group, or C6-12 aryl group, when at least one of R3 and R4 is C6-12 aryl group or C6-12 fluoroaryl group.
- -
-
Paragraph 0041; 0061
(2020/02/10)
-
- Synthesis, in silico study and antimicrobial activity of new piperine derivatives containing substituted δ-esters
-
A series of fifteen new piperine-derived diesters was synthesized through the substitution reaction between the salt of piperic acid, obtained through piperine basic hydrolysis, with the δ-chloro-esters, obtained through the cleavage of tetrahydrofuran (THF) with acyl chlorides in the presence of ZnCl2. The final compounds were obtained with yields ranging from 50 to 84% and were characterized by infrared (IR) and 1H and 13C nuclear magnetic resonance spectroscopy (NMR). The new compounds were evaluated in silico in regard to their ADME (absorption, distribution, metabolism, and excretion) properties, and in vitro for their antimicrobial activity against bacteria strains (Staphylococcus aureus and Pseudomonas aeruginosas), yeast fungi (Candida albicans and C. tropicalis) and filamentous fungi (Aspergillus fumigatus, A. flavus and A. niger). The results from the in silico studies of Lipinski's rule of five showed that most compounds present good pharmacological possibilities, and the results from in vitro antimicrobial activity showed that 8 of the 15 synthesized compounds displayed antimicrobial activity, inhibiting the growth of 40-80% of tested strains, with a minimum inhibitory concentration (MIC) interval ranging from 1024 to 256 μg mL-1
- Barbosa-Filho, José M.,Brandao, Maria C. R.,De Athayde-Filho, Petr?nio F.,Dutra, Thalisson F.,Lima, Edeltrudes O.,Lira, Bruno F.,Neto, Hermes Diniz,Trindade, Emmely O.
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p. 2590 - 2602
(2020/11/18)
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- Modular Cyclopentenone Synthesis through the Catalytic Molecular Shuffling of Unsaturated Acid Chlorides and Alkynes
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We describe a general strategy for the intermolecular synthesis of polysubstituted cyclopentenones using palladium catalysis. Overall, this reaction is achieved via a molecular shuffling process involving an alkyne, an α,β-unsaturated acid chloride, which serves as both the alkene and carbon monoxide source, and a hydrosilane to create three new C-C bonds. This new carbon monoxide-free pathway delivers the products with excellent yields. Furthermore, the regioselectivity is complementary to conventional methods for cyclopentenone synthesis. In addition, a set of regio- and chemodivergent reactions are presented to emphasize the synthetic potential of this novel strategy.
- Lee, Yong Ho,Denton, Elliott H.,Morandi, Bill
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supporting information
p. 20948 - 20955
(2020/12/21)
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- Visible Light-Mediated Synthesis of Enantiopure γ-Cyclobutane Amino and 3-(Aminomethyl)-5-phenylpentanoic Acids
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A visible light-mediated [2+2] photocycloaddition of amide-linked dienes using [Ir(dtb-bpy)(dF(CF3)ppy)2]PF6 as triplet sensitizer was applied to generate a variety of N-tert-butyl, N-benzyl- and N-tert-butoxycarbonyl-protected 3-azabicyclo[3.2.0]heptan-2-ones in good yields and with good diastereoselectivity. Density functional theory calculations shed light on the conformational prerequisites for the [2+2] photocycloaddition. The bicyclic key structures could be readily transformed into γ-cyclobutane amino acids. For the obtained racemic 3-phenyl-2-aminocyclobutane-1-carboxylic acid the resolution with chiral oxazolidin-2-one is demonstrated to allow access to both enantiomers. Alternatively, a chiral auxiliary approach led as well to the enantiomerically pure target compound. Finally, the synthesis of either enantiomer of 3-(aminomethyl)-5-phenylpentanoic acid, the racemate being described as an anticonvulsant, is described.
- Kerres, Sabine,Plut, Eva,Malcherek, Simon,Rehbein, Julia,Reiser, Oliver
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supporting information
(2019/02/07)
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- Visible Light-Mediated Synthesis of Enantiopure g-Cyclobutane Amino and 3-(Aminomethyl)-5-phenylpentanoic Acids
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A visible light-mediated [2+2] photocycloaddition of amide-linked dienes using [Ir(dtb-bpy)(dF(CF3)ppy)2]PF6 as triplet sensitizer was applied to generate a variety of N-tert-butyl, N-benzyl- and N-tert-butoxycarbonyl-protected 3-aza-bicyclo[3.2.0]heptan-2-ones in good yields and with good diastereoselectivity. Density functional theory calculations shed light on the conformational prerequisites for the [2+2] photocycloaddition. The bicyclic key structures could be readily transformed into g-cyclobutane amino acids. For the obtained racemic 3-phenyl-2-aminocyclobu-tane-1-carboxylic acid the resolution with chiral oxazolidin-2-one is demonstrated to allow access to both enantiomers. Alternatively, a chiral auxiliary approach led as well to the enantiomerically pure target compound. Finally, the synthesis of either enantiomer of 3-(aminomethyl)-5-phenylpentanoic acid, the racemate being described as an anticonvulsant is described.
- Kerres, Sabine,Plut, Eva,Malcherek, Simon,Rehbein, Julia,Reiser, Oliver
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supporting information
p. 1400 - 1407
(2019/10/28)
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- Synthesis and characterization of unsaturated diacyl and alkyl-acyl piperazine derivatives
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The aim of this study is to obtain new unsaturated piperazine compounds by the reactions of piperazine (1a) and piperazine derivatives (1b–1d) with acylation reactive groups (2a–2j). Methacryloyl piperazine (1b) was synthesized from the reaction of methacrylic anhydride with piperazine (1a). Acyl chlorides (2b–2d) were prepared from the reaction of thionyl chloride with carboxylic acids (3a–3c) obtained as a result of the reaction with malonic acid and suitable aldehyde (5-methylfuran-2-carbaldehyde for 3a, cinnamaldehyde for 3b, and thiophene-2-carbaldehyde for 3c), respectively, by literature methods. Acyl chlorides 2e and 2f were obtained from the reaction of commercially purchased carboxylic acids 3d and 3e with thionyl chloride. Acyl chlorides (2g–2j) were synthesized from the reaction of thionyl chloride with carboxylic acids (3d–3g) transformed from hydrolyzation of esters (4a–4d) obtained as a result of the reaction of triethyl phosphonoacetate with a suitable ketone (acetophenone for 4a, benzophenone for 4b, 1-(5-methylfuran-2-yl)ethan-1-one for 4c, and 1-(thiophen-2-yl)ethan-1-one for 4d), respectively, by literature methods. Unsaturated piperazine derivatives 5a and 5b were obtained from the reaction of 1b with 2b and 2e, respectively. In addition, from the reaction of 1b and acyl chlorides (2b–2j), unsaturated piperazines (5c–5k) were synthesized in medium to good yields (63%–84%). Also, 5l–5g and 5r–5w were obtained from the reaction of allyl piperazine (2c) and cinnamyl piperazine (2d) with acyl chlorides (2a–2f).
- Sari, Sait,ünalan, Seda,Yilmaz, Mehmet
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p. 1656 - 1671
(2020/01/03)
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- Preparation method and product of carbazolyl-containing chalcone
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The invention discloses a preparation method of carbazole-containing chalcone. The preparation method comprises the following steps: a formulated amount of substituted acrylic acid (A) and phosphorus pentachloride (B) are added into a reaction vessel, and
- -
-
Paragraph 0097
(2018/03/28)
-
- Enantioselective Isothiourea-Catalysed Michael-Michael-Lactonisation Cascade Reaction for the Synthesis of δ-Lactones and 1,2,3,4-Substituted Cyclopentanes
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This manuscript describes the application of α,β-unsaturated acyl ammonium intermediates in a Michael-Michael-lactonisation cascade process to furnish δ-lactones. Generation of α,β-unsaturated acyl ammonium intermediates was achieved upon addition of isothiourea catalyst HyperBTM into α,β-unsaturated acid chlorides. Subsequent reaction with enone-malonates gave access to δ-lactones in 20-64% yield, 72.5:27.5 to 95:5 er and 81:19 to >95:5 dr. Additionally, application of a ring-opening protocol yielded 1,2,3,4-substituted cyclopentanes in 28-77% yield, 76:24 to 98:2 er and 86:14 to >95:5 dr. Interestingly, the highest er was observed at high reaction temperatures, with 70°C proving optimal. This effect was investigated by conducting an Eyring analysis, which indicated that differential activation entropy rather than differential activation enthalpy is responsible for enantiodiscrimination in this process.
- Robinson, Emily R. T.,Frost, Aileen B.,Elías-Rodríguez, Pilar,Smith, Andrew D.
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supporting information
p. 409 - 423
(2016/12/24)
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- PROPENAMIDE THIOPHENE DERIVATIVES AS FLAVIVIRUS INHIBITORS AND THEIR USE
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The present invention deals with new flavivirus inhibitors, compositions comprising said inhibitors and methods for the treatment of disorders related to a viral infection, such as a disease due to a flavivirus infection, comprising administering said inhibitors.
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Page/Page column 28; 41
(2017/07/06)
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- Lewis Acid Enabled Copper-Catalyzed Asymmetric Synthesis of Chiral β-Substituted Amides
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Here we report that readily available silyl- and boron-based Lewis acids in combination with chiral copper catalysts are able to overcome the reactivity issues of unactivated enamides, known as the least reactive carboxylic acid derivatives, toward alkyla
- Rodríguez-Fernández, Mamen,Yan, Xingchen,Collados, Juan F.,White, Paul B.,Harutyunyan, Syuzanna R.
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supporting information
p. 14224 - 14231
(2017/10/17)
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- Design synthesis and biological evaluation of novel N-nitro acid amide derivatives as lead compounds of herbicide
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A series of N-nitro acid amide derivatives compounds were synthesized based on the active site of target acetohydroxyacid synthase (AHAS, EC: 2.2.1.6) enzyme. All the structures of newly prepared compounds were thoroughly characterized by satisfied IR and 1H NMR spectra. The IC50 values against AHAS enzyme and EC50 values for herbicidal activity against Amaranthus mangostanus L. and Sorghum sudanense of all synthesized target compounds were determined. The compounds II-10, II-21, and II-22 with IC50 values of 7.09 mg/L, 9.07 mg/L, and 9.11 mg/L and the compounds II-8 and II-22 with EC50 values of 9.87 mg/L and 19.88 mg/L against root of Amaranthus mangostanus L. and Sorghum sudanense were illustrated, respectively. Meanwhile, the possible reasons for the lower activity of compounds were analyzed by molecular docking prediction.
- Qi, Xiaojuan,Tang, Wenjie,Gao, Shan,Gao, Min,Chen, Changshui,Zhang, Qingye
-
-
- Synthesis of 2-(hetero)aryl-5-(trimethylsilylethynyl)oxazoles from (hetero)arylacrylic acids
-
A three-step method for the synthesis of 2-(hetero)aryl-5-(trimethylsilylethynyl)oxazoles is described. Easily accessible bis(trimethylsilyl)acetylene and acrylic acid derivatives are used as starting materials for the preparation of mono- and disubstituted 5-(trimethylsilyl)pent-1-en-4-yn-3-ones. Oxidative phthalimidoaziridination of these enynones provides the key 2-acyl-1-phthalimidoaziridines that are further utilized in the thermal expansion of the three-membered ring to furnish the target functionalizable oxazoles.
- Pankova, Alena S.,Stukalov, Alexander Yu.,Kuznetsov, Mikhail A.
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supporting information
p. 1826 - 1829
(2015/04/27)
-
- Synthesis and antibacterial activity of 4'3-O-(trans-β-arylacrylamido)carbamoyl azithromycin analogs
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Novel 4'3-O-(trans-β-arylacrylamido)carbamoyl azithromycin analogs were designed, synthesized and evaluated for their antibacterial activity against nine significant pathogens using broth microdilution method. A majority of these derivatives maintained the activity of azithromycin against susceptible Streptococcus pyogenes and all the compounds demonstrated remarkably improved activity compared with the references against all the three phenotypes of resistant Streptococcus pneumoniae. In particular, compound 24 exhibited the most potent activity against susceptible Staphylococcus aureus (MIC = 0.5 μg/mL), S. pneumoniae (MIC = 0.06 μg/mL) and S. pyogenes (MIC = 0.25 μg/mL). The most active compound 7 (MIC = 0.015 μg/mL) against resistant S. pneumoniae expressing the mefA gene, exhibited 512 and 256-fold more potent activity than erythromycin and azithromycin, respectively. Compounds 28 (MIC = 0.5 μg/mL), 29 (MIC = 0.25 μg/mL) and 30 (MIC = 0.5 μg/mL) demonstrated potent activity against resistant S. pneumoniae expressing the ermB gene, which were 256, 512 and 256-fold better than the references, respectively.
- Yan, Mi,Ma, Xiaodong,Dong, Ruiqian,Li, Xin,Zhao, Can,Guo, Zhenzhen,Shen, Yan,Liu, Fang,Ma, Ruixin,Ma, Shutao
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p. 506 - 515
(2015/10/06)
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- Necrosulfonamide inhibits necroptosis by selectively targeting the mixed lineage kinase domain-like protein
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Through high-throughput screening of 200000 compounds and subsequent structure-activity relationship (SAR) studies we identified necrosulfonamide (NSA) as a potent small molecule inhibitor for necroptosis, induced by a combination of TNF-a, Smac mimetic, and z-VAD-fmk (T/S/Z). Applying a forward chemical genetic approach, we utilized an NSA based chemical probe to further reveal that NSA selectively targeted the Mixed Lineage Kinase Domain-like Protein (MLKL) to block the necrosome formation.
- Liao, Daohong,Sun, Liming,Liu, Weilong,He, Sudan,Wang, Xiaodong,Lei, Xiaoguang
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supporting information
p. 333 - 337
(2014/03/21)
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- Preparation of conjugated 1,3-enynes by Rh(III)-catalysed alkynylation of alkenes via C-H activation
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An experimentally simple additive-free Rh(III)-catalysed direct alkynylation of alkenes has been developed. This protocol employs commercially available TIPS-EBX as the alkyne source, giving access to conjugated terminal enynes following a simple silyl-de
- Collins, Karl D.,Lied, Fabian,Glorius, Frank
-
supporting information
p. 4459 - 4461
(2014/04/17)
-
- Rh(III)-catalyzed halogenation of vinylic C-H bonds: Rapid and general access to Z-halo acrylamides
-
Herein, the regio- and stereoselective iodination, along with some examples for the bromination, of readily available acrylamides to access a variety of differently substituted Z-haloacrylic acid derivatives is reported. The reaction proceeds under mild conditions via a Rh(III)-catalyzed C-H-activation/ halogenation mechanism and represents a rare example of a direct halogenation of electron-poor acrylic acid derivatives.
- Kuhl, Nadine,Schroeder, Nils,Glorius, Frank
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supporting information
p. 3860 - 3863
(2013/09/02)
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- BENZOTHIOPHENE SULFONAMIDES AND OTHER COMPOUNDS THAT INTERACT WITH GLUCOKINASE REGULATORY PROTEIN
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The present invention relates to benzothiophene sulfonamides and other compounds that interact with glucokinase regulatory protein. In addition, the present invention relates to methods of treating type 2 diabetes, and other diseases and/or conditions where glucokinase regulatory protein is involved using the compounds, or pharmaceutically acceptable salts thereof, and pharmaceutical compositions that contain the compounds, or pharmaceutically acceptable salts thereof.
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Page/Page column 356
(2013/12/03)
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- SAR, cardiac myocytes protection activity and 3D-QSAR studies of salubrinal and its potent derivatives
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Salubrinal is a selective inhibitor of endoplasmic reticulum (ER) stress and affords remarkable protection to cardiomyocytes. By studying the structure-activity relationship (SAR) of salubrinal, it was found that modification of the quinoline ring terminus and thiourea unit could confer the compound PP1-24 with markedly enhanced cardioprotective activity (EC 50 2 = 0.741, r2 = 0.991).
- Liu,He,Li,Li,Liu,Zhong,Li
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p. 6072 - 6079
(2013/02/22)
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- The combination of 4-anilinoquinazoline and cinnamic acid: A novel mode of binding to the epidermal growth factor receptor tyrosine kinase
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A novel type of cinnamic acid quinazoline amide derivatives (20-42), which designed the combination between quinazoline as the backbone and various substituted cinnamic acid as the side chain, have been synthesized and their biological activities were evaluated within cytotoxicity assay firstly and then potent EGFR inhibitory activity. Compound 42 demonstrated the most potent inhibitory activity (IC50 = 0.94 μM for EGFR), which could be optimized as a potential EGFR inhibitor in the further study. Docking simulation was performed to position compound 42 into the EGFR active site to determine the probable binding model. Analysis of the binding conformation of 42 in active site displayed compound 42 was stabilized by hydrogen bonding interactions with Lys822, which was different from other derivatives. In the further study, Compounds 43 and 44 had been synthesized and their biological activities were also evaluated, which were the same as that we expected. Compound 43 has demonstrated significant EGFR (IC50 = 0.12 μM) and tumor growth inhibitory activity as a potential anticancer agent.
- Li, Dong-Dong,Lv, Peng-Cheng,Zhang, Hui,Zhang, Hong-Jia,Hou, Ya-Ping,Liu, Kai,Ye, Yong-Hao,Zhu, Hai-Liang
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experimental part
p. 5012 - 5022
(2011/10/04)
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- Design, synthesis, and insecticidal activity of 1,5-diphenyl-1-pentanone analogues
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Three series of novel 1,5-diphenyl-1-pentanone derivatives were designed and synthesized. Their structures were characterized by IR, 1H NMR techniques, and elemental analysis. The insecticidal activities of the new compounds were preliminarily evaluated. The bioassay results indicated that the compounds X11-X30 displayed better aphicidal activity against Aphis gossypii than compounds X1-X10 and the lead compound (E)-1,5-diphenyl-1-penten-1-one (A). The inhibitory rates of compounds X6 and X29 were 100% against Plutella xylostella (L.) at 600 mg·L-1. Compounds X12, X13, X19, X24, X25, X26 and X27 showed higher insecticidal activity against Tetranychus cinnabarinus (Boisduval) at 600 mg·L-1 than the lead compound (A).
- Yang, Shaoxiang,Kang, Tieniu,Rui, Changhui,Yang, Xinling,Sun, Yufeng,Cui, Zining,Ling, Yun
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experimental part
p. 2394 - 2400
(2012/02/04)
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- Role of terminal heterocyclic ring on mesomorphic properties of homologous series
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Two new homologous series of compounds with a heterocyclic ring having sulfur and oxygen as a hetero atom derived from p-hydroxy acetophenone and alkoxy aniline containing cinnamate-azomethine as central linkages have been synthesized. viz. 4(furalacryloxy) α-methyl benzylidine-4′-alkoxy aniline and 4(thianylacryloxy) α-methyl benzylidine-4′-alkoxy aniline. The compound of both the series have been characterized by elemental analysis, FT-IR, 1H-NMR, and mass spectrometry method. Their liquid crystalline properties have been investigated by optical polarizing microscopy and differential scanning calorimetry (DSC) studies. All the derivatives are mesomorphic in nature showing the nemetic phase. The mesomorphic properties of the present two series are compared with other structurally related series to evaluate the effect of thiophene and furan on mesomorphism. Copyright Taylor & Francis Group, LLC.
- Thaker,Patel,Solanki,Dhimmer,Dave
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experimental part
p. 63 - 80
(2010/09/05)
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- A simple approach to pyrazol-3-ones via diazenes
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An efficient entry into pyrazol-3-ones is described starting from propenoic acids that were first transformed into the corresponding hydrazides. Oxidation of the hydrazides gave the diazenes and the latter cyclized to pyrazol-3-ones on treatment with ZrCl4. The methoxycarbonyl protection of the N-1 of the pyrazolone derivatives was easily removed under mild reaction conditions.
- Burja, Bojan,Ko?evar, Marijan,Polanc, Slovenko
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experimental part
p. 8690 - 8696
(2009/12/26)
-
- Diastereoselective cobalt-catalyzed alkylative aldol cyclizations using trialkylaluminum reagents
-
(Chemical Equation Presented) Co(acac)2?·2H2O serves as an effective precatalyst for alkylative aldol cyclizations of ?±,?2-unsaturated amides with ketones using trialkylaluminum reagents. These reactions provide ?2-hydroxylactams containing three contiguous stereocenters with high levels of diastereoselection. ? 2008 American Chemical Society.
- Rudkin, Mairi E.,Joensuu, Pekka M.,MacLachlan, William S.,Hon, Wai Lam
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supporting information; experimental part
p. 2939 - 2942
(2009/04/18)
-
- Synthesis and in vitro antitrypanosomal activity of novel Nifurtimox analogues
-
Eight novel analogues of Nifurtimox, 4-[(5-nitrofurfurylidene)amino]-3- methylthiomorpholine-1,1-dioxide, containing alfa-beta unsaturated amides, were synthesized and evaluated for their in vitro activity against Trypanosoma cruzi epimastigotes. Four der
- Pozas, Rocio,Carballo, Javier,Castro, Clementina,Rubio, Julieta
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p. 1417 - 1421
(2007/10/03)
-
- CHEMICAL COMPOUNDS
-
Compounds of formula (I): compositions comprising them, processes for preparing them and their use in medical therapy (for example modulating CCR5 receptor activity in a warm blooded animal).
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-
-
- Synthesis of unsymmetrically substituted 1,3-butadiynes and 1,3,5-hexatriynes via alkylidene carbenoid rearrangements
-
Unsymmetrically substituted 1,3-butadiynes and 1,3,5-hexatriynes are synthesized in four steps from commercially available aldehydes or carboxylic acids. The key step in this process involves a Fritsch-Buttenberg-Wiechell rearrangement, in which an alkylidene carbenoid intermediate subsequently rearranges to the desired polyyne. This rearrangement proceeds under mild conditions, and it is tolerant of a range of functionalities. In general, the procedurally facile formation of the dibromoolefinic precursors, in combination with the effectiveness of the rearrangement step, makes this procedure an attractive alternative to traditional methods for di- and triyne synthesis that utilize palladium or copper catalysis.
- Shi Shun, Annabelle L. K.,Chernick, Erin T.,Eisler, Sara,Tykwinski, Rik R.
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p. 1339 - 1347
(2007/10/03)
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- Potent and selective ligands for the dopamine transporter (DAT): Structure-activity relationship studies of novel 4-[2- (diphenylmethoxy)ethyl]-1-(3-phenylpropyl)piperidine analogues
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Molecular structural modifications of 4-[2-(diphenylmethoxy)ethyl]- 1- (3-phenylpropyl)piperidine (1a), a dopamine transporter (DAT)-specific ligand, generated several novel analogues. Biological activities of these new molecules for their binding to the
- Dutta, Aloke K.,Coffey, Lori L.,Reith, Maarten E.A.
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p. 699 - 705
(2007/10/03)
-
- Stereoselectivity and Generality of the Palladium-Catalysed Cyclopropanation of α,β-Unsaturated Carboxylic Acids Derivatized with Oppolzer's Sultam
-
A series of α,β-unsaturated carboxylic acids derivatized with camphorsultam 1 a s a chiral auxiliary has been stereoselectively cyclopropanated. the selectivity of the reaction produces cyclopropanated products with the 1R,2R absolute configuration as indicated by the optical rotations as well as by an X-ray structure determineation.The temperature dependence of the reaction was studied with three substrates. the highest stereoselectivity was obtained at temperatures above 25 deg C.Branching at the α- or β-carbons disfavours complete conversion, and electron-withdrawing substituents at these positions seem to prevent the reaction.The auxiliary was removed by using titanium(IV) isopropoxide in benzyl alcohol followed by alkaline hydrolysis of the intermediate ester. the potent 5-HT1A receptor agonist (1R,2S)-2-(2-hydroxyphenyl)-N,N-dipropylcyclopropylamine 13 was synthesized by this method
- Vallaerda, Jerk,Appelberg, Ulf,Csoeregh, Ingeborg,Hacksell, Uli
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p. 461 - 470
(2007/10/02)
-
- Flash Vacuum Pyrolysis of Stabilised Phosphorous Ylides. Part 6. Pyrolysis of Substituted Cinnamoyl Ylides as a Route to Conjugated Enynes
-
The substituted cinnamoyl ylides 6 and 7, readily prepared in one step from the quaternary phosphonium salts 8 and cinnamoyl chlorides 9, undergo extrusion of Ph3PO upon FVP to give the 1,3-enynes 12 and 13 in moderate yield.At 500 deg C there is little double bond isomerisation, but at 700 deg C this does occur to give almost 1:1 mixtures of E and Z isomers.In a few cases, including those with a nitrophenyl group present, the yields are poor or the reactions fail stabilised ylide was only partly successful since the severe conditions required for loss of the ester group resulted in significant isomerisation to naphthalene.The fully assigned 13C NMR spectra for 20 enynes are reported.One examples of the isomeric β,γ-unsaturated-δ-oxo ylides, 14 has been prepared and is found to undergo loss of Ph3P on FVP at 700 deg C to give indene and benzene in low yield.
- Aitken, R. Alan,Boeters, Christine,Morrison, John J.
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p. 2473 - 2480
(2007/10/02)
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- Stereoselective palladium-catalyzed cyclopropanation of α,β-unsaturated carboxylic acids derivatized with Oppolzer's sultam
-
N-enoyl sultans, derived from α,β-unsaturated carboxylic acids and bornane[10,2]sultam, undergo a stereoselective Pd-catalyzed cyclopropanation upon treatment with diazomethane. The stereoselectivity of the reaction is temperature dependent.
- Vallgarda,Hacksell
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p. 5625 - 5628
(2007/10/02)
-
- The Thienopyridine and Furopyridine Rings: New Pharmacophores with Potential Antipsychotic Activity
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Two new arylpiperazine derivatives, the 4-(1-piperazinyl)thieno- and -furopyridine ring systems, have been synthesized and appended via tetramethylene chains to various imide rings.Target compounds from each series were found to have significant activity in the blockade of apomorphine stereotypy and apomorphine-induced climbing, the Sidman avoidance response, and the conditioned avoidance response.In addition, while potent affinity for serotonin 5-HT1 and 5-HT2 receptors was observed for both the thieno- and furopyridine derivatives,the interaction of these molecules with the dopamine D2 receptor was weak.Electrophysiological studies of the lead prototypes from each series, involving compounds 22 and 33, indicate these two molecules have distinctively different effects on dopamine neurons in areas A9 and A10.Despite the similarity these molecules share in their behavioral indices of antipsychotic acivity, it is likely that the thieno- and furopyridine rings employ different mechanisms to achieve this convergence of biological effects.
- New, James S.,Christopher, William L.,Yevich, Joseph P.,Butler, Rhett,Schlemmer, R. Francis,et al.
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p. 1147 - 1156
(2007/10/02)
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- Pyrimidine Derivatives. 4. Synthesis and Antihypertensive Activity of 4-Amino-2-(4-cinnamoylpiperazino)-6,7-dimethoxyquinazoline Derivatives
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A series of 30 4-amino-2-(4-cinnamoylpiperazino)-6,7-dimethoxyquinazoline derivatives was prepared and tested for their ability to reduce blood pressure in conscious, spontaneously hypertensive rats (SHR).A number of these compounds, notably 4-amino-2-(4-
- Sekiya, Tetsuo,Hiranuma, Hidetoshi,Hata, Shunsuke,Mizogami, Susumu,Hanazuka, Mitsuo,Yamada, Shun-ichi
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p. 411 - 416
(2007/10/02)
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