- Bioinspired Diastereoconvergent Synthesis of the Tricyclic Core of Palodesangrens via Diels-Alder Reaction, LiAlH4-Mediated Isomerization, and Acid-Mediated Cyclization
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The cyclohexene moiety of the tricyclic 6,7-diaryl-tetrahydro-6H-benzo[c]chromene core of palodesangrens could be assembled in a biomimetic and step-economical fashion by the Diels-Alder reaction between the electron-rich (E)-1,3-butadienylarenes as the diene and the electron-deficient chalcones as the dienophile. During the reduction of ketone to the corresponding alcohol by LiAlH4, the mixture of endo and exo isomers underwent a novel diastereoconvergent LiAlH4-mediated isomerization to install the desired stereochemistry at C10a. Subsequent pyran ring closure under acidic conditions installed the stereochemistry at the remaining C6. Overall, the tricyclic core of palodesangrens could be prepared in three steps and up to 38% yield.
- Songthammawat, Poramate,Wangngae, Sirilak,Matsumoto, Koki,Duangkamol, Chuthamat,Ruchirawat, Somsak,Ploypradith, Poonsakdi
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p. 5225 - 5241
(2018/05/07)
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- Synthetic study of biphenylquinolizidine alkaloids I. Asymmetric total synthesis of lasubine I featuring organocatalyzed asymmetric intramolecular aza-Michael addition
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A new procedure for the asymmetric total synthesis of lythraceous alkaloids with a 4-arylquinolizidine skeleton was developed, which involved an organocatalyzed asymmetric intramolecular aza-Michael addition.
- Hirama, Taku,Umemura, Takayuki,Kogure, Noriyuki,Kitajima, Mariko,Takayama, Hiromitsu
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supporting information
p. 223 - 226
(2016/12/28)
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- Eriodictyol synthesis method
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The invention provides an eriodictyol synthesis method. According to the eriodictyol synthesis method, isovanillin and 2,4,6-trihydroxyacetophenone are selected as starting materials, and eriodictyol is obtained through the following five steps: firstly, performing MOMCl protection on a hydroxyl of isovanillin; secondly, performing MOMCl protection on a hydroxyl of 2,4,6-trihydroxyacetophenone; thirdly, performing an aldol condensation reaction to generate chalcone; fourthly, performing Michael addition and cyclization; finally, carrying out MOM deprotection to obtain eriodictyol of which the total yield is 50-65%. As isovanillin and 2,4,6-trihydroxyacetophenone are selected as the starting materials, the eriodictyol synthesis method is high in yield and suitable for industrialized production.
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Paragraph 0024; 0026
(2016/10/07)
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- (E)-1-(5-METHOXY-2,2-DIMETHYL-2H-CHROMEN-8-YL)-3-(4-METHOXYPHENYL)PROP-2-EN-1-ONE AND ANALOGS THEREOF, AS WELL AS PREPARATION METHOD AND USE THEREOF
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The present invention relates to millepachine ((E)-1-(5-methoxy-2,2-dimethyl-2H-chromen-8-yl)-3-(4-methoxyphenyl)prop-2-en-1-one) and its analogues. The present invention provides methods for preparing these compounds, pharmaceutical compositions includin
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Paragraph 0168; 0169; 0192; 0193
(2015/05/26)
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- Total synthesis of plagiochin G and derivatives as potential cancer chemopreventive agents
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A new and efficient total synthesis has been developed to obtain plagiochin G (22), a macrocyclic bisbibenzyl, and four derivatives. The key 16-membered ring containing biphenyl ether and biaryl units was closed via an intramolecular SNAr reaction. All synthesized macrocyclic bisbibenzyls inhibited Epstein-Barr virus early antigen (EBV-EA) activation induced by the tumor promoter 12-O-tetradecanoylphorbol-13-acetate (TPA) in Raji cells and, thus, are potential cancer chemopreventive agents.
- Li, Rui-Juan,Zhao, Yu,Tokuda, Harukuni,Yang, Xiao-Ming,Wang, Yue-Hu,Shi, Qian,Morris-Natschke, Susan L.,Lou, Hong-Xiang,Lee, Kuo-Hsiung
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supporting information
p. 6500 - 6503
(2014/12/10)
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- COMPOUNDS, COMPOSITIONS, AND METHODS FOR MODULATING SWEET TASTE
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The present invention provides edible compositions comprising a sweet taste modulator of the present invention, food products comprising such edible compositions and methods of preparing such food products. The present invention also provides methods of reducing the amount of sugar in a food product, methods of reducing the caloric intake in a diet, and methods of enhancing sweet taste in a food product.
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Paragraph 0304
(2014/10/04)
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- Synthesis and biological evaluation of novel pyranochalcone derivatives as a new class of microtubule stabilizing agents
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Twenty-five novel pyranochalcone derivatives were synthesized and evaluated for their in vitro and in vivo antiproliferative activities. Among them, compound 10i exhibited superior potent activity against 21 tumor cell lines including multidrug resistant phenotype with the IC50 values ranged from 0.09 to 1.30 μM. In addition, 10i significantly induced cell cycle arrest in G2/M phase, promoted tubulin polymerization into microtubules and caused microtubule stabilization. Further studies confirmed that 10i significantly suppressed the growth of tumor volume in HepG2 xenograft tumor model. Our study demonstrated that 10i could have beneficial antitumor activity as a novel microtubule stabilizing agent.
- Cao, Dong,Han, Xiaolei,Wang, Guangcheng,Yang, Zhuang,Peng, Fei,Ma, Liang,Zhang, Ronghong,Ye, Haoyu,Tang, Minghai,Wu, Wenshuang,Lei, Kai,Wen, Jiaolin,Chen, Jinying,Qiu, Jingxiang,Liang, Xiaolin,Ran, Yan,Sang, Yun,Xiang, Mingli,Peng, Aihua,Chen, Lijuan
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supporting information
p. 579 - 589
(2013/05/09)
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- Enantioselective synthesis of orthogonally protected (2R,3R)-(-)- epicatechin derivatives, key intermediates in the de novo chemical synthesis of (-)-epicatechin glucuronides and sulfates
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Ten orthogonally protected (-)-epicatechin and 3′- or 4′-O-methyl-(-)-epicatechin derivatives were prepared in a regiospecific and enantioselective manner. For each orthogonally protected (-)-epicatechin derivative, one specific phenolic hydroxyl was protected with a methoxymethyl (MOM) or p-methoxybenyzl (PMB) group and the remainder were protected as benzyl ethers. These uniquely protected (-)-epicatechin derivatives were designed to facilitate the regiospecific installation of a glucuronic acid or sulfate unit onto (-)-epicatechin after selective removal of the MOM or PMB protecting group to provide authentic standards of (-)-epicatechin glucuronides and sulfates.
- Zhang, Mingbao,Erik Jagdmann Jr.,Van Zandt, Michael,Beckett, Paul,Schroeter, Hagen
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p. 362 - 373
(2013/06/27)
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- Small molecules that protect against β-amyloid-induced cytotoxicity by inhibiting aggregation of β-amyloid
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Aggregated β-amyloid (Aβ) plays crucial roles in Alzheimer's disease (AD) pathogenesis, therefore blockade of Aβ aggregation is considered as a potential therapeutic target. We designed and synthesized small molecules to reduce Aβ-induced cytotoxicity by inhibiting Aβ aggregation. The small molecules were screened via ThT, MTT, and cell-based cytotoxicity assay (Aβ burden assay). Selected compounds 1c, 1d, 1e, and 1f were then investigated by evaluating their effects on cognitive impairment of acute AD mice model. Learning and memory dysfunction by injection of Aβ(1-42) was recovered by administration of these molecules. Especially, 1d showed the best recovery activity in Y-maze task, object recognition task, and passive avoidance task with dose dependent manner. These results suggest that 1d has high potential as a therapeutic agent for AD.
- Lee, Yun Suk,Kim, Hye Yun,Kim, Youngsoo,Seo, Jae Hong,Roh, Eun Joo,Han, Hogyu,Shin, Kye Jung
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experimental part
p. 4921 - 4935
(2012/10/08)
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- Total synthesis of (±)-morphine
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The morphinan skeleton was effectively synthesized by an intramolecular Mannich-type reaction. Further transformation led to total synthesis of morphine.
- Uchida, Kenji,Yokoshima, Satoshi,Kan, Toshiyuki,Fukuyama, Tohru
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p. 5311 - 5313
(2007/10/03)
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- Substituted trans-stilbenes, including analogues of the natural product resveratrol, inhibit the human tumor necrosis factor alpha-induced activation of transcription factor nuclear factor kappaB
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The transcription factor nuclear factor kappaB (NF-κB), which regulates expression of numerous antiinflammatory genes as well as genes that promote development of the prosurvival, antiapoptotic state is up-regulated in many cancer cells. The natural product resveratrol, a polyphenolic trans-stilbene, has numerous biological activities and is a known inhibitor of activation of NF-κB, which may account for some of its biological activities. Resveratrol exhibits activity against a wide variety of cancer cells and has demonstrated activity as a cancer chemopreventive against all stages, i.e., initiation, promotion, and progression. The biological activities of resveratrol are often ascribed to its antioxidant activity. Both antioxidant activity and biological activities of analogues of resveratrol depend upon the number and location of the hydroxy groups. In the present study, phenolic analogues of resveratrol and a series of substituted trans-stilbenes without hydroxy groups were compared with resveratrol for their abilities to inhibit the human tumor necrosis factor alpha-induced (TNF-α) activation of NF-κB, using the Panomics NF-κB stable reporter cell line 293/NF-κB-luc. A series of 75 compounds was screened to identify substituted trans-stilbenes that were more active than resveratrol. Dose-response studies of the most active compounds were carried out to obtain IC50 values. Numerous compounds were identified that were more active than resveratrol, including compounds that were devoid of hydroxy groups and were 100-fold more potent than resveratrol. The substituted trans-stilbenes that were potent inhibitors of the activation of NFκB generally did not exhibit antioxidant activity. The results from screening were confirmed using BV-2 microglial cells where resveratrol and analogues were shown to inhibit LPS-induced COX-2 expression.
- Heynekamp, Justin J.,Weber, Waylon M.,Hunsaker, Lucy A.,Gonzales, Amanda M.,Orlando, Robert A.,Deck, Lorraine M.,Vander Jagt, David L.
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p. 7182 - 7189
(2007/10/03)
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- PYRROLE DERIVATIVE
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A novel pyrrole derivative represented by the following formula (1) and a salt thereof: wherein R1 means substituted alkenyl, etc.; R2 means substituted benzoyl, etc.; and R3 to R5 each means hydrogen, alkyl, halogeno, etc. The derivative and salt have antidiabetic activity.
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- Studies on flavans. III. The total synthesis of (±)-7,4′ -dihydroxy-3′-methoxyflavan, (±)-7,3′-dihydroxy-4′ -methoxyflavan, and (±)-7,4′-dihdroxyflavan
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The first total synthesis of (±)-7,3′-dihydroxy-4′ -methoxyflavan (1) and (±)-7,4′-dihydroxy-3′-methoxyflavan (2), along with the synthesis of (±)-7,4′-dihydroxyflavan (3), three naturally occurring flavans, were described. The key step is the cyclization of 1,3-diaryl-1-propanol by BF3·Et2O.
- Xue, Jijun,Zhang, Xianshu,Chen, Xuesong,Zhang, Yingpeng,Li, Ying
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p. 3527 - 3536
(2007/10/03)
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- Synthesis and 11c-labelling of (E,E)-1-(3′,4′-dihydroxystyryl)-4-(3′-methoxy-4 ′-hydroxystyryl) benzene for PET imaging of amyloid deposits
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Carboxylic acid derivatives of the amyloid-binding dye Congo red do not enter the brain well and are thus unable to serve as in vivo amyloid-imaging agents. A neutral amyloid probe, (E,E)-1-(3′,4′-dihydroxystyryl)-4-(3′-methoxy-4 ′-hydroxystyryl)benzene (3), devoid of any carboxylate groups has been designed and synthesized via a 12-step reaction sequence with a total yield of 30%. The unsymmetric compound 3 has also been labelled with C-11 via [11C]methyl iodide ([11C]CH3I) methylation of a symmetric 4,4′-dimesyl protected precursor followed by deprotection. Preliminary evaluation indicated that compound 3 selectively stained plaques and neurofibrillary tangles in post-mortem AD brain, and exhibited good binding affinity (Ki = 38 ± 8 nM) for Aβ(1-40) fibrils in vitro. In vivo pharmacokinetic studies indicated that [11C]3 exhibited higher brain uptake than its carboxylic acid analogs and good clearance from normal control mouse brain. [11C]3 also exhibited specific in vivo binding to pancreatic amyloid deposits in the NOR-beta transgenic mouse model. These results justify further investigation of 3 and similar derivatives as surrogate markers for in vivo quantitation of amyloid deposits. Copyright
- Wang, Yanming,Mathis, Chester A.,Huang, Guo-Feng,Holt, Daniel P.,Debnath, Manik L.,Klunk, William E.
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p. 647 - 664
(2007/10/03)
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- Vanilloid and isovanilloid analogues as inhibitors of methionyl-tRNA and isoleucyl-tRNA synthetases
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As aminoacyl adenylate surrogates, a series of methionyl and isoleucyl phenolic analogues containing bioisosteric linkers mimicking ribose have been investigated. Inhibition of synthesized compounds to the aminoacylation reaction by the corresponding Escherichia coli methionyl-tRNA and isoleucyl-tRNA synthetases indicated that 18 was found to be a potent inhibitor of isoleucyl-tRNA synthetase. A molecular modeling study demonstrated that in 18, isovanillate and hydroxamate served as proper surrogates for adenine and ribose in isoleucyl adenylate, respectively.
- Lee, Jeewoo,Kang, Sang Uk,Kim, Su Yeon,Kim, Sung Eun,Jo, Yeong Joon,Kim, Sunghoon
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p. 965 - 968
(2007/10/03)
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- Efficient deprotection of phenol methoxymethyl ethers using a solid acid catalyst with Wells-Dawson structure
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Deprotection of various phenols from their respective methoxymethyl ethers using an heteropolyacid catalyst was studied. The catalyst was the Wells-Dawson heteropolyacid, used both in bulk or supported on silica. Yields were high to quantitative after less than one hour reaction time and the catalyst was easily recoverable and reusable.
- Romanelli,Autino,Baronetti,Thomas
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p. 1006 - 1011
(2007/10/03)
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- Synthesis of the Adrenergic Bronchodilators (R)-Terbutalinel and (R)-Salbutamol from (R)-Cyanohydrins
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Stereoselective syntheses of (R)-terbutaline and (R)-salbutamol acetal, which are important bronchodilators, starting from O-protected (R)-cyanohydrins are described. (R)-Terbutaline hydrochloride (R)-9·HCl is obtained in an overall yield of 44% with >98% ee from the O-bisallyl-protected cyanohydrin (R)-4k via a Ritter N-tertiary butylation to the amide (R)-6a, hydrogenation to the amino alcohol (R)-7a, and deprotection of the hydroxyl functions. (R)-Salbutamol acetals (R)-7b,c can be obtained from the corresponding O-protected (R)-cyanohydrins either via the route described for (R)-terbutaline or via selective hydrogenation of the protected cyanohydrin (R)-11 to the imino derivative, transimination with tert-butylamine, followed by hydrogenation with NaBH4 to give the 2-amino alcohol derivative (R)-12. Desilylation of (A)-12 to (R)-7c is performed with LiAlH4. Hydrolytic cleavage of the acetals (A)-7b and c to (R)-salbutamol was not yet possible without racemization.
- Effenberger, Franz,Jaeger, Juergen
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p. 3867 - 3873
(2007/10/03)
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- Anti-ulcer agent comprising chalcone derivative as effective ingredient and novel chalcone derivative
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The present invention relates to an anti-ulcer agent comprising a compound represented by the following general formula I as the effective ingredient, and a novel chalcone derivative included in the compound represented by this general formula I: STR1 wherein X and Y independently stand for a hydrogen atom or together form a single bond, R1 stands for a hydroxyl group, an acetoxy group, a carboxymethoxy group or a methoxycarbonylmethoxy group, R2 stands for a hydrogen atom, an isoprenyl group, isopentyl group or a propyl group, R3 stands for hydroxyl group or a methoxy group, R4 stands for a hydrogen atom, a hydroxyl group or a methoxy group, R5 stands for a hydrogen atom, a hydroxyl group, a methoxy group or an isopentyl group, R6 stands for a hydroxyl group, a methoxy group or a carboxymethoxy group, and R7 stands for a hydrogen atom or a methoxy group.
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- REGIOSELECTIVE SYNTHESIS OF 7,8-DIOXYGENATED-3,4-DIHYDROISOQUINOLINES BY METALATION OF β-PHENETHYLAMINES
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A new, one-pot procedure for the synthesis of the title compounds is described which is based on the thermodynamic metalation of the corresponding β-(3,4-dialkoxyphenyl)ethylamine.
- Lamas, Carlos,Castedo, Luis,Dominguez, Domingo
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p. 3865 - 3868
(2007/10/02)
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