- Preorganized helical chirality controlled homochiral self-assembly and circularly polarized luminescence of a quadruple-stranded Eu2 L 4 helicate
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β-Diketones are one of the most widely used ligands for sensitizing the luminescence of lanthanide complexes due to their excellent sensitization abilities. However, the difficulties in introducing chiral groups to take part in the electronic transitions of conjugated systems limit their application in lanthanide circularly polarized luminescence (CPL) materials. In view of the inherent chirality of the helical structure, herein, a pair of homochiral quadruple-stranded helicates, Eu2L4, is assembled based on chiral bis-β-diketonate ligands, wherein the two point chirality centers in the spacer preorganize the helical conformation of the ligand (3S,4S)/(3R,4R)-3,4-bis(4,4′-bis(4,4,4-trifluoro-1,3-dioxobutyl)phenoxyl)-1-benzylpyrrolidine, LSS/LRR. X-ray crystallographic analyses reveal that the R,R configurations of the chiral carbons in the spacer induce the M helical sense of the ligand, while the S,S configurations induce the P helical sense. Through the comprehensive spectral characterization in combination with semiempirical geometry optimization using the Sparkle/RM1 model, it is confirmed that the preorganized ligands successfully control the homochirality of the helicates. Moreover, the mirror-image CD and CPL spectra and NMR measurements confirm the formation of enantiomeric pairs and their diastereopurities in solution. Detailed photophysical and chiroptical characterization studies reveal that the helicates not only exhibit intense circularly polarized luminescence (CPL) with |glum| values reaching 0.10, but also show a high luminescence quantum yield of 34%. This study effectively combines the helical chirality of the helicates with the excellent sensitization ability of the β-diketones, providing an effective strategy for the syntheses of chiral lanthanide CPL materials.
- Cheng, Zhenyu,Gao, Ting,Han, Guoying,Li, Hongfeng,Yan, Pengfei,Yao, Yuan,Zhou, Yanyan
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Read Online
- Synthesis and α-glucosidase inhibition activity of dihydroxy pyrrolidines
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A new series of Deacetylsarmentamide A and B derivatives, amides and sulfonamides of 3,4-dihydroxypyrrolidines as α-glucosidase inhibitors were designed and synthesized. The biological screening test against α-glucosidase showed that some of these compounds have the positive inhibitory activity against α-glucosidase. Saturated aliphatic amides were more potent than the olefinic amides. Among all the compounds, 5o/6o having polar –NH2 group, 10f/11f having polar –OH group on phenyl ring displayed 3–4-fold more potent than the standard drugs. Acarbose, Voglibose and Miglitol were used as standard references. The promising compounds 6i, 5o, 6o, 10a, 11a, 10f and 11f have been identified. Molecular docking simulations were done for compounds to identify important binding modes responsible for inhibition activity of α-glucosidase.
- Kasturi, Sivaprasad,Surarapu, Sujatha,Uppalanchi, Srinivas,Anireddy, Jaya Shree,Dwivedi, Shubham,Anantaraju, Hasitha Shilpa,Perumal, Yogeeswari,Sigalapalli, Dilep Kumar,Babu, Bathini Nagendra,Ethiraj, Krishna S.
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p. 2818 - 2823
(2017/05/29)
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- PYRAZOLO[1,5-A]PYRIMIDINE-5,7-DIAMINE COMPOUNDS AS CDK INHIBITORS AND THEIR THERAPEUTIC USE
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The present invention pertains generally to the field of therapeutic compounds. More specifically the present invention pertains to certain pyrazolo[1,5-a]pyrimidine-5,7- diamine compounds (referred to herein as "PPDA compounds") that, inter alia, inhibit (e.g., selectively inhibit) CDK (e.g., CDK1, CDK2, CDK4, CDK5, CDK6, CDK7, CDK8, CDK9, CDK10, CDK11, CDK12, CDK13, etc.). The present invention also pertains to pharmaceutical compositions comprising such compounds, and the use of such compounds and compositions, both in vitro and in vivo, to inhibit CDK; and to treat disorders including: disorders that are associated with CDK; disorders that result from an inappropriate activity of a cyclin-dependent kinase (CDK); disorders that are associated with CDK mutation; disorders that are associated with CDK overexpression; disorders that are associated with upstream pathway activation of CDK; disorders that are ameliorated by the inhibition of CDK; proliferative disorders; cancer; viral infections (including HIV); neurodegenerative disorders (including Alzheimer's disease and Parkinson's disease); ischaemia; renal diseases; and cardiovascular disorders (including atherosclerosis). Optionally, the treatment further comprises treatment (e.g., simultaneous or sequential treatment) with a further active agent which is, e.g., an aromatase inhibitor, an anti-estrogen, a Her2 blocker, a cytotoxic chemotherapeutic agent, etc.
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Page/Page column 87; 88
(2015/09/28)
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- Exocyclic deoxyadenosine adducts of 1,2,3,4-diepoxybutane: Synthesis, structural elucidation, and mechanistic studies
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1,2,3,4-Diepoxybutane (DEB) is considered the ultimate carcinogenic metabolite of 1,3-butadiene, an important industrial chemical and environmental pollutant present in urban air. Although it preferentially modifies guanine within DNA, DEB induces a large number of A → T transversions, suggesting that it forms strongly mispairing lesions at adenine nucleobases. We now report the discovery of three potentially mispairing exocyclic adenine lesions of DEB: N6,N6-(2,3-dihydroxybutan-1,4-diyl)-2′- deoxyadenosine (compound 2), 1,N6-(2-hydroxy-3-hydroxymethylpropan-1, 3-diyl) -2′-deoxyadenosine (compound 3), and 1,N6-(1- hydroxymethyl-2-hydroxypropan-1,3-diyl)-2′-deoxyadenosine (compound 4). The structures and stereochemistry of the novel DEB-dA adducts were determined by a combination of UV and NMR spectroscopy, tandem mass spectrometry, and independent synthesis. We found that synthetic N6-(2-hydroxy-3,4- epoxybut-1-yl)-2′-deoxyadenosine (compound 1) representing the product of N6-adenine alkylation by DEB spontaneously cyclizes to form 3 under aqueous conditions or 2 under anhydrous conditions in the presence of an organic base. Compound 3 can be interconverted with 4 by a reversible unimolecular pericyclic reaction favoring 4 as a more thermodynamically stable product. Both 3 and 4 are present in double stranded DNA treated with DEB in vitro and in liver DNA of laboratory mice exposed to 1,3-butadiene by inhalation. We propose that in DNA under physiological conditions, DEB alkylates the N-1 position of adenine in DNA to form N1-(2-hydroxy-3,4-epoxybut-1-yl)-adenine adducts, which undergo an SN2-type intramolecular nucleophilic substitution and rearrangement to give 3 (minor) and 4 (major). Formation of exocyclic DEB-adenine lesions following exposure to 1,3-butadiene provides a possible mechanism of mutagenesis at the A:T base pairs.
- Seneviratne, Uthpala,Antsypovich, Sergey,Goggin, Melissa,Dorr, Danae Quirk,Guza, Rebecca,Moser, Adam,Thompson, Carrie,York, Darrin M.,Tretyakova, Natalia
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scheme or table
p. 118 - 133
(2011/02/16)
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- The synthesis and biological evaluation of a novel series of C7 non-basic substituted fluoroquinolones as antibacterial agents
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A series of non-basic building blocks was synthesized and introduced to the C7 position of the quinolone nucleus 7-chloro-1-cyclopropyl-6-fluoro-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carboxylic acid to afford the corresponding fluoroquinolones in 46-85% yield. The antibacterial activity of these new fluoroquinolones was evaluated using a standard broth microdilution technique. The sulfur-containing quinolone, 7-(2-thia-5-azabicyclo[2.2.1]heptan-5-yl)-1-cyclopropyl-6-fluoro-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carboxylic acid exhibited a superior antibacterial activity against quinolone-susceptible and multidrug-resistant strains in comparison with the clinically used fluoroquinolones ciprofloxacin and vancomycin, especially to the Streptococcus pneumonia and multidrug-resistant S. pneumonia clinical isolates. Crown Copyright
- Huang, Xiaoguang,Chen, Dongliang,Wu, Ning,Zhang, Aiqin,Jia, Zhenhua,Li, Xingshu
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scheme or table
p. 4130 - 4133
(2010/04/26)
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- Synthesis of an ovoid chiral cage
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Evidence for the formation of an ovoid chiral cage, resulting from the auto-assembly of two hexafunctional and three tetrafunctional modules reacting through dynamic covalent bond formation, is provided. Georg Thieme Verlag Stuttgart.
- Couty, Fran?ois,David, Olivier R. P.
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scheme or table
p. 1945 - 1948
(2010/04/05)
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- Structure-guided design of C2-symmetric HIV-1 protease inhibitors based on a pyrrolidine scaffold
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Infections with the human immunodeficiency virus, which inevitably lead to the development of AIDS, are still among the most serious global health problems causing more than 2.5 million deaths per year. In the pathophysiological processes of this pandemic
- Blum, Andreas,B?ttcher, Jark,Heine, Andreas,Klebe, Gerhard,Diederich, Wibke E.
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p. 2078 - 2087
(2008/12/22)
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- VLA-4 INHIBITORY DRUG
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There is provided a VLA-4 inhibitory drug having good oral absorbability and exhibiting sufficient anti-inflammatory effects when administered orally. A compound represented by the following formula (I): wherein R1 represents a hydrogen atom or a C1-8 alkyl group; R2 represents a hydrogen atom, a halogen atom, a C1-8 alkoxy group, orabenzyloxygroupwhichmaybe substituted; Q represents a monocyclic or bicyclic nitrogen-containing heterocyclic group which may be substituted, and has a nitrogen atom as the bonding site; Y represents an oxygen atom or CH2; W represents a bicyclic aromatic hydrocarbon ring group which may be substituted, or a bicyclic aromatic heterocyclic group whichmaybe substituted; R3a, R3b and R3c each independently represent a hydrogen atom, a halogen atom, a C1-8 alkoxy group or a C1-8 alkyl group; and A1 represents a nitrogen atom or C-R3d (wherein R3d represents a hydrogen atom, a halogen atom, a C1-8 alkoxy group or a C1-8 alkyl group), or a salt thereof, or a VLA-4 inhibitory drug comprising the compound or the salt as an active ingredient.
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Page/Page column 122
(2008/12/08)
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- Synthesis of diastereomeric 3-hydroxy-4-pyrrolidinyl derivatives of nucleobases
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The work deals with the synthesis of hydroxypyrrolidine analogs of nucleosides. Starting from the optically pure l- or d-tartaric acid, we improved the synthesis of enantiomeric trans-3,4-dihydroxypyrrolidines and elaborated a procedure for the synthesis of all possible diastereoisomers of 3-hydroxy-4-pyrrolidinyl derivatives of both purine and pyrimidine nucleobases. The prepared compounds were tested for cytostatic and antiviral properties but no significant activity was found.
- Rejman, Dominik,Ko?alka, Petr,Budě?ínsky, Milo?,Pohl, Radek,Rosenberg, Ivan
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p. 1243 - 1253
(2007/10/03)
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- Substituted 3-Amino-Pyrrolidino-4-Lactams
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The invention provides compounds of formula (1), and the pharmaceutically acceptable salt thereof, wherein R1, n and R2 are as described herein; compositions thereof; and uses thereof.
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Page/Page column 11; 14
(2008/06/13)
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- Novel steroid mimics directed towards the estradiol skeleton
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A series of non-symmetrical tri- and tetra-substituted ureas have been prepared to mimic the rigid tetracyclic core of estradiol. Tetra-substituted ureas were prepared by a five-step protocol, involving activation and displacement of a carbonyldiimidazole
- Bridgeman, Eve,Cavill, Julie L.,Schofield, Daniel J.,Wilkins, Derek S.,Tomkinson, Nicholas C. O.
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p. 8521 - 8524
(2007/10/03)
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- Fluoropyrrolidine amides as dipeptidyl peptidase IV inhibitors
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Amides derived from fluorinated pyrrolidines and 4-substituted cyclohexylglycine analogues have been prepared and evaluated as inhibitors of dipeptidyl dipeptidase IV (DP-IV). Analogues which incorporated (S)-3-fluoropyrrolidine showed good selectivity for DP-IV over quiescent cell proline dipeptidase (QPP). Compound 48 had good pharmacokinetic properties and was orally active in an oral glucose tolerance test in lean mice.
- Caldwell, Charles G.,Chen, Ping,He, Jiafang,Parmee, Emma R.,Leiting, Barbara,Marsilio, Frank,Patel, Reshma A.,Wu, Joseph K.,Eiermann, George J.,Petrov, Aleksandr,He, Huaibing,Lyons, Kathryn A.,Thornberry, Nancy A.,Weber, Ann E.
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p. 1265 - 1268
(2007/10/03)
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- Combinatorial chemistry for ligand development in catalysis: Synthesis and catalysis screening of peptidosulfonamide tweezers on the solid phase
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On the basis of a pyrrolidine tweezer 1, a library of peptidosulfonamide tweezers (15a-e, 16a-e was synthesized on the solid phase. This library was screened in a simultaneous substrate screening procedure for the ability to enantioselectively catalyze the Ti(O-i-Pr)4-mediated addition of diethylzinc to aldehydes. One of the best solid-phase tweezer catalyst (i.e., 16d, giving an ee of 32% in solid-phase catalysis) was resynthesized in solution (compounds 20 and 21). The now homogeneous solution-phase catalysis showed even better enantioselectivity (i.e., up to 66%).
- Brouwer, Arwin J.,van Der Linden, Heiko J.,Liskamp, Rob M. J.
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p. 1750 - 1757
(2007/10/03)
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- Preparation of 14C-labelled 1,4-dideoxy-1,4-imino-D-arabinitol: Cyanosilylation of cyclic imines using KCN in a one-pot synthesis
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A new method for C-C bond formation was developed based on in situ cyanosilylation of cyclic Schiff bases using KCN, TMSCl, KI and ZnI2. This method was used to prepare the potent α-glucosidase inhibitor 1,4-dideoxy-1,4-imino-D-arabinitol
- Folkersen, Birgitte M.,Lundt, Inge,Foged, Christian,Valsborg, Jacob S.
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p. 1145 - 1159
(2007/10/03)
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- Synthesis and biological evaluation of novel 1β-methylcarbapenems having a new moiety at C-2
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The synthesis and biological activity of the novel series of 1β- methylcarbapenems 1a-f, bearing a variety of 3'',4''-disubstituted pyrrolidinamides as substituents at C-2, are described. Of these carbapenems, diol 1a showed the most potent and well balanced antibacterial activity against Gram-positive and Gram-negative, 1a was also evaluated for pharmacokinetics and in vivo therapeutic efficacy in systemic infections.
- Kang, Yong Koo,Shin, Kye Jung,Yoo, Kyung Ho,Seo, Kyung Jae,Park, Seung Yong,Kim, Dong Jin,Park, Sang Woo
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p. 2385 - 2390
(2007/10/03)
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- Pyrrolidine compounds useful in the treatment of diabetes
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The present invention relates to novel pyrrolidine compounds having the general formula I STR1 and pharmaceutically acceptable acid addition salts or hydrates or prodrugs thereof, wherein R1 is straight or branched C1-14 -alkyl optio
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- Synthesis of C2 symmetric primary vicinal diamines. Double stereospecific Mitsunobu reaction of the heterocyclic diols derived from tartaric acid
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Homochiral 1-alkyl-3,4-dihydroxypyrrolidines, (S,S)- and (R,R)-5 were obtained by cyclization and reduction of both enantiomers of (+)- and (-)-tartaric acid, respectively. Also (S,S)-3,4-dihydroxytetrahydrofurane 6 was prepared from (+)-diethyl tartrate. All these heterocyclic vic-diols underwent twofold Mitsunobu reaction (Ph3P/DEA/HN3) followed by catalytic hydrogenation forming stereospecifically the corresponding primary vicinal diamines (R,R)-, (S,S)-2 and (R,R)-3. The absolute configuration of diamines 2, 3 was established by the exciton-coupling CD spectra of their N,N'-diphthaloyl derivatives.
- Skarzewski, Jacek,Gupta, Anil
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p. 1861 - 1867
(2007/10/03)
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- Enantioselective Catalysis, 4. Synthesis of N-Substituted (R,R)-3,4-Bis(diphenylphosphino)pyrrolidines. The Use of their Rhodium Complexes for the Asymmetric Hydrogenation of α-(Acylamino)acrylic Acid Derivatives
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A simple synthesis of (R,R)-3,4-bis(diphenylphosphino)pyrrolidine (6a) and some N-substituted derivatives 6b-m is described. 6l and 6m are optically active tetraphosphanes, composed of two (R,R)-3,4-bis(diphenylphosphino)pyrrolidine units and a dicarboxylic residue.The structure of the parent compound 6a was determined by X-ray diffraction.From the phosphanes 6a-m the cationic 1,5-cyclooctadiene-bisphosphane-rhodium complexes 7a-m were prepared.The complexes 7l and 7m are ligand bridged bis(rhodium) dications.The complexes 7a-m were used for the asymmetric catalytic hydrogenation of the α-(acylamino)acrylic acid derivatives 9a-l.Enantiomeric excesses up to 100percent were achieved.Between 1 and 70 at the optical yields do not depend on the hydrogen pressure.The substrate/catalyst ratio can be as high as 50000/1.
- Nagel, Ulrich,Kinzel, Elke,Andrade, Juan,Prescher, Guenter
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p. 3326 - 3343
(2007/10/02)
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