Syntheses, Structures, and Enzymic Evaluations of Conformationally Constrained, Analog Inhibitors of Carnitine Acetyltransferase: (2R,6R)-, (2S,6S)-, (2R,6S)-, and (2S,6R)-6-(Carboxylatomethyl)-2-(hydroxymethyl)-2,4,4-trimethylmorpholinium
摘要:
The syntheses and structures of the four stereoisomers of 6-(carboxylatomethyl)-2-(hydroxymethyl)- 2,4,4-trimethylmorpholinium, 1, are described. The key step in the synthetic strategy involves an intramolecular Michael addition reaction. Condensation of nonracemic 3-(methylamino)-2-methylpropane-1,2-diol, 3, with methyl 4-bromo-2-butenoate followed by intramolecular Michael addition gives a mixture of two diastereomers of methyl 2-[4,6-dimethyl-6-(hydroxymethyl)morpholinyl]-acetate, 5. The diastereomeric ratio ofthe products in this reaction changes from 6:1 to 1:1 with a change in solvent fi om diethyl ether:methanol (35:1, v:v) to methanol. The structures and absolute configurations of 1 were determined by single crystal X-ray analyses. In crystals and solution, the morpholinium rings adopt a chair conformation with carboxylatomethyl occupying an equatorial position. All four stereoisomers inhibit pigeon breast carnitine acetyltransferase (CAT). Of this series, (2S,6R)-1 binds to CAT most strongly with a Ki of 190 +/- 20 mu M and an IC50 of 0.42 mM. The enzymatic assays of 1 confirm that CAT recognizes both configurations at C2 and C6 in the analogues. CAT has a different conformation when it binds carnitine or acetylcarnitine than when it binds 1. This latter conformation may resemble that when CAT catalyzes acetyl transfer.
Mapping the substrate selectivity of new hydrolases using colorimetric screening: lipases from Bacillus thermocatenulatus and Ophiostoma piliferum, esterases from Pseudomonas fluorescens and Streptomyces diastatochromogenes
作者:Andrew Man Fai Liu、Neil A Somers、Romas J Kazlauskas、Terry S Brush、Frank Zocher、Markus M Enzelberger、Uwe T Bornscheuer、Geoff P Horsman、Alessandra Mezzetti、Claudia Schmidt-Dannert、Rolf D Schmid
DOI:10.1016/s0957-4166(01)00072-6
日期:2001.3
screened a general library of 29 substrates and a chiral library of 23 pairs of enantiomers. All four hydrolases catalysed the hydrolysis of unnatural substrates, but the two lipases accepted a broader range of substrates than the two esterases. As expected, the two lipases favoured more hydrophobic substrates, while the two esterases showed a preference for smaller substrates. Several moderately enantioselective
[EN] C-3 AND C-17 MODIFIED TRITERPENOIDS AS HIV-1 INHIBITORS<br/>[FR] TRITERPÉNOÏDES MODIFIÉS EN C-3 ET C-17 UTILISÉS COMME INHIBITEURS DU VIH-1
申请人:VIIV HEALTHCARE UK (NO 5) LTD
公开号:WO2017134596A1
公开(公告)日:2017-08-10
Compounds having drug and bio-affecting properties, their pharmaceutical compositions and methods of use are set forth. In particular, betulinic acid derivatives that possess unique antiviral activity are provided as HIV maturation inhibitors, as represented by compounds of Formula (I). These compounds are useful for the treatment of HIV and AIDS.
[EN] DIACYLGLYCEROL KINASE MODULATING COMPOUNDS<br/>[FR] COMPOSÉS MODULANT LA DIACYLGLYCÉROL KINASE
申请人:CARNA BIOSCIENCES INC
公开号:WO2021130638A1
公开(公告)日:2021-07-01
The present disclosure provides diacylglycerol kinase modulating compounds, and pharmaceutical compositions thereof, for treating cancer, including solid tumors, and viral infections, such as HIV or hepatitis B virus infection. The compounds can be used alone or in combination with other agents.
Synthesis of new generation triazolyl- and isoxazolyl-containing 6-nitro-2,3-dihydroimidazooxazoles as anti-TB agents: in vitro, structure–activity relationship, pharmacokinetics and in vivo evaluation
作者:Gurunadham Munagala、Kushalava Reddy Yempalla、Samsher Singh、Sumit Sharma、Nitin Pal Kalia、Vikrant Singh Rajput、Sunil Kumar、Sanghapal D. Sawant、Inshad Ali Khan、Ram A. Vishwakarma、Parvinder Pal Singh
DOI:10.1039/c5ob00054h
日期:——
Promising nitroimidazoloxazole scaffold gives another novel triazolyl-containing 6-nitro-2,3-dihydroimidazooxazole as anti-TB lead.