A Short Enantioselective Formal Synthesis of (+)-(S)-4,4-(Ethylenedioxy)-7-hydroxyoct-2-enoic Acid: The Penultimate Precursor to (-)-(R,R)-Pyranophorin
Diesters of carbonic acid endowed with antiviral and anti-inflammatory
申请人:Italfarmaco S.P.A.
公开号:US05827881A1
公开(公告)日:1998-10-27
Diesters of carbonic acid disubstituted with primary, secondary or tertiary amine groups, pharmaceutically acceptable salts thereof, and their use as antiviral and inti-inflammatory agents.
碳酸二取代基的二酯,其与一级、二级或三级胺基形成的药用盐,以及它们作为抗病毒和抗炎药物的用途。
A [3+2]nitrile oxide cycloaddition approach to (−)-pyrenophorin, and rosefuran
作者:Achille Barco、Simonetta Benetti、Carmela De Risi、Gian P. Pollini、Vinicio Zanirato
DOI:10.1016/0040-4020(95)00392-l
日期:1995.7
been conveniently applied as carbon-carbon bond forming reaction for the assemblage of the functionalized carbon atom fragments required for the synthesis of two simple but different targets such as the macrolide antibiotic (−)-pyrenophorin 1 and rosefuran 2, a trace component of the high prized oil of rose. In both cases, an intermediate 3,5-disustituted isoxazoline ring system has been used as serviceable
A Mild, Efficient, and Selective Method for the Desilylation of More Common Trialkylsilyl Ethers by Cerium(III) Chloride Heptahydrate and Sodium Iodide in Acetonitrile
Treatment of trialkylsilyl ethers with cerium(III) chloride heptahydrate and sodium iodide in acetonitrile provides a simple, convenient, and chemoselective process for desilylation, and the parent alcohol was obtained in high yield. The trialkylsilyl ethers have been cleaved selectively in the presence of acetate, benzyl and tetrahydropyranyl ethers.
A Stereochemical Probe of the Tetrahedral Intermediate in the Reactions of Acetyl-Coenzyme A Dependent Acetyltransferases
作者:Benjamin Schwartz、Dale G. Drueckhammer
DOI:10.1021/ja9616241
日期:1996.1.1
mimic the two possible configurations of the tetrahedral intermediate or transition state in the reactions of acetyl-CoA dependent acetyltransferases. These two isomers were tested as inhibitors of chloramphenicol acetyltransferase and carnitine acetyltransferase, both of which have previously been predicted to form a tetrahedral intermediate which matches the configuration of the (S)-alcohol. The (S)-isomer
已经制备了一对异构乙酰辅酶 A(乙酰辅酶 A)类似物,其中硫酯基团被仲醇取代。这两种异构体在仲醇的立体构型方面不同,旨在模拟乙酰辅酶 A 依赖性乙酰转移酶反应中四面体中间体或过渡态的两种可能构型。测试这两种异构体作为氯霉素乙酰转移酶和肉碱乙酰转移酶的抑制剂,这两种酶先前已被预测形成与 (S)-醇的构型匹配的四面体中间体。(S)-异构体是两种酶的更有效抑制剂,其 Ki 值比 (R)-异构体的 Ki 值低 12 倍和 6 倍。(S)-异构体也是更有效的磷酸乙酰转移酶抑制剂,乙酰辅酶A合成酶和芳胺乙酰转移酶,其四面体中间体的立体化学以前未知。这些结果表明...
Baker's yeast reduction of prochiral γ-nitroketones: Enantioselective synthesis of (S)-4-nitroalcohols
作者:Antonio Guarna、Ernesto G. Occhiato、Laura M. Spinetti、Maria E. Vallecchi、Dina Scarpi
DOI:10.1016/0040-4020(94)01056-6
日期:1995.2
The baker'syeastreduction of seven different prochiral nitroketones 1a-g occurred on the re face of the carbonyl group, thus affording the (S)-nitroalcohols 2a-g, with different level of enantioselectivity (e.e. 15–99%). The best results (e.e. = 99%) were achieved when the substituent R is markedly different from the nitroalkyl group [e.g. 1a (R = Me) and 1e (R = o-MeO-C6H4)]. The e.e. and the configuration
Baker的七个不同的前手性硝基酮酵母还原1A-G上发生了重新羰基的面,由此提供第(小号)-nitroalcohols 2A-G ,具有不同水平的对映选择性(EE 15-99%)。当取代基R与硝基烷基显着不同时(例如1a(R = Me)和1e(R = o -MeO-C 6 H 4)),可获得最佳结果(ee = 99%)。通过相应的Mosher酯的NMR研究确定了生物产物的ee和构型,在一种情况下(2d)的化学相关性。还描述了从2d开始的光学活性内酯7和吡咯烷11的合成。