Lindsay Smith, John R.; Nagatomi, Eiji; Waddington, David J., Journal of the Chemical Society. Perkin Transactions 2 (2001), 2000, # 11, p. 2248 - 2258
Reduction of ketones with a reductant, 2-alkanol, by the acetonepowder of Geotrichumcandidum affords the corresponding (S)-alcohols of excellent ee in high yield.
Bakers’ yeast reduces esters of 2-alkyl-3-oxobutanoic acid (CH3COCHRCO2R′; R=methyl, ethyl, propyl, propargyl, and allyl) into the corresponding (S)-hydroxy esters with exclusive stereoselectivity, while the configuration at the 2-position of the hydroxy esters is either S (anti) or R (syn) depending on the structure of the alkoxyl group in the carboalkoxyl moiety of the ester. Oftenly, the stereoselectivity
Catalytic Asymmetric Transfer Hydrogenation of α-Ketoesters with Hantzsch Esters
作者:Jung Woon Yang、Benjamin List
DOI:10.1021/ol0624373
日期:2006.11.1
C2-symmetric chiral copper(II)-bisoxazolines function as alcohol dehydrogenase mimics and catalyze highly enantioselective transferhydrogenations of alpha-ketoesters with Hantzsch esters as a synthetic NADH analogue to give alpha-hydroxy esters in excellent enantioselectivities. [reaction: see text].
Sila-substituted 1,4-dihydropyridine derivatives and their medicinal use
申请人:Bayer Aktiengesellschaft
公开号:US04237137A1
公开(公告)日:1980-12-02
The invention provides sila-substituted 1,4-dihydropyridine derivatives useful as medicament which influence the circulation. Also included in the invention are methods for the procurement of said derivatives, compositions containing said derivatives and methods for the use of said derivatives.
Sila-Pharmaka, 24. Mitt. [1]. Sila-Analoga von Nifedipin-ähnlichen 4-Aryl-2.6-dimethyl-1.4-dihydropyridin- 3.5-dicarbonsäure-dialkylestern, II. / Sila-Drugs, 24<sup>th</sup> Communication [1]. Sila-Analogues of Nifedipine-Like Dialkyl 4-Aryl-2,6-dimethyl-1,4-dihydropyridine- 3,5-dicarboxylates, II.
作者:R. Tacke、A. Bentlage、W. S. Sheldrick、L. Ernst、R. Towart、K. Stoepel
DOI:10.1515/znb-1982-0410
日期:1982.4.1
In the course of systematic studies on sila-substituted drugs the nifedipine-like 1.4-dihydropyridine derivatives 4a, 4b and 4c were prepared and investigated with respect to sila-substitution effects. By X-ray diffraction analyses 4a, 4b and 4c were found to be isostructural. The C/Si-analogues exhibit similar spasmolytic activities (in vitro, guinea pig ileum), comparable with that of nifedipine
在对 sila 取代药物的系统研究过程中,制备了类似硝苯地平的 1.4-二氢吡啶衍生物 4a、4b 和 4c,并研究了 sila 取代效应。通过 X 射线衍射分析发现 4a、4b 和 4c 是同构的。C/Si 类似物表现出与硝苯地平相似的解痉活性(体外,豚鼠回肠)。然而,如通过对肾性高血压大鼠的抗高血压作用所测量的,这些化合物的体内活性显着不同。关于碳/硅交换讨论了实验结果。