3-羟基戊酸甲酯 在
air 、 cells of Geotrichum candidum IFO 5767 作用下,
以
水 为溶剂,
反应 24.0h,
以48%的产率得到(-)-(R)-3-羟基戊酸甲酯
参考文献:
名称:
Stereoinversion of arylethanols by Geotrichum candidum
摘要:
Aromatic and aliphatic racemic alcohols were converted to the corresponding optically active alcohols in high yield with excellent enantioselectivities by the use of Geotrichum candidum IFO 5767. (C) 2002 Elsevier Science Ltd. All rights reserved.
Over 98% Optical Yield Achieved by a Heterogeneous Catalysis. Substrate Design and Analysis of Enantio-Differentiating Factors of Tartaric Acid-Modified Raney Nickel Hydrogenation
Reduction of aromatic and aliphatic keto esters using sodium borohydride/MeOH at room temperature: a thorough investigation
作者:Juryoung Kim、Kathlia A. De Castro、Minkyung Lim、Hakjune Rhee
DOI:10.1016/j.tet.2010.04.062
日期:2010.6
Reduction of keto esters is a valuable alternative to produce diols. Sodiumborohydride/MeOH system at room temperature and short reaction time efficiently reduced α, β, γ, and δ-keto esters having α-keto esters as the most reactive. The ester functionality was reduced effectively due to the presence of oxo group that somehow facilitates the formation of ring intermediate. As expected, the chemoselective
Chiral C2-symmetric biphenyls, their preparation and also metal complexes in which these ligands are present and their use as catalysts in chirogenic syntheses
申请人:Peschko Christian
公开号:US20050250951A1
公开(公告)日:2005-11-10
A new class of C
2
-symmetric biaryldiphosphines comprising a fused ring system (dioxacycle) which has at least seven ring atoms and can be varied synthetically. The biaryldiphosphines can be used as ligands for preparing metal complexes useful as catalysts in organic synthesis, and the dioxacycles can be varied to optimize reaction with specific substrates.
[EN] SUBSTITUTED AMINOPIPERIDINES AS DIPEPTIDYL PEPTIDASE-IV INHIBITORS FOR THE TREATMENT OF DIABETES<br/>[FR] AMINOPIPÉRIDINES SUBSTITUÉES UTILISÉES EN TANT QU'INHIBITEURS DE LA DIPEPTIDYL PEPTIDASE-IV DANS LE CADRE DU TRAITEMENT DU DIABÈTE
申请人:MERCK SHARP & DOHME
公开号:WO2011037793A1
公开(公告)日:2011-03-31
The present invention is directed to novel substituted aminopiperidines of structural formula I which are inhibitors of the dipeptidyl peptidase-IV enzyme and which are useful in the treatment or prevention of diseases in which the dipeptidyl peptidase-ΪV enzyme is involved, such as diabetes and particularly Type 2 diabetes. The invention is also directed to pharmaceutical compositions comprising these compounds and the use of these compounds and compositions in the prevention or treatment of such diseases in which the dipeptidyl peptidase-IV enzyme is involved.
[EN] ANELLATED PYRIDINE COMPOUNDS AS DUAL MODULATORS OF THE 5-HT2A AND D3 RECEPTORS<br/>[FR] COMPOSÉS PYRIDINIQUES ANNELÉS COMME MODULATEURS DUAUX DES RÉCEPTEURS 5-HT2A ET D3
申请人:HOFFMANN LA ROCHE
公开号:WO2011161009A1
公开(公告)日:2011-12-29
The present invention is concerned with novel dual modulators of the 5-HT2A and D3 receptors of formula (I) wherein X, Y, A, R1, R2, and R3 are as described herein, as well as pharmaceutically acceptable salts and esters thereof. Further the present invention is concerned with the manufacture of the compounds of formula (I), pharmaceutical compositions comprising them and their use as medicaments.
heterogeneous catalyst exhibits advantages over its homogeneous counterpart in the synthesis of β-hydroxyesters from epoxides. However, leaching of cobaltate from the catalytic support decreases the selectivity and recyclability of the catalyst. To overcome such drawbacks, a bis-imidazolium-based covalenttriazineframework (CTF) is employed as a catalytic support for the hydroesterification catalyst to reduce