Asymmetric reduction of ketones by Geotrichum candidum in the presence of AmberliteTM XAD, a solid organic solvent
作者:Kaoru Nakamura、Mikio Fujii、Yoshiteru Ida
DOI:10.1039/b005204n
日期:——
A hydrophobic polymer, Amberlite™ XAD, was used as material to control the stereochemical course of microbial reductions. In the presence of XAD, simple aliphatic and aromatic ketones were reduced to the corresponding (S)-alcohols in excellent enantiomeric excess (ee) while low enantioselectivities were observed in the absence of the polymer.
Racemization in combination with a kineticresolution is the base for a dynamic kineticresolution (DKR). Biocatalytic racemization was successfully performed for a broad scope of sec‐alcohols by employing a single alcohol dehydrogenase (ADH) variant from Thermoanaerobacter pseudoethanolicus (formerly T. ethanolicus; TeSADH W110A I86A C295A). The catalyst employed as a lyophilized whole cell preparation
Asymmetric diethylzinc addition and phenyl transfer to aldehydes using chiral cis-cyclopropane-based amino alcohols
作者:Jiangchun Zhong、Hongchao Guo、Mingan Wang、Mingming Yin、Min Wang
DOI:10.1016/j.tetasy.2007.03.006
日期:2007.4
A new series of aminoalcohols with a chiral cyclopropane backbone have been developed and used in the catalytic asymmetric diethylzinc addition and phenyl transfer to various types of aldehydes. These cyclopropane-based chiral aminoalcohols show high enantioselectivity in the addition of organozincs to aromatic and aliphatic aldehydes. For diethylzinc addition to aromatic and aliphatic aldehydes
Convergent Catalytic Asymmetric Synthesis of Esters of Chiral Dialkyl Carbinols
作者:Ze-Peng Yang、Gregory C. Fu
DOI:10.1021/jacs.0c01324
日期:2020.3.25
Because chiral dialkyl carbinols, as well as their derived esters, are significant as intermediates and end points in fields such as organic, pharmaceutical, and biological chemistry, the development of efficient approaches to their asymmetric synthesis is an important endeavor. In this report, we describe a method for the direct catalytic enantioselective synthesis of such esters, beginning with an
The substratespectrum of the inverting alkylsulfatase Pisa1 was investigated using a range of sec‐alkyl sulfate esters bearing aromatic, olefinic and acetylenic moieties. Perfect enantioselectivities were obtained for substrates bearing groups of different size adjacent to the sulfate ester moiety. Insufficient selectivities could be doubled by using dimethyl sulfoxide (DMSO) as co‐solvent. Hydrolytically