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
rac-trans-haloalkyl epoxides 1a−8a using the epoxide hydrolase activity of whole bacterial cells furnished the corresponding vicinal diols 1b−8b as intermediates; these (spontaneously) underwent ring closure to yield cyclic products 1c−6c through an enzyme-triggered cascade reaction. In particular, cis-configured substrates (1a, 3a, 5a, 7a) were transformed in an enantioconvergent fashion, which resulted
使用整个细菌细胞的环氧水解酶活性对 2,3-二取代外消旋-顺-和外消旋-反-卤代烷基环氧化物 1a-8a 进行生物催化水解,得到相应的邻位二醇 1b-8b 作为中间体;这些(自发地)经历闭环以通过酶触发的级联反应产生环状产物 1c-6c。特别是,顺式构型的底物(1a、3a、5a、7a)以对映收敛方式转化,导致从外消旋体中形成 100% des 和高达 92% ees 的单一立体异构产物。
Method for Preparing Ibrutinib
申请人:SUZHOU MIRACPHARMA TECHNOLOGY CO., LTD.
公开号:US20160264584A1
公开(公告)日:2016-09-15
Provided is a method for preparing Ibrutibin (I), and steps of preparing same comprise: 4-benzyloxybenzoyl chloride (II) is used as a raw material, condensation and methoxidation reactions occur among 4-benzyloxybenzoyl chloride (II), malononitrile, and dimethyl sulfate to generate 4-benzyloxyphenyl(methoxy)vinylidenedicyanomethane (III), pyrazole cyclization occurs between the intermediate (III) and 1-(3R-hydrazino-1-piperidino)-2-propylene-1-ketone (IV) to acquire 1-[(3R)-[3-(4-benzyloxyphenyl)-4-nitrile-5 -amino-1H-pyrazole]-1-piperidino]-2 propylene-1-ketone (V), and pyrimidine cyclization occurs between an intermediate (V) and a cyclizing agent to prepare Ibrutinib (I). In the preparation method, the raw material is readily available, and the process is simple, economical, environmentally friendly, and is suitable for industrial production.