Dynamic reductive kinetic resolutions of racemic 3‐arylalkanones have been performed by the proper combination of an alcohol dehydrogenase and a basic anionic resin. The best results were found for the bioreduction with the alcohol dehydrogenase type A from Rhodococcus ruber DSM 44541 overexpressed in Escherichia coli (E. coli/ADH‐A) and the commercially available evo‐1.1.200, while the Amberlite IRA‐440
外消旋3-芳基链烷酮的动态还原动力学拆分已通过适当地结合使用醇脱氢酶和碱性阴离子树脂来实现。对于在大肠杆菌(E.coli / ADH-A)和市售evo-1.1.200中过表达的红球菌DSM 44541中的A型醇脱氢酶进行生物还原,发现了最佳结果,而Amberlite IRA-440 C和Amberlite IRA-440 C DOWEX‐MWA-1树脂可实现高效的原位外消旋。根据酶的来源和负载量,树脂的类型和数量,pH,温度和反应时间对反应条件进行了优化,获得了一系列(R,R)取代的propan-2-ols,具有良好的转化率以及非对映选择性和立体选择性。作为概念证明,随后对选定的propan-2-ol底物进行分子内环化,可得到有价值的异色满杂环,而不会损失光学纯度。
Production of optically pure organoboranes
申请人:Aldrich Chemical Company, Inc.
公开号:EP0188235A2
公开(公告)日:1986-07-23
A process for upgrading to essentially 100% enantiomeric excess the optical purity of an organoborane intermediate represented by the formulae:
wherein Icp is isopinocampheyl and R* is a unsubstituted or substituted, acyclic or cyclic alkyl having from 4 to 30 carbon atoms, comprising the steps of hydroborating cis- alkene, a trans-alkene or a tertiary-alkene with monoisopinocampheylborane or diisopinocampheylborane, obtaining a solid organoborane and recrystallizing the solid organoborane to obtain an enantiomeric excess of essentially 100% ee of said organoborane.
Studies in Stereochemistry. VIII. Molecular Rearrangements During Lithium Aluminum Hydride Reductions in the 3-Phenyl-2-pentanol and 2-Phenyl-3-pentanol Systems<sup>1</sup>
作者:Donald J. Cram
DOI:10.1021/ja01129a004
日期:1952.5
Studies in Stereochemistry. X. The Rule of “Steric Control of Asymmetric Induction” in the Syntheses of Acyclic Systems
作者:Donald J. Cram、Fathy Ahmed Abd Elhafez
DOI:10.1021/ja01143a007
日期:1952.12
Hydroboration. 62. Monoisopinocampheylborane; an excellent chiral hydroborating agent for trans-disubstituted and trisubstituted alkenes. Evidence for a strong steric dependence in such asymmetric hydroborations
作者:Herbert C. Brown、Prabhakar K. Jadhav、Arun K. Mandal