Stereoselective synthesis of optically active pyridyl alcohols via asymmetric transfer hydrogenation of pyridyl ketones
作者:Kazuya Okano、Kunihiko Murata、Takao Ikariya
DOI:10.1016/s0040-4039(00)01695-6
日期:2000.11
A chiral Ru(II) complex, RuCl[(S,S)-N-(p-toluenesulfonyl)-1,2-diphenyl-ethylenediamine](p-cymene), serves as an efficient catalyst for asymmetric transfer hydrogenation of 2-acetylpyridine with a substrate to catalyst molar ratio of 200–1000 with HCOOH as a hydrogen source to give (S)-1-(2-pyridyl)ethanol in an almost quantitative yield and with 95% ee.
Preparative access to medicinal chemistry related chiral alcohols using carbonyl reductase technology
作者:Andrew S. Rowan、Thomas S. Moody、Roger M. Howard、Toby J. Underwood、Iain R. Miskelly、Yanan He、Bo Wang
DOI:10.1016/j.tetasy.2013.09.015
日期:2013.11
Libraries of highly enantioenriched secondary alcohols in both enantiomeric forms were synthesised by enzymatic reduction of their parent ketones using selectAZyme (TM) carbonyl reductase (CRED) technology. Commercially available CREDs were able to reduce a range of substrate classes efficiently and with very high enantioselectivity. Matching substrate classes to small subsets of CREDs enabled the fast development of preparative bioreductions and the rapid generation of 100-1500 mg samples of chiral alcohols in typically >95% ee and the majority in >= 99.0% ee. The conditions for small scale synthesis were then scaled up to 0.5 kg to deliver one of the chiral alcohols, (S)-1-(4-bromophenyl)-2-chloroethanol, in 99.8% ee and 91% isolated yield. (C) 2013 Elsevier Ltd. All rights reserved.