Oxazaborolidine-mediated asymmetric reduction of 1,2-diaryl-2-benzyloxyiminoethanones and 1,2-diarylethanediones
摘要:
Highly enantioselective reduction of 1,2-diaryl-2-benzyloxyiminoethanones and 1,2-diarylethanediones was conducted using oxazaborolidine derived from L-threonine and borane complexes to give B-imino alcohols and 1,2-diaryl-1,2-ethanediols in high enantiomeric purity. Subsequent reduction of the imino functionality of the former products afforded either syn- or anti-2-amino-1,2-diarylethanols in high enantiomeric purity by choosing appropriate reduction methods. (C) 1998 Elsevier Science Ltd. All rights reserved.
Preparation of Optically Pure (1R, 2S)- and (1S, 2R)-DI-<i>p</i>-Methoxyphenyl Amino Alcohol
作者:Jian Liao、Yili Zhang、Zhi Li、Daimo Chen、Albert S. C. Chan
DOI:10.1080/00397910008086985
日期:2000.9
Abstract Racemic di-p-methoxyphenyl amino alcohol was synthesized in three steps. Optically pure di-p-methoxyphenyl amino alcohols were obtained by recrystallization. The absolute configuration of the amino alcohol was determined by X-ray crystallography.
摘要 分三步合成了外消旋二对甲氧基苯基氨基醇。通过重结晶获得光学纯的二对甲氧基苯基氨基醇。氨基醇的绝对构型通过 X 射线晶体学确定。
Stereodivergent approach to syn- and anti-2-amino-1,2-diarylethanols using oxazaborolidine-mediated asymmetric reduction
Highly enantioselective reduction of 1,2-diaryl-2-benzyloxyiminoethanones was conducted using oxazaborolidine derived from L-threonine and BH3. SMe2 to give B-imino alcohols in high enantiomeric purity. Subsequent reduction of the imino functionality afforded either syn- or anti-2-amino-1,2-diarylethanols in high enantiomeric purity by choosing appropriate reduction conditions. (C) 1997 Elsevier Science Ltd.