Enantioselective Addition of Diethylzinc to Aldehydes Catalyzed by Diastereomeric 1,4-Amino Alcohols with <i>o</i>-Xylylene Skeleton
作者:Masatoshi Asami、Atsushi Nagai、Yukihiro Sasahara、Ken-ichi Ichikawa、Suguru Ito、Naoya Hosoda
DOI:10.1246/cl.141113
日期:2015.3.5
Two diastereomeric 1,4-amino alcohols with o-xylylene structure (S,R)-2 and (S,S)-3, synthesized from chiral 1,4-diol (S,S)-1, were utilized as chiral ligands for the enantioselective addition of diethylzinc to aldehydes. The stereochemical outcome of the reactions was controlled solely by the absolute configuration of the benzylic carbon bearing amino group, and both enantiomers of 1-substituted propanol were obtained with up to 98% (S) and 96% (R) enantiomeric excesses.
由手性 1,4- 二醇 (S,S)-1 合成的两种具有邻二甲苯结构的非对映 1,4- 氨基醇 (S,R)-2 和 (S,S)-3,被用作二乙基锌与醛的对映选择性加成的手性配体。反应的立体化学结果完全由带有氨基的苄基碳的绝对构型控制,并获得了 1-取代丙醇的两种对映体,其对映体过量率分别高达 98%(S)和 96%(R)。