Enantioselective addition of diethylzinc to aldehydes catalyzed by (R)-1-phenylethylamine-derived 1,4-amino alcohols
作者:Masatoshi Asami、Naomichi Miyairi、Yukihiro Sasahara、Ken-ichi Ichikawa、Naoya Hosoda、Suguru Ito
DOI:10.1016/j.tet.2015.07.031
日期:2015.9
alcohols, synthesized from (R)-1-phenylethylamine, were used as chiral ligands for the enantioselective addition of diethylzinc to benzaldehyde. (S)-1-Phenyl-1-propanol was obtained with high enantioselectivity in all cases since the stereochemical outcome of the reaction was controlled by the chiral benzylic carbon bearing amino group. Highest catalytic activity was obtained by using (R)-1-2-[1-(pyrroli
由(R)-1-苯基乙胺合成的一系列邻亚二甲苯基型1,4-氨基醇被用作手性配体,用于将二乙基锌对映选择性地加成到苯甲醛中。在所有情况下,由于反应的立体化学结果是由带有手性苄基碳原子的氨基控制的,因此在所有情况下都以高对映选择性获得了(S)-1-苯基-1-丙醇。通过使用衍生自(R)-1-(1-苯乙基)的(R)-1- 2- [1- [吡咯烷-1-基)乙基]苯基}环己-1-醇(1n)获得最高的催化活性。吡咯烷和环己酮。在1n的存在下,二乙基锌与醛的反应可制得各种手性仲醇。 在2小时内具有良好的对映选择性。