Enantioselective alkylation of aldehydes promoted by (S)-tyrosine-derived β-amino alcohols
作者:Christian Wolf、Christopher J Francis、Pili A Hawes、Mirage Shah
DOI:10.1016/s0957-4166(02)00469-x
日期:2002.8
found to exhibit opposite chiral induction. The secondary amino alcohol favors the formation of (S)-alcohols, whereas the tertiary amino alcohol provides (R)-alcohols. Enantioselectivity and sense of chiral induction obtained with the secondary amino alcohol was proven to depend on the choice of solvent and experimental procedure. The mechanism of the enantioselective ethylation of benzaldehyde promoted
使用二乙基锌将两种分别显示仲和叔氨基部分的(S)酪氨酸衍生的β-氨基醇用于醛的对映选择性烷基化。通过对苯甲醛,环己烷甲醛和己醛的高通量筛选,比较了这些预催化剂的对映选择性,催化活性和底物特异性。发现同手性催化剂表现出相反的手性诱导。仲氨基醇有助于形成(S)醇,而叔氨基醇则提供(R)-酒精。用仲氨基醇获得的对映选择性和手性诱导的感觉被证明取决于溶剂的选择和实验程序。通过化学计量实验和MM2计算研究了由(S)-酪氨酸衍生的β-氨基醇促进的苯甲醛对映选择性乙基化的机理。