New β-amino alcohols derived from L-valine as chiral inductors for enantioselective reductions of, and nucleophilic additions to carbonyl compounds
作者:P. Delair、C. Einhorn、J. Einhorn、J.L. Luche
DOI:10.1016/0040-4020(94)00947-s
日期:1995.1
β-Amino alcohols derived from L-valine were used as chiral ligands in oxazaborolidine reductions of ketones. Structural modifications, such as the introduction of alkyl groups on the carbinol carbon and the nitrogen atoms, were shown to influence unfavourably the enantioselectivity. In contrast, the addition of diethyl zinc to aldehydes occurs with enhanced e.e.'s using these modified inductors, which
衍生自L-缬氨酸的β-氨基醇用作手性配体用于酮的恶唑硼烷还原反应中。结果表明,在甲醇碳和氮原子上引入烷基等结构修饰会不利地影响对映选择性。相反,使用这些改性的感应剂,在增强的ee的作用下,向醛中添加了二乙基锌,这使得与各种醛达到有用的对映选择性。