Asymmetric Catalytic Mannich Reactions Catalyzed by Urea Derivatives: Enantioselective Synthesis of <i>β</i>-Aryl-<i>β</i>-Amino Acids
作者:Anna G. Wenzel、Eric N. Jacobsen
DOI:10.1021/ja028353g
日期:2002.11.1
Highly enantioselective addition reactions between silyl ketene acetals and N-Boc aldimines are catalyzed by the thiourea-based catalyst 1c. Extraordinary scope is observed in this methodology with regard to the imine substrate, with aryl and heteroaromatic derivatives generally affording nearly quantitative yields of β-amino ester product in up to 98% enantioselectivity.
甲硅烷基乙烯酮缩醛和 N-Boc 醛亚胺之间的高度对映选择性加成反应由硫脲基催化剂 1c 催化。这种方法在亚胺底物方面观察到了非凡的范围,芳基和杂芳族衍生物通常以高达 98% 的对映选择性提供几乎定量的 β-氨基酯产物产率。