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.