Enantioselective Organocatalytic Synthesis of Quaternary α-Amino Acids Bearing a CF<sub>3</sub> Moiety
作者:Ralph Husmann、Erli Sugiono、Stefanie Mersmann、Gerhard Raabe、Magnus Rueping、Carsten Bolm
DOI:10.1021/ol103093r
日期:2011.3.4
A highly enantioselective Friedel−Crafts reaction catalyzed by a chiral phosphoric acid was developed. N-Boc-protected ethyl trifluoropyruvate imine was activated by 6 mol % of catalyst and reacted with a wide variety of indole derivatives to afford quaternary α-amino acids in excellent yields (up to 99%) and high enantioselectivities (up to 98:2 er).
开发了由手性磷酸催化的高度对映选择性的Friedel-Crafts反应。N -Boc保护的三氟丙酮酸乙酯亚胺被6摩尔%的催化剂活化,并与多种吲哚衍生物反应,以优异的收率(高达99%)和高对映选择性(高达98:2)提供季α-氨基酸。 er)。