Highly enantioselective Mannich reactions of imines with tert-butyl acetoacetate catalyzed by squaramide organocatalyst
作者:Hai-Xiao He、Da-Ming Du
DOI:10.1016/j.tetasy.2014.03.010
日期:2014.4
Highly enantioselective Mannich reactions of iminesbearing a benzothiazolemoiety with tert-butyl acetoacetate, catalyzed by a cinchona-based squaramide organocatalyst have been developed. The corresponding benzothiazole β-keto ester derivatives were obtained in high yields (up to 99%) and with excellent enantioselectivities (up to 98% ee).