A Highly Enantioselective Chiral Lewis Base-Catalyzed Asymmetric Cyanation of Ketones
作者:Shi-Kai Tian、Li Deng
DOI:10.1021/ja010690m
日期:2001.6.1
A conceptually direct and attractive approach is to transform prochiral ketones to chiralbuildingblocks containing a quaternary stereocenter by a catalytic asymmetric C bond formation. The realization of this approach, however, has proven to be a formidable task. 1,2d,3 Achieving synthetically useful enantioselectivity with unconjugated aliphatic ketones is particularly challenging since the two