Asymmetric deprotonation of prochiral ketones using chiral lithium amide bases
作者:Christian M. Cain、Richard P.C. Cousins、Greg Coumbarides、Nigel S. Simpkins
DOI:10.1016/s0040-4020(01)85435-1
日期:1990.1
A number of chiral secondary amines have been prepared and used as precursors to the corresponding chirallithiumamidebases. Treatment of either cis-2,6-dimethylcyclohexanone or 4-tert-butylcyclohexanone with a chirallithiumamide, followed by electrophilic quench, gives chiral products in up to 88% enantiomeric excess. The results with 4-tert-butylcyclohexanone are in disagreement with an earlier