Asymmetric conjugate addition of zincates or cuprates containing an optically active azaenolate of erythro-isopropylidene-2-methoxy-1,2-diphenylamine to 2-cycloalkenones
Asymmetric conjugate addition to prochiral cycloalkenones was examined by utilizing a zinc azaenolate as well as a copper one derived from an acetone imine of opticallyactive erythro-2-methoxy-1,2-diphenylethylamine, the best enantioselectivity of the resulting 3-acetonylcycloalkanones being as high as 92% ee.