ENANTIOSELECTIVE PREPARATION OF KEY INTERMEDIATES FOR STEROID SYNTHESIS THROUGH THE ASYMMETRIC MICHAEL ADDITION PROCESS INVOLVING CHIRAL IMINES.

Article abstract of DOI:10.1016/S0040-4039(00)80513-4

(S)-Phenanthrone 7, prepared from ketone 4 (80 percent yield, 93 percent ee), was transformed into compounds 8, 9, 13, 15 and 16, useful intermediates in steroid synthesis.