Diels-Alder Reaction of (S)-2-p-Tolylsulfinyl-2-cyclopentenone with Dane's Diene: an Efficient Approach to the Enantioselective Preparation of Perhydro-cyclopentaphenanthrenes

Article abstract of DOI:10.1016/S0040-4039(00)78571-6

The reactions of (S)-2-p-tolylsulfinyl-2-cylopentenone with Dane's diene catalyzed by EtAlCl2 yields adducts easily desulfinylated into optically pure perhydro-cyclopentaphenanthrenes.The endo-(controlled by CO group) and regio- (controlled by the subs