Journal of Organic Chemistry p. 5625 - 5631 (1990)
Update date:2022-08-03
Topics:
Nemoto, Hideo
Matsuhashi, Norikazu
Imaizumi, Mari
Nagai, Mitsuo
Fukumoto, Keiichiro
The intramolecular <4 + 2> cycloaddition of an olefinic o-quinodimethane, having an optically active oxathiane system as a stereodirecting group, leads enantioselectively to A-nor B-aromatic steroids.This reaction is the key in an enantioselective total synthesis of (+)-cortisone (1).
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