作者:Gerhard Quinkert、Michael del Grosso、Astrid Bucher、Markus Bauch、Wolfgang Döring、Jan W Bats、Gerd Dürner
DOI:10.1016/s0040-4039(00)92517-6
日期:1992.6
Diene 1 and dienophile 4a in a Diels/Alder reaction mediated by a chiral ligand-modified Lewis acid enantioselectively furnish adduct 5a (chem. yield. 64%, e.e.: 73%), which after partial deoxygenation and final enantioselection by recrystallization affords 5b. The latter compound can easily be converted via Torgov's pentaenone 6a into estrogens or progestogens.