描述:
(6aR,7S,9aS,13aS)-2-(t-butoxycarbonyl)-5-(t-butoxycarbonyloxy)-2,3,6,6a,7,8,9,9a,10,13-decahydro-6a,7,10,10-tetramethyl-3-oxo-1H-benzo[8,8a][1]benzopyrano[2,3-e]isoindole 以68 mg (94%)的产率得到(6aR,7S,9aS,13aS)-5-(t-butoxycarbonyloxy)-2,3,6,6a,7,8,9,9a,10,13-decahydro-6a,7,10,10-tetramethyl-3-oxo-1H-benzo[8,8a][1]benzopyrano[2,3-e]isoindole