Phenyl 3-(dimethylamino)-2-methyl-6-[(2-methylpropan-2-yl)oxycarbonyloxy]benzoate 、
(4aS,8aS,9S)-3-(benzyloxy)-4a-((tert-butyldimethylsilyl)oxy)-9-(dimethylamino)-8-methylene-8a,9-dihydronaphtho[2,3-d]isoxazole-4,5(4aH,8H)-dione 在
四甲基乙二胺 、
lithium diisopropyl amide 作用下,
以
四氢呋喃 为溶剂,
反应 2.67h,
以57%的产率得到((4aS,11aS,12aS,13S)-3-(benzyloxy)-4a-((tert-butyldimethylsilyl)oxy)-10,13-bis(dimethylamino)-5-hydroxy-12-methylene-4,6-dioxo-4,4a,6,11,11a,12,12a,13-octahydrotetraceno[2,3-d]isoxazol-7-yl tert-butyl carbonate)