(4aS,8aS,9S)-9-(二甲基氨基)-4a-[[叔丁基二甲基硅烷基]氧基]-8a,9-二氢-3-(苯基甲氧基)-萘并[2,3-d]异恶唑-4,5(4aH,8H)-二酮 、
Phenyl 4,5-dibromo-2-ethyl-3-fluoro-6-[(2-methylpropan-2-yl)oxycarbonyloxy]benzoate 在
四甲基乙二胺 、
lithium diisopropyl amide 作用下,
生成 (4aS,11R,11aR,12aS,13S)-3-(benzyloxy)-8,9-dibromo-4a-((tert-butyldimethylsilyl)oxy)-13-(dimethylamino)-10-fluoro-5-hydroxy-11-methyl-4,6-dioxo-4,4a,6,11,11a,12,12a,13-octahydrotetraceno[2,3-d]isoxazol-7-yl tert-butyl carbonate