(5aα,9aα,9bα)-4-(tert-butyldimethylsilyl)oxy-9-ethoxyethynyl-2,3,5,5a,6,9,9a,9b-octahydro-9-hydroxy-8,9a-dimethyl-1H-benz[e]indene-2,6-dione, 2-(propylene thioacetatal) 在
potassium fluoride 作用下,
以
甲醇 为溶剂,
反应 14.0h,
以78%的产率得到(1RS,2RS,3RS,7SR,8SR,10SR)-1-(ethoxyethynyl)-8-hydroxy-2,13-dimethyl-14-oxatetracyclo[6.5.1.0
2,10.0
3,7]tetradec-12-ene-5,11-dione, 5-(propylene thioacetal)