rac-2-((1R,3aS,6R,7aR)-1,5',5'-trimethyl-6-(phenylsulfonyl)hexahydrospiro[indene-4,2'-[1,3]dioxan]-7a(5H)-yl)ethyl 4-methylbenzenesulfonate 在
potassium tert-butylate 作用下,
以
六甲基磷酰三胺 为溶剂,
反应 1.5h,
以85%的产率得到rac-(3'R,3a'R,6'R,8a'S)-3',5,5-trimethyl-6'-(phenylsulfonyl)octahydrospiro[[1,3]dioxane-2,8'-[3a,6]methanoazulene]