(1'R,2'R,6'S,9'R,11'S,13'S,14'S)-4'-(cyclohexylmethyl)-14'-hydroxyspiro[1,3-dioxane-2,10'-12-oxa-4-azatetracyclo[7.5.0.02,6.011,13]tetradecane]-3',5'-dione 在
p-toluenesulfonic acid resin 作用下,
以
水 、
丙酮 为溶剂,
反应 12.0h,
以90%的产率得到(3aS,5aR,6aS,7aS,8S,8aR,8bR)-2-Cyclohexylmethyl-8-hydroxy-octahydro-7-oxa-2-aza-cyclopenta[a]cyclopropa[g]naphthalene-1,3,6-trione