22,23-dihydro-7-oxo-11,20-dimethoxyazadirachtin 在
Amberlyst 15 作用下,
以
甲醇 为溶剂,
反应 72.0h,
以59%的产率得到<2aR,3R,5S(E),5aS,8S,8aR,8bR,9S,10S,12R(2S,3S),13R,14aR,14bR,14cR> dimethyl 3-acetoxy-12-(2,3-dimethoxytetrahydro-3-furyl)-8b,13-dimethyl-9-hydroxy-8-methoxy-5-(2-methylbut-2-enoyloxy)-10,14a-epoxyhexadecahydro-9,13-methanodifuro....