11-acetoxy-22,23-dihydroazadirachtin 在
4 A molecular sieve 、
pyridinium chlorochromate 作用下,
以
二氯甲烷 为溶剂,
以49%的产率得到dimethyl <2aR,4R(4S,5R,6S,7R),4aR,5S,7aS,8S(E),10R,10aR,10bR>-5,10-diacetoxy-4-methyl-4-(6-methyl-2,8-dioxo-5,6-epoxy-4,7-methano-1,3-dioxecan-5-yl)-8-(2-methylbut-2-enoyloxy)-3-oxodecahydronaphtho<1,8-bc:4,4a-c'>difuran-5,10a-dicarboxylate