Epoxidation of alnus-5-en-3β-yl acetate with m-chloroperbenzoic acid gave a 5β,6β-epoxide as a main product together with a 5α,6α-epoxide as a minor product. Treatment of the α-epoxide with BF3·OEt2 afforded a 1(10),5-diene and a mixture of 6α-hydroxy-12- and -18-ene derivatives. The 12-ene was converted into daturadiol (=olean-12-ene-3β,6β-diol).
用间
氯过
苯甲酸环氧化 alnus-5-en-3β-yl
乙酸酯得到 5β,6β-
环氧化物作为主要产物和 5α,6α-
环氧化物作为次要产物。用
BF3·OEt2 处理α-
环氧化物得到1(10),5-二烯和6α-羟基-12-和-18-烯衍
生物的混合物。12-烯转化为曼陀罗二醇(=olean-12-ene-3β,6β-diol)。