trimethylsilyliodide, hydrolysis and addition of diazomethane in 92% yield. Reaction of 5c with sodium azide gave 65% of the 8-azidomethylester 5d which was reduced with 1,3-propanedithiol to give bakankosin 2a after solvolysis in 80% yield.
用
硼氢化钠还原secologanin 1a,然后进行酰化,得到86%的苦味苷
四乙酸酯4,通过用三甲基甲
硅烷基
碘化物处理,
水解并以92%的产率加入
重氮甲烷将其转化为8-
碘甲基酯5c。5c与
叠氮化
钠的反应得到65%的8-
叠氮基甲基酯5d,其在溶剂化后用1,3-丙二
酚还原以得到巴坎考辛2a,产率为80%。