Coupling of racemic 16-methoxycarbonyl-15,20-dihydro-3,Nb-seco-cleavamine derivative 34 with (-)vindoline via chloroindolenine intermediate 41 occurs with high stereoselectivity and leads after cyclization to the separable dimers 46I and 46II with natural C(14'),C(16')-configuration in good yields. Tetracyclic lactam 37 with vinblastine analogous stereochemistry is prepared and transformed to chloroindolenine
的耦合外消旋16-甲氧基羰基-15,20-二氢3,N b -开环-cleavamine衍
生物34( - )经由chloroindolenine中间体41
文多灵环化于可分离二聚体46I和46II与天然℃后高立体选择性和引线发生(14′),C(16′)-构型具有良好的产率。制备具有
长春碱类似立体
化学的四环内酰胺37,并将其转化为
氯吲哚胺38。以良好的收率实现了38与N,N-二甲基-间-茴香胺的偶联。