Syntheses of pyrrolizidines and indolizidines from α,β-unsaturated sugar δ-lactones via Dieckmann condensation
作者:Joanna Rabiczko、Zofia Urbańczyk-Lipkowska、Marek Chmielewski
DOI:10.1016/s0040-4020(02)00005-4
日期:2002.2
Both N-methoxycarbonylmethyl- and N-methoxycarbonylethyl-derivatives of dihydroxy-(d)-homoproline were subjected to the intramolecular ester condensation to yield ketoesters of pyrrolizidine and indolizidine series, respectively. The former ketoester was transformed into derivative related to australine, while the latter were transformed into the natural lentiginosine as well as its 2-epi-, and 7-
既Ñ -methoxycarbonylmethyl-和Ñ二羟基- (d)的-methoxycarbonylethyl衍生物-homoproline进行分子内酯缩合,得到分别为吡咯烷类和吲哚里系列酮酯。前者的酮酸酯被转化为与奥沙林有关的衍生物,而后者则被转化为天然的lentiginosine以及其2- epi-和7-hydroxy-2- epi-衍生物。