5,6-Dihydroindolizines as Convenient Precursors of Indolizidine 167B and Analogues
作者:Roberta Settambolo、Giuditta Guazzelli、Raffaello Lazzaroni
DOI:10.1055/s-2005-918407
日期:——
Starting from 5-carboxyethyl-5,6-dihydroindolizine, the title alkaloid was obtained in 25% overall yield via differently C5-substituted 5,6-dihydroindolizines and final exhaustive hydrogenation. An alternative strategy for the synthesis of optically active indolizidine 167B and analogues still based on 5,6-dihydroindolizine intermediates is given.
从 5-羧乙基-5,6-二氢吲嗪开始,通过不同的 C5 取代的 5,6-二氢吲嗪和最终的穷举氢化,得到了标题生物碱,总收率为 25%。本文给出了一种仍以 5,6-二氢吲嗪中间体为基础合成具有光学活性的吲哚利嗪 167B 及其类似物的替代策略。