Brønsted acid-mediated annulations of pyrroles featuring N-tethered α,β-unsaturated ketones and esters: Total syntheses of (±)-tashiromine and (±)-indolizidine 209I
作者:Wesley J. Olivier、Michael G. Gardiner、Alex C. Bissember、Jason A. Smith
DOI:10.1016/j.tet.2018.04.067
日期:2018.9
tetrahydroindolizines and tetrahydropyrrolo[1,2-a]azepines via Brønsted acid-mediated annulation of pyrroles featuring N-tethered α,β-unsaturated esters. In addition, the Brønsted acid-catalyzed cyclization of pyrroles featuring pendant α,β-unsaturated ketones was applied to complete total syntheses of the indolizidine alkaloids (±)-tashiromine and (±)-indolizidine 209I.
这项研究提供了第一个关于通过布朗斯台德酸介导的N系α,β-不饱和酯吡咯环解法制备四氢吲哚嗪和四氢吡咯并[1,2-a]氮杂环庚烷的报道。另外,将具有α,β-不饱和侧基侧基的吡咯的布朗斯台德酸催化的吡咯环化反应用于完成吲哚并立生物碱(±)-tashiromine和(±)-吲哚并立啶209I的全部合成。