Regiochemical aspects of intramolecular cycloadditions of nitrones derived from N-(2-alkenyl)-2-pyrrolecarbaldehydes. Competitive entries to pyrrolizidine and indolizidine derivatives
作者:Gianluigi Broggini、Concetta La Rosa、Tullio Pilati、Alberto Terraneo、Gaetano Zecchi
DOI:10.1016/s0040-4020(01)00785-2
日期:2001.9
Intramolecular cycloadditions of unsaturated nitrones derived from a series of N-(2-alkenyl)-2-pyrrolecarbaldehydes (2) have been systematically studied. A pronounced substituent effect has been observed as far as the competitive formation of fused- and bridged-ring regioisomers are concerned. Further elaboration of the two kinds of cycloadducts has given pyrrolizidine and indolizidine derivatives
系统地研究了衍生自一系列N-(2-烯基)-2-吡咯甲醛(2)的不饱和亚硝基的分子内环加成反应。就稠密和桥环区域异构体的竞争性形成而言,已观察到明显的取代作用。两种环加合物的进一步详细说明分别给出了吡咯嗪和吲哚并嗪衍生物。