X=Y-ZH Systems as potential 1,3-dipoles. Part 38. 1,5-Electrocyclisation of vinyl-and iminyl-azomethine ylides. 2-Azaindolizines and pyrrolo-dihydro-isoquinolines.
作者:Ronald Grigg、Peter Kennewell、Vladimir Savic、Visuvanathar Sridharan
DOI:10.1016/s0040-4020(01)88345-9
日期:1992.11
Azomethine ylides generated by the decarboxylation of imines of a- amino acids and 2,2′- dipyridyl ketone undergo 1,5-electrocyclisation and subsequent aromatisation to generate 1,3- disubstituted-2-azaindolizines. Azomethine ylides generated from 1,2,3,4- tetrahydroisoquinoline and diarylidene acetone undergo 1,5-electrocyclisation and subsequent prototropic rearrangement. to give pyrrolo-5,6-dihydroisoquinolines
通过α-氨基酸的亚胺和2,2'-二吡啶基酮的脱羧反应生成的甲亚胺基团经过1,5-电环化,随后进行芳构化,生成1,3-二取代-2-氮杂吲哚并酮。由1,2,3,4-四氢异喹啉和二亚芳基丙酮生成的甲亚胺基团经过1,5-电环化和随后的质子重排。得到吡咯并5,6-二氢异喹啉。