The first 1,7-electrocyclizations of butadienyl pyridinium ylides: Stereoselective formation of 1,2-annulated 2,3-dihydroazepines
作者:Karsten Marx、Wolfgang Eberbach
DOI:10.1016/s0040-4020(97)01045-4
日期:1997.10
Upon deprotonation of pentadienyl substituted pyridinium bromides , conjugated azomethine ylide-type dipoles are formed which undergo stereoselective 8π-electrocyclization affording 10,10a-dihydropyrido[1,2-a]-azepines8a-k and 15a,b, respectively.
在戊二烯基取代的吡啶鎓溴化物去质子化后,形成共轭的偶氮甲ine基内酯型偶极,其经历立体选择性8π-电环化,分别提供10,10a-二氢吡啶并[1,2- a ]-氮杂环庚烷8a-k和15a,b。