Evidence for a stepwise mechanism in formal hetero-Diels-Alder reactions of N-arylimines
作者:Frank Linkert、Sabine Laschat、Sirpa Kotila、Thomas Fox
DOI:10.1016/0040-4020(95)00947-7
日期:1996.1
17d,f with terminal alkene or alkyne moieties could not be cyclized under these conditions, imine 17b with a C-3 tether gave three diastereomeric pyrrolo-[1′,2′:1,2]azepino[3,4-b]quinolines 18a-c and imine 17c gave two diastereomeric 7,7-diphenyl-indolizino-[3,4-b]quinolines 19a,b. High cis/trans-ratios were observed in both cases. Imine 17e bearing an internalalkyne underwent a cyclization/dehydrogenation