Carbene Reactions of α-Oxacyclo- and α-Azacyclo-N-aziridinylimines: Effect of Heteroatom and Ring Size in the Ring Expansion Reaction
作者:Sunggak Kim、Joo-Yong Yoon
DOI:10.1055/s-2000-7598
日期:——
Carbenes, generated from thermolysis of α-oxacyclo- and α-azacyclo-N-aziridinylimines in refluxing toluene, underwent ring expansions via insertion of alkyl carbenes into carbon-carbon bonds and intramolecular ammonium ylide formations, respectively. Ring expansion reaction of α-oxetanyl-N-aziridinylimines occurred via alkylidenecarbene intermediates, whereas thermal reaction of α-azetidinyl-N-aziridinylimines afforded α-aminoacetylene compounds via 1,2-H migration of alkylidenecarbene intermediates.
δ-氧杂环-和δ-氮杂环-N-氮丙啶亚胺在回流甲苯中热解生成的碳烯分别通过烷基碳烯插入碳-碳键和分子内铵盐形成发生扩环反应。δ-氧杂环丁基-N-氮丙啶亚胺通过亚烷基羰基中间体发生扩环反应,而δ-氮杂环丁基-N-氮丙啶亚胺通过亚烷基羰基中间体的 1,2-H 迁移发生热反应,生成δ-氨基乙炔化合物。