Thermal cyclization of N-[2-(2-propenyl)-1-naphthyl] ketenimines: intramolecular Diels–Alder reaction versus [1,5] hydrogen migration. Synthesis of dibenz[b,h]acridines and benzo[h]quinolines
作者:Mateo Alajarín、Ángel Vidal、María-Mar Ortín
DOI:10.1016/j.tet.2005.05.092
日期:2005.8
the expected aza-Claisen rearranged products, 2-(2-propenyl)-1-naphthylamines and benz[ g ]indoles, these last derived from an intramolecular hydroamination reaction on those primary products. The 2-(2-propenyl)-1-naphthylamines were converted into their triphenylphosphazene derivatives, which by aza-Wittig reaction with disubstituted ketenes yielded N -[2-(2-propenyl)-1-naphthyl] ketenimines. The heating
摘要 N -(2-丙烯基)-1-萘胺的热处理提供了预期的 aza-Claisen 重排产物 2-(2-丙烯基)-1-萘胺和苯并[g]吲哚,它们最后衍生自分子内氢胺化对这些初级产品的反应。2-(2-丙烯基)-1-萘胺被转化为它们的三苯基磷腈衍生物,通过氮杂-维蒂希与双取代的乙烯酮反应生成N-[2-(2-丙烯基)-1-萘基]乙烯酮亚胺。这些酮亚胺在沸腾的甲苯中加热,通过分子内 Diels-Alder 反应引起它们的环化,得到二苯并[b, h]吖啶,或通过 [1,5] 氢从丙烯基取代基的 sp 3 碳原子迁移到酮亚胺片段的中心碳原子,然后是 6π 电环闭合,得到苯并[h]喹啉。