Synthesis of the novel pyrrolo[2,1-d][1,2,5]benzotriazepine, pyrrolo[2,1-e][1,3,6]benzotriazocine and pyrrolo[1,2-a]tetrazolo[1,5-d][1,4]benzodiazepine ring systems. A new route to pyrrolo[1,2-a]quinoxaline via transamination of in situ generated 1-(2-aminophenyl)-2-iminomethylpyrroles
作者:Demetrios Korakas、Athanasios Kimbaris、George Varvounis
DOI:10.1016/0040-4020(96)00597-2
日期:1996.8
2-aminomethyl-1-(2-nitrophenyl)pyrrole 10. Pyrrolo[1,2-a]quinoxaline 15 is obtained by treating aminoester 12 with formaldehyde. Diamine 8 reacts with either formaldehyde or benzaldehyde to give pyrrolo[1,2-a]quinoxaline 19. Compound 10 was reductively cyclised to pyrrolo[2,1-d][1,2,5]-benzotriazepine 22. Intramolecular coupling of diamine 8 with triphosgene or carbon disulfide yields pyrrolo[2,1-e][1,3,6]benzotriazocine
选择性还原2-叠氮甲基-1-(2-硝基苯基)吡咯5,得到2-氨基甲基-1-(2-硝基苯基)吡咯10。吡咯并[1,2-a]喹喔啉15是通过用甲醛处理氨基酯12得到的。二胺8与甲醛或苯甲醛反应生成吡咯并[1,2-a]喹喔啉19。化合物10被还原环化吡咯并[2,1-d] [1,2,5] -benzotriazepine 22。二胺8与三光气或二硫化碳的分子内偶联产生吡咯并[2,1-e] [1,3,6]苯并三唑嗪23和24, 分别。氰基叠氮化物6的分子内1,3-偶极环加成反应得到吡咯并[1,2-a]四唑[1,5-d] [1,4]苯并二氮杂25。