Iminophosphorane-mediated synthesis of fused carbazoles. A facile one-pot preparation of 7H-pyrido [4,3-c]carbazole and 10H-pyrido[3,4-b]carbazole derivatives.
作者:Pedro Molina、Pilar M. Fresneda、Pedro Almendros
DOI:10.1016/s0040-4020(01)86454-1
日期:1991.1
The aza Wittig-type reaction of iminophosphorane 3, ethyl α-[(triphenylphosphoranylidene) amino]-β-[3-(9-methyl)carbazolyl)acrylate with isocyanates leads to the corresponding pyrido[4,3-c]carbazoles 5. Similarly, iminophosphorane 8 undergoes pyrido annelation by reaction with isocyanates to give the isomeric 10H-pyrido [3,4-b]carbazoles (isoellipticines) 10.
亚氨基膦烷3,乙基α-[(三苯基正膦亚基)氨基]-β-[3-(9-甲基)咔唑基)丙烯酸酯与异氰酸酯的氮杂维特希型反应生成相应的吡啶并[4,3-c]咔唑5。类似地,亚氨基磷烷8通过与异氰酸酯反应而经历吡啶酮成环反应,以得到异构体10H-吡啶并[3,4-b]咔唑(异玫瑰树碱)10。