Fused carbazoles by tandem Aza Wittig/electrocyclic ring closure. Preparation of 6H-pyrido[4,3-b] carbazole, 11H-pyrido[4,3-a]carbazole and 11H-pyrido[3,4-a]carbazole derivatives
作者:Pedro Molina、Pilar M. Fresneda、Pedro Almendros
DOI:10.1016/s0040-4020(01)85813-0
日期:1993.2
appropriate formylcarbazole by sequential treatment with ethyl azidoacetate and triphenylphosphine, with isocyanates leads to the linear 6H-pyrido[4,3-b] carbazole 5, the angular 11H-pyrido[4,3-a]carbazole 13 and the isomeric 11H-pyrido[3,4-a]carbazole 19 respectively.
亚氨基正膦的维蒂希氮杂型反应3,12和16,通过与叠氮基乙酸乙酯和三苯基膦,与异氰酸酯通向线性6顺序处理从适当formylcarbazole制备ħ吡啶并[4,3-b]咔5,角度11 ħ -吡啶并[4,3-a]咔唑13和异构体11 H-吡啶并[3,4-a]咔唑19。