Novel syntheses of camptothecin alkaloids, part I. Intramolecular [4+2] cycloadditions of N-arylimidates and 4H-3,1-benzoxazin-4-ones as 2-aza-1,3-dienes
作者:Joseph M.D Fortunak、Antonietta R Mastrocola、Mark Mellinger、Nicolas J Sisti、Jeffery L Wood、Zhi-Ping Zhuang
DOI:10.1016/0040-4039(96)01204-x
日期:1996.8
The first reported intramolecular [4+2] cycloadditions of both N-arylimidates and 4H-3,1-benzoxazin-4-ones acting as 2-aza-1,3-dienes are described. Reaction with unactivated alkynes leads to pyrrolo[3,4-b]quinolines which constitute the ABC ring system of camptothecins.
描述了N-芳基亚氨酸酯和充当2-氮杂-1,3-二烯的4 H -3,1-苯并恶嗪-4-酮的首次报道的分子内[4 + 2]环加成。与未活化的炔烃反应会生成吡咯并[3,4-b]喹啉,它们构成喜树碱的ABC环系统。