作者:Pedro Molina、Pilar M. Fresneda、Santiago Delgado、Juan Antonio Bleda
DOI:10.1016/s0040-4039(01)02321-8
日期:2002.2
The synthesis of the marine alkaloid variolin B has been completed in seven steps, starting from the iminophosphorane derived from ethyl α-azido-β-(4-methoxy-7-azaindol-3-yl) acrylate, available by condensation of 2-formyl-4-methoxy-7-aza-indole with ethyl azidoacetate. Formation of the annulated 2-aminopyrimidine ring is achieved by tandem aza-Wittig/carbodiimide-mediated cyclization whereas the 2-aminopyrimidine
从衍生自α-
叠氮基-β-(
4-甲氧基-7-氮杂吲哚-3-基)
丙烯酸乙酯的亚
氨基
磷烷开始的七个步骤完成了海洋
生物碱variolin B的合成,该
丙烯酸可通过2-甲酰基的缩合反应获得。具有
叠氮基
乙酸乙酯的-
4-甲氧基-7-氮杂吲哚。通过串联的氮杂-维蒂希/碳二
亚胺介导的环化反应,形成环状的2-
氨基嘧啶环,而使用乙酰基作为
嘧啶环的C 2部分形成C-5处的2-
氨基嘧啶取代基。