Reaction of Bromomethylazoles and Tosylmethyl Isocyanide. A Novel Heterocyclization Method for the Synthesis of the Core of Marine Alkaloids Variolins and Related Azolopyrimidines
作者:Javier Mendiola、Alejandro Baeza、Julio Alvarez-Builla、Juan J. Vaquero
DOI:10.1021/jo0358168
日期:2004.7.1
A novel and efficient synthesis of the pyrido[3‘,2‘:4,5]pyrrolo[1,2-c]pyrimidine system, the heterocyclic core of the variolin family of marine alkaloids, is described. The route involves the reaction of 3-bromo-2-(bromomethyl)pyrrolo[2,3-b]pyridine and tosylmethyl isocyanide (TosMIC) under phase-transfer conditions. This unprecedented reaction was also used to synthesize a series of new methoxycarbonyl
描述了一种新颖高效的吡啶并[3',2':4,5]吡咯并[1,2- c ]嘧啶系统的合成,该系统是海洋生物碱的variolin家族的杂环核心。该路线涉及3-溴-2-(溴甲基)吡咯并[2,3- b ]吡啶与甲苯磺酰基甲基异氰化物(TosMIC)在相转移条件下的反应。通过TosMIC与溴甲基吲哚,溴甲基苯并咪唑和溴甲基吡唑的反应,该空前的反应还用于合成一系列新的甲氧基羰基氮杂嘧啶。5-溴-7-甲氧基羰基吡啶并[3',2':4,5]吡咯并[1,2- c的水解和脱羧通过该杂环化方法获得的嘧啶嘧啶并在C5位置安装嘧啶部分,这为完成variolin B的全合成提供了另一种方法。