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。
Palladium-Catalyzed Diastereoselective Oxyarylation of 2-Alkylindoles
摘要:
Diastereoselective oxyarylation of N-protected 2-alkylindoles with commercially available boronic acids and TEMPO as a mild oxidant to give N-protected 2-aryl-2-alkyl-3-(2-chloroacetoxy)indolines is described. Reactions are easy to conduct, and product indolines containing a fully substituted C-center are obtained in good yields with good to excellent selectivities.