P<sub>4</sub>O<sub>10</sub>/TfOH mediated domino condensation–cyclization of amines with diacids: a route to indolizidine alkaloids under catalyst- and solvent-free conditions
作者:Ketan S. Mandrekar、Santosh G. Tilve
DOI:10.1039/d2ra02534e
日期:——
employment of either a catalyst or solvent. The use of a few aliphatic and aromatic dicarboxylic acids is shown along with various primary amines. This method is suitable for synthesizing pyrrolo[2,1-a]isoquinolines, pyrido[2,1-a]isoquinolines, and isoindolo[1,2-a]isoquinolinones in excellent yields. When phthalic acid is used, a workup with either NaBH4 or a saturated NaHCO3 solution provided 12b-H or 12b-OH
开发了一种多米诺缩合环化方法,使用 P 4 O 10 /TfOH 试剂系统合成吲哚里西啶生物碱,无需使用催化剂或溶剂。显示了一些脂肪族和芳香族二羧酸以及各种伯胺的使用。该方法适用于合成吡咯并[2,1- a ]异喹啉、吡啶并[2,1- a ]异喹啉和异吲哚[1,2- a ]异喹啉酮,收率良好。当使用邻苯二甲酸时,使用 NaBH 4或饱和 NaHCO 3溶液进行后处理得到 12 b -H 或 12 b -OH 异吲哚[1,2- a]异喹啉酮,分别。