One-pot two-step tandem reactions for selective synthesis of pyrrolo[2,1-a]isoquinolines and dihydro-, tetrahydro-derivatives
作者:Ying Han、Hong Hou、Qin Fu、Chao-Guo Yan
DOI:10.1016/j.tet.2011.01.046
日期:2011.3
A sequential one-pot two-step tandem reaction for selective and efficient synthesis of pyrrolo[2,1-a]isoquinoline and its dihydro- and tetrahydro-derivatives has been developed. The tandem reactions of isoquinoline, α-halogenated methylene compounds, aromatic aldehydes, and cyanoacetamide firstly give tetrahydropyrrolo[2,1-a]isoquinolines as main products. The corresponding pyrrolo[2,1-a]isoquinolines
已经开发出一种顺序的一锅两步串联反应,用于选择性和高效合成吡咯并[2,1- a ]异喹啉及其二氢和四氢衍生物。异喹啉,α-卤代亚甲基化合物,芳族醛和氰基乙酰胺的串联反应首先以四氢吡咯并[2,1- a ]异喹啉为主要产物。相应的吡咯并[2,1-一个]异喹啉和二氢吡咯并[2,1-一个]异喹啉类可以直接通过与DDQ控制氧化而获得。该串联反应的机理涉及异喹啉基内酯的1,3-偶极环加成是关键步骤。观察到独特地消除了优选氰基的酰胺基。