Regioselective Synthesis of C-3-Functionalized Quinolines via Hetero-Diels–Alder Cycloaddition of Azadienes with Terminal Alkynes
作者:Rakesh K. Saunthwal、Monika Patel、Akhilesh K. Verma
DOI:10.1021/acs.joc.6b01186
日期:2016.8.5
C-3-functionalized quinolines from azadienes (in situ generated from 2-aminobenzyl alcohol) and terminal alkynes through [4 + 2] cycloaddition has been developed. An unprecedented reaction of 2-aminobenzyl alcohol with 1,3- and 1,4-diethynylbenzene provided the C-3 tolylquinolines via [4 + 2] HDA and oxidative decarboxylation. The −NH2 group directed mechanistic approach was well supported by the control experiments
已经开发了一种高效的金属和无保护方法,用于通过[4 + 2]环加成反应从氮杂二烯(由2-氨基苄醇原位生成)和末端炔烃区域选择性合成C-3-官能化喹啉。2-氨基苄醇与1,3-和1,4-二乙炔基苯的空前反应通过[4 + 2] HDA和氧化脱羧作用提供了C-3甲苯基喹啉。对照实验和氘标记研究以及通过分离氮杂二烯中间体,都很好地支持了-NH 2基团指导的机理研究。利用无保护的氮杂二烯在无金属碱辅助的杂Diels-Alder反应中的反应性和选择性,可以快速组装一类很难接近的重要的C-3-官能化喹啉。