A systematic study of reaction of heterocyclic enamines with electrophilic alkynes: a simple and efficient synthetic route to 2-pyridinone-fused heterocycles
作者:Mei-Xiang Wang、Wei-Shi Miaoa、Ying Cheng、Zhi-Tang Huang
DOI:10.1016/s0040-4020(99)00937-0
日期:1999.12
The reaction of heterocyclic enamines with ethyl propiolate and diethyl acetylenedicarboxylate has been systematically studied. In contrast to their heterocyclic ketene aminal analogues, heterocyclic enamines reacted with electrophilic alkynes via the Michael addition pathway rather than the aza-ene reaction mechanism. In the presence of a strong base such as sodium ethoxide and sodium hydride, the
已经系统地研究了杂环烯胺与丙酸乙酯和乙炔二羧酸二乙酯的反应。与它们的杂环烯酮氨基类似物相反,杂环烯胺通过迈克尔加成途径而不是氮杂-烯反应机理与亲电炔烃反应。在强碱如乙醇钠和氢化钠的存在下,所得的迈克尔加成产物容易进行环缩合反应,以良好的至优异的产率产生2-吡啶酮-稠合的杂环。