Annulation chemistry based on tandem Michael addition-enamine formation – An improved method for the preparation of 1-substituted-2,3,5,6,7,8-hexahydroquinolin-4(1H)-ones
作者:Andrew Glass、Tyler Higgins、David A. Hunt
DOI:10.1016/j.tetlet.2019.151158
日期:2019.10
The reaction of 2-(but-2-enoyl)cyclohexan-1-one 2 with primary amines affords 1-substituted-2,3,5,6,7,8-hexahydroquinolin-4(1H)-ones through a tandem Michael addition/enamine formation reaction sequence at room temperature in high yields. Reaction times are greatly reduced (4–24 h vs. 1–2 h; reflux versus room temperature) when powdered 4 Å sieves are used.
2-(but-2-enoyl)cyclohexan-1-one 2与伯胺的反应通过串联反应获得1-取代的2,3,5,6,7,8-六氢喹啉-4(1 H)-在室温下以高收率的迈克尔加成/烯胺形成反应顺序。当使用4Å粉末筛网时,反应时间大大减少(4-24小时vs.1-2小时;回流相对于室温)。