The mechanism of the hantzsch pyridine synthesis: A study by 15N and 13C NMR spectroscopy
作者:Alan R. Katritzky、Daryl L. Ostercamp、Taher I. Yousaf
DOI:10.1016/s0040-4020(01)88178-3
日期:1986.1
The mechanism of the reactions of ammonia and benzaldehyde with three different beta-dicarbonyl compounds to form the corresponding dihyropyridines has been followed by NMR. In each case the pathway is shown to involve the reaction of benzaldehyde with one molecule of beta-dicarbonyl to give chalcone, and of the ammonia with a second molecule of beta-dicarbonyl to give an enamine. The rate determining
氨和氨与苯甲醛与三种不同的β-二羰基化合物反应形成相应的二氢吡啶的反应机理已通过NMR进行了追踪。在每种情况下,均显示该途径涉及苯甲醛与一个分子的β-二羰基分子反应生成查尔酮,而氨与第二分子的β-二羰基分子反应生成烯胺。速率确定阶段显示为查尔酮向烯胺的迈克尔加成。