Aminolysis of Y-Substituted Phenyl X-Substituted Cinnamates and Benzoates: Effect of Modification of the Nonleaving Group from Benzoyl to Cinnamoyl
作者:Ik-Hwan Um、Youn-Min Park、Mizue Fujio、Masaaki Mishima、Yuho Tsuno
DOI:10.1021/jo0705061
日期:2007.6.1
4-dinitrophenyl X-substituted cinnamates (1a, 1c, and 1e) with amines are curved with a decreasing βnuc value from 0.65 to 0.3−0.4. The reactions of Y-substituted phenyl cinnamates (3a−g) with morpholine also result in a curved Brønsted plot, while the corresponding reactions of Y-substituted phenyl benzoates (4a−e) exhibit a linear Brønsted plot. It has been concluded that the curved Brønsted plots found
动力学研究报道了Y取代的苯基X取代的肉桂酸酯(1a - e和3a - g)和苯甲酸酯(2a - e和4a - g)与一系列脂环族仲胺在80 mol%H 2 O中的反应/ 20 mol%DMSO在25.0±0.1°C下。2,4-二硝基苯基X-取代的肉桂酸酯(1a - e)和苯甲酸酯(2a - e)与胺的反应产生线性的Yukawa-Tsuno图。的ρ X值是的反应小得多1A - ë比2a - e的要大。的距离效应和反应机理(即,用于协同机制的性质1A - ë)已被建议来负责小ρ X值。2,4-二硝基苯基X-取代的肉桂酸酯(1a,1c和1e)与胺反应的布朗斯台德图是弯曲的,其βnuc值从0.65降低到0.3-0.4。Y取代的苯基肉桂酸酯(3a - g)与吗啉的反应也产生弯曲的布朗斯台德图,而Y取代的苯基苯甲酸酯(4a− e)表现出线性布朗斯台德图。已经得出结论,对于肉桂酸酯(1a,1c,1e和3a