Efficient Formation of a Triazole Ring via Novel Ring-Opening Reaction of (Z)-2-Methyl-4-arylmethylene-5(4H)-oxazolones with Hydrazides
作者:Tadamitsu Sakurai、Kei Maekawa、Atsushi Tomoda、Tetsutaro Igarashi
DOI:10.3987/com-08-11457
日期:——
mechanistic points of view. It was found that the novel ring-opening reaction proceeded to give (Z)-2-(3-methyl-5-substituted 1,2,4-triazol-4-yl)-3-aryl-2-propenoic acids (1,2,4-triazole-substituted (Z)-α-dehydroarylalanines| as major products, along with minor or negligible amounts of their isomers. Substituent and solvent effects on the relative composition of these two isomers confirmed that this
从合成和机理的角度研究了标题恶唑酮与酰肼亲核试剂的开环模式。发现新的开环反应进行得到(Z)-2-(3-甲基-5-取代的1,2,4-三唑-4-基)-3-芳基-2-丙烯酸(1 ,2,4-三唑取代的 (Z)-α-脱氢芳基丙氨酸|作为主要产物,以及少量或可忽略不计的异构体。取代基和溶剂对这两种异构体的相对组成的影响证实了该组成取决于空间位阻芳基(在恶唑酮中)和酰基(在酰肼亲核试剂中)取代基以及溶剂极性的电子因素。