作者:Olivier J.-C Nicaise、Douglas M Mans、Andrew D Morrow、Emilio Villa Hefti、Elizabeth M Palkovacs、Rajesh K Singh、Malgorzata A Zukowska、Matthew D Morin
DOI:10.1016/s0040-4020(03)01065-2
日期:2003.8
remarkably stable enol from the reaction of EtMgBr with a 1,2-diester was accidentally discovered. This compound was spectroscopically characterized (1H and 13C NMR, IR), and both methyl carbonate and trimethylsilyl ether derivatives were prepared. A mechanism for the selective formation of the stable enol ester and its corresponding keto form was suggested, and the kinetic stability of the enol was also
偶然发现了EtMgBr与1,2-二酯反应生成的温度稳定的烯醇。对该化合物进行了光谱表征(1 H和13制备1 H NMR和IR,以及碳酸甲酯和三甲基甲硅烷基醚衍生物。提出了选择性形成稳定的烯醇酯及其相应的酮形式的机理,并且还记录了烯醇的动力学稳定性。使用其他格氏试剂以及其他1,2-二酯证明了对这种稳定的烯醇酯的观察的普遍性。EtMgBr与一系列1,2-酰胺酯的反应也产生稳定的烯醇酰胺。烯醇酯的显着稳定性归因于这些化合物的芳基酯部分中存在的空间位阻,进一步的研究将探讨这种作用的起源。