Synthesis and Comparative Study on the Reactivity of Peptidyl-Type Phosphinic Esters: Intramolecular Effects in the Alkaline and Acidic Cleavage of Methyl β-Carboxyphosphinates
作者:Dimitris Georgiadis、Vincent Dive、Athanasios Yiotakis
DOI:10.1021/jo0156363
日期:2001.10.1
Using the phosphinic analogue of Cbz-Phe-Gly-OEt 1a as a template for this study, several phosphinic esters (2a-g) were prepared, employing an efficient method for each case. The reactivity of these derivatives under conventional deprotection conditions was studied, and the results are listed comparatively. The effect of steric hindrance as well as the contribution of neighboring groups in the rate
使用Cbz-Phe-Gly-OEt 1a的次膦酸酯类似物作为模板进行本研究,制备了几种次膦酸酯(2a-g),每种情况均采用有效方法。研究了这些衍生物在常规脱保护条件下的反应性,并比较列出了结果。检查空间位阻的影响以及相邻基团在酸性和碱性脱保护条件下适当地选择的β-carboxyphosphinates的水解速率的贡献。结果清楚地表明,由于五元混合酸酐类型物质的中介作用,次膦酸酯裂解显着加速。这受以下观察结果的支持:在受阻α-羧基次膦酸酯同源衍生物的情况下未观察到相似的相互作用。