作者:P. de Medina、L. S. Ingrassia、M. E. Mulliez
DOI:10.1021/jo034229j
日期:2003.10.1
Three methods were selected for the one-pot synthesis of the fully protected beta-fluoroaminophosphonic acids, using the readily accessible N-protected beta-fluoroaminals. These were activated by acylation leading, by beta-elimination, to a transient N-acylimine immediately trapped by reactive forms of dialkyl phosphites. Avoiding basic conditions, the complete or partial deprotection of these N-protected
选择了三种方法,使用容易获得的N保护的β-氟代氨基缩醛一锅合成完全保护的β-氟代氨基膦酸。这些通过酰化作用被活化,通过β-消除作用导致瞬时的N-酰亚胺基立即被反应性形式的亚磷酸二烷基酯捕获。避免碱性条件,这些N-保护的β-氟氨基膦酸酯的全部或部分脱保护使得可以合成游离氨基酸,其酯和外消旋的β-三氟膦酰胺酸。后者代表由细菌转肽酶形成的过渡态类似物,与非氟化化合物相反,它在pH 4.7时是完全稳定的。