alpha-(4-antipyryl)amino-(substituted)phenymethylphosphonic acid diesters (
2) were synthesized by the addition of phosphite diesters to corresponding
imine (1). A five-member cyclic transition state was proposed, and the infl
uence of substituents on the reactivity of substrate was discussed. The net
atomic charges of some imine 1 was calculated to support the mechanism. In
the presence of NaI or KI, the cleavage of methyl esters of 2a and 2e vere
realized by trimethyl silylition of 2 with trimethylchlorosilane. The stru
ctures of the compounds were confirmed by H-1 NMR spectroscopy.