for N-acyl imines of trichloropyruvates [2-(acylimino)-3,3,3-trichloropropanoates] based on consecutive silylation-chlorinative desilylation of readily accessible α-(acylamino)-substituted dichloroacrylates was developed. The use of the 2-iminopropanoates obtained for the amidoalkylation of S-, O-, N-, and C-centered nucleophiles to afford amino acids derivatives is disclosed. N-acyl imines - enamides