Reactions of N-substituted carboxylic acid amides with acylating agents such as acyl halides, phosphoryl chloride, thionyl chloride, and phosgene have been investigated in detail; the adduct formation between N, N-disubstituted formamides and POCl:, has become the basis of the widely used Vilsmeyer-Haack synthesis of aldehydes.'Only few reactions involving substrates containing a C= N bond and acylating agents have been reported. 2 ...
