Transformations of methyl 2-(2,2-disubstituted-ethenyl)amino-3-dimethylaminopropenoates. The synthesis of methyl 1-heteroaryl-1H-imidazole-4-carboxylates

Transformations of intermediates 4, prepared from methyl 2-(2,2-disubstituted-ethenyl)amino-3-dimethylaminopropenoates 2 and sterically hindered heteroarylamines 3, into methyl 1-heteroaryl-1H-imidazole-4-carboxylates 7 are described.