Reactions of ketene aminals with n-arylmaleimides and dimethyl acetylenedicarboxylate, a direct pathway to derivatives of pyrrolo[1,2-a]imidazole and imidazo[1,2-a]pyridine
作者:V. D. Orlov、Yu. V. Kharchenko、I. M. Gella、I. V. Omel’chenko、O. V. Shishkin
DOI:10.1007/s10593-012-1123-y
日期:2012.11
N-arylmaleimides or dimethylacetylenedicarboxylate to 2-imidazolideneacetophenones proceeds at the most nucleophilic carbon atom of the acetophenone derivatives and results in a rearrangement to givederivatives of 5-oxo-2,3,5,6-tetrahydro-1H-pyrrolo[1,2-a]imidazole or imidazo[1,2-a]pyridine, respectively. In the case of 2-imidazolidenecyclopentanones and 2-imidazolidine-cyclohexanones, the reaction terminates