Heterocycles with a bridging nitrogen atom. 15. The novel recyclization of dipyrido[1,2-a:1′,2′-c]-imidazolium salts to pyrido[1,2-a]-benzimidazole-8-carboxaldehydes
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Add time:09/29/2019 Source:infona.pl
A previously unknown recyclization of an 11-acyldipyrido[1,2-a:1′,2′-c]imidazolium cation to 8-formyl-9-methyl(aryl)pyrido[1,2-a]benzimidazoles has been discovered. The proposed reaction mechanism includes a selective opening of one of the pyridinium rings and the formation of a benzaldehyde fragment via condensation of the intermediate with the participation of the acyl group.
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