Orthoamides and iminium salts LXXVII 1 cycloadditions to N, N, N′ , N′ , N″ , N″ , N? , N? -octamethylacetylenedicarboxamidinium bis(tetrafluoroborate): A new synthetic method for the preparation of heterocyclic dicarboxamidinium salts

摘要

The new, hitherto unknown, heterocyclic 1,2-dicarboxamidinium salts were prepared from N′,N′,N′,N′,N″,N″,N?, N?-octamethylacetylenedicarboxamidinium bis(tetrafluoroborate) and benzyl azide, C-phenyl-N-methylnitrone, (ethoxycarbonyl)pyridiniomethanide (prepared in situ from N-[(ethoxycarbonyl)methyl]pyridinium bromide), aromatic o-hydroxycarbaldehydes salicylaldehyde and 2-hydroxy-1-naphthaldehyde, 2-[(phenylimino)methyl]phenol, methyl salicylate, and phenyldiazomethane.