A nucleophilic reaction of 2-aminopyridines (or 2-aminoheterocycles) with ethoxymethylenemalononitrile was investigated and structures of the reaction products were assigned as shown in Table II. Similar reactions using 2-aminopyridine hydrochloride were found to give 1, 2-dihydro-1- (2, 2-dicyanovinyl) -2-iminopyridine (IV), and 1, 2-dihydro-1- (2, 2-dicyanovinyl) -2- (2, 2-dicyanovinylimino) pyridine (VIa).
