Abstract: Carbon subsulfide reacts with 2-aminopyridine 1a and N-phenylbenzamidine
1b to yield the corresponding higher fused dervatives 4 and 7.
Attempts to obtain mesoionic compounds by reaction of N-substituted 2-aminopyridines or
N.N'-disubstituted benzamidines were not successful. Efforts to yield a pyrimidinethione
derivative by reaction with ß-aminocrotonate 1e failed. In this case the
sulfur-bridged compound 8 could be obtained.
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