Abstract
The reaction of 2,5-diamino-3,6-dicyanopyrazine (1) as a new pyrazine raw material with alkyl isocyanate in the presence of sodium hydride gave novel heptahydroirnidazo[4,5-g]pteridine-2,6,8-trione (2), but with tertiary butyl isocyanate gave trihydroimidazo[4,5-b]pyrazine-2-ones (3). Similar reaction of 1 with alkyl thioisocyanate followed by alkyl iodide gave tetrahydropyrimido[4,5-g]pteridines (4). The reac tion of 1 with alkylamine gave the amine-adduct of the cyano groups which was further reacted with arylaldehyde to give the pyrimido[4,5-g]pteridine (10). The products prepared are all of interest as potential pesticides and fluorescent chromophores.
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