Abstract

2-(Substituted amidino)acetamides and their 2-phenylazo-derivatives were cyclised with one-carbon-atom reagents to the corresponding pyrimidin-4(3H)-ones, identified by unambiguous synthesis from 4,6-dichloropyrimidine and by conversion into the corresponding 9-substituted hypoxanthines. The cyclisation of 2-(substituted amidino)-2-formamidoacetamide formate and hydrochloride salts to the isomeric ring and exocyclic N-substituted aminoimidazolecarboxamides was studied. The imidazolecarboxamides were converted, where possible, into the 3- or 9-substituted hypoxanthines.

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