Abstract
The conversion of pyrimido[5,4-e]-1,2,4-triazinediones to imidazo[4,5-e]-1,2,4-triazinones is a multistage process including the hydrolysis of the C(5)-N(6) amide bond, the closure of the ureido group to the imidazolidinone ring, decarboxylation, acid oxidation.
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