The condensation of diethyl phosphonate carbanions, prepared from α-bromo-esters, -nitriles, or -ketones, with 4,6-diamino-5-nitrosopyrimidines constitutes a versatile and unequivocal route to pteridin-7(8H)-ones, 7-aminopteridines, and 7-alkyl- or aryl-pteridines.
E. C. Taylor and B. E. Evans, J. Chem. Soc. D, 1971, 189 DOI: 10.1039/C29710000189
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