6-Azido-5-formyluracils 2 undergo base catalysed condensation with cyanocarbanions to yield tetrazolo[4′,5′:1,6]pyrido[2,3-d]pyrimidines 4 in good yields.
P. J. Bhuyan, K. C. Lekhok and J. S. Sandhu, J. Chem. Res. (S), 1999, 232 DOI: 10.1039/A808470J
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