Treatment of 5-benzylidene-6-(N-substituted amino)uracils with diethyl azodiformate led to the formation of the corresponding pyrimido[4,5-b]quinoline-2(3H),4(10H)-diones (5-deazaflavins).
K. Mori, K. Shinozuka, Y. Sakuma and F. Yoneda, J. Chem. Soc., Chem. Commun., 1978, 764 DOI: 10.1039/C39780000764
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