J. Chem. Soc., Perkin Trans. 1, 1980, 1139 - 1146
Bicyclic heterocycles with nitrogen at the ring junction. Part 2. Application of the Dakin–West reaction to the synthesis of imidazo[5,1-f]-1,2,4-triazin-4(3H)-ones
Isabel Charles, David W. S. Latham, David Hartley, Alexander W. Oxford and David I. C. Scopes
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http://dx.doi.org/10.1039/P19800001139