2-Nitrodiphenylamines are reductively cyclized to phenazines by sodium borohydride in ethanolic sodium ethoxide solution: the method has been used to provide the first synthesis of griseoluteic acid and thence of griseolutein A, confirming the allotted structures, and of methyl diacetylgriseolutein B, modifying the suggested structure.
S. R. Challand, R. B. Herbert and F. G. Holliman, J. Chem. Soc. D, 1970, 1423 DOI: 10.1039/C29700001423
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