Treatment of 2-phenyl-(VII and IX) and 2-methyl-4-(4,5-dialkoxy-2-nitrobenzylidene)oxazol-5-ones (VIII and X) with triethyl phosphite afforded the corresponding 2-phenyl-(XI and XIII) and 6,7-dialkoxy-2-methyloxazolo-[5,4-b]quinolines (XII and XIV), respectively, the former of which were hydrolysed to give the 3-benzamido-quinolin-2-ones (XV and XVI).
T. Kametani, T. Yamanaka and K. Ogasawara, J. Chem. Soc. C, 1969, 385 DOI: 10.1039/J39690000385
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