Fischer indolisation of ethyl 2-hydroxyphenylketone phenylhydrazone affords 2-(2-hydroxyphenyl)-3-methyl-indole which is readily autoxidised to 3-hydroxy-2-(2-hydroxyphenyl)-3-methyl-3H-indole. This smooth autoxidation is dependent upon the presence of the phenolic hydroxy-group at the 2-position of the 2-phenyl substituent.
B. Robinson and M. U. Zubair, J. Chem. Soc. C, 1971, 976 DOI: 10.1039/J39710000976
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