Fischer indolisation of 2,6-dialkyl and 2,4,6-trialkylphenylhydrazones of diketones and ketoesters
作者:Shambabu J. Maddirala、Vidya S. Gokak、Sharanabasava B. Rajur、Linganagouda D. Basanagoudar
DOI:10.1016/s0040-4039(03)01364-9
日期:2003.7
Unlike the migration of a methyl group observed in the ZnCl2 or acetic acid-catalysed indolisation of phenylhydrazones, dry ethanolic HCl catalysed indolisation of 2,6-dimethyl- and 2,4,6-trimethylphenylhydrazones of various substituted butane-2,3-diones and ethyl pyruvates yields 7-methyl- and 5,7-dimethyl-3-substituted indoles indicating elimination of an ortho-methyl group during indolisation. (C) 2003 Elsevier Ltd. All rights reserved.