29873-09-4Relevant articles and documents
1, 2, 3, 9-tetrahydro-4H-carbazol-4-one and 8, 9-dihydropyrido- [1, 2-a]indol-6(7H)-one from 1H-indole-2-butanoic acid
Bunce, Richard A.,Nammalwar, Baskar
experimental part, p. 172 - 177 (2009/07/17)
Efficient syntheses of the title ring systems have been developed from 1H-indole-2-butanoic acid, which was easily prepared from 2-fluoro-1- nitrobenzene in four steps. Heating 1H-indole-2-butanoic acid in toluene containing p-toluenesulfonic acid at 110°