Procedures for the preparation of 6-chloro-2,3,4,9-tetrahydro-1H-carbazol-1-carboxamide and their precursors

A process for preparing the compound (I'-b) according to the following scheme: ** ** Formula wherein R is linear alkyl chain, branched or cyclic, C1-C6, preferably acetate, said process being characterized by that reaction between (I'-a) and 4-chloroaniline is performed under heating in a solvent which forms an azeotrope with water.