Ammonia → 2-Methyl-5-nitro-4-(4-o-tolyl-piperazin-1-yl)-benzamide

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To a stirred solution of 2-methyl-5-nitro-4-(4-o-tolyl-piperazin-1-yl)-benzoic acid (6.2 g, 17.4 mmol) in anhydrous dichloromethane (170 mL), 1,1′-carbonyldiimidazole (7.07 g, 43.6 mmol) was added at 0° C. under N2 atmosphere. The reaction mixture was allowed to stir at room temperature for 2 h. Where upon a solution of ammonia in THF (≈4M) was added slowly at 0° C. under N2 atmosphere. The reaction mixture was allowed to stir at room temperature overnight. After the completion of the reaction as monitored by the TLC, solvent was removed in vacuo. Residue obtained was diluted with dichloromethane/methanol (150 mL, 9:1 by volume), and washed with water. Aqueous layer was again extracted in dichloromethane/methanol (3×50 mL). The combined extract was washed with brine solution and dried over anhydrous Na2SO4. The solvent was evaporated under reduced pressure to afford the pure product 2-methyl-5-nitro-4-(4-o-tolyl-piperazin-1-yl)-benzamide. Yield (6.0 g, 97%; and yellow solid).

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