N-Methyl-4-nitrobenzenesulfonamide → 4-amino-N-methylbenzene-1-sulfonamide

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To a solution of N-methyl-4-nitrobenzenesulfonamide (Step 5) (4.8 g, 22.2 mmol) in methanol (100 ml) in a Parr bottle was added Raney-nickel in methanol. The reaction mixture was flushed with nitrogen and hydrogen several times and maintained under hydrogen at delivery pressure of 5 psi. After stirring at 25° C. for approximately 20 hr, the reaction was vented and purged with nitrogen. The contents of the reaction were filtered and concentrated to remove the solvent. The 4-[(N-methylamino)sulfonyl]aniline obtained as a white solid (4.1 g, 100%) was used in the next step without further purification: mp (DSC) 138° C. Anal Calc'd. for C7H10N2O2S 0.25 H2O: C, 44.08; H, 5.55; N, 14.69. Found: C, 43.83; H, 5.39; N, 14.81.

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