Ammonia → 1-(4-Aminomethylbenzenesulfonyl)piperidine-4-carboxylic acid ethyl ester

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Reaction Steps

[Step 2] To a mixture of 1-(4-cyanobenzenesulfonyl)piperidine-4-carboxylic acid ethyl ester (1.36 g) in ethanol (84 ml) and tetrahydrofuran (14 ml) was added 28% aqueous ammonia (3 ml) and then Raney nickel (500 mg) was added. Under a hydrogen pressure (0.5 Mpa), the mixture was stirred at room temperature for 2 hrs., and undesired substances were removed by filtration. The filtrate was concentrated under reduced pressure to give 1-(4-aminomethylbenzenesulfonyl)piperidine-4-carboxylic acid ethyl ester (1.05 g, 77%).

Provenance & Evidence