2-Nitro-5-piperidin-1-yl-benzoic acid ethyl ester → 2-Amino-5-piperidin-1-yl-benzoic acid ethyl ester

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Reaction Steps

Subsequently, the crude 2-nitro-5-piperidin-1-yl-benzoic acid ethyl ester (3.8 g) was dissolved in methanol (35 ml). Platinum oxide (300 mg) was added to the solution at room temperature, the air in the reaction system was replaced by hydrogen, and the mixture was then stirred for 12 hr. After the completion of the reaction, the atmosphere in the reaction system was replaced by nitrogen, and the reaction solution was then filtered through Celite to remove platinum oxide and was then concentrated under the reduced pressure to give crude 2-amino-5-piperidin-1-yl-benzoic acid ethyl ester (compound A) as a useful intermediate (3.4 g, crude yield 100%).

Provenance & Evidence