反应详情

A solution of N-(4-benzyloxycarbonyl-2-oxo-1-piperazinyl)-2-[1-(tert-butoxycarbonyl)-4-piperidinyl]acetamide (840 mg) and 10% Pd/C (500 mg) in methanol (35 ml) was stirred at room temperature for 15 hours under a hydrogen atmosphere. The catalyst was filtered off and the reaction mixture was concentrated to obtain N-(2-oxo-1-piperazinyl)-2-[1-(tert-butoxycarbonyl)-4-piperidinyl]acetamide as a colorless syrup. A solution of the resultant 2-[1-(tert-butoxycarbonyl)-4-piperidinyl]-N-(2-oxo-1-piperazinyl)acetamide in ethyl acetate (40 ml) and a 10% aqueous solution of sodium carbonate (40 ml) was combined at 0° C. with 6-chloronaphthalene-2-sulfonyl chloride (470 mg) and stirred at room temperature for 30 minutes. The organic phase was separated, washed with brine, dried and concentrated to obtain a residue, which was purified by a column chromatography on a silica gel (ethyl acetate) and crystallized from ethyl acetate to obtain the title compound (420 mg) as colorless crystals.

1. filtrationThe catalyst was filtered off
2. concentrationthe reaction mixture was concentrated