tert-Butyl carbazate → HCID 72303809, compound

Participants

Reaction Steps

To 591 mg of [({[(3RS,4RS)-3-(2,4-dichlorophenyl)-2-{(1SR,2SR)-2-[(methylsulfonyl)amino]cyclohexyl}-1-oxo-1,2,3,4-tetrahydroisoquinolin-4-yl]carbonyl}amino)oxy]acetic acid were added 8 ml of DMF, 200 mg of tert-butyl hydrazinecarboxylate, 205 mg of HOBt, and 388 mg of WSC hydrochloride, followed by stirring at room temperature for 3 hours. Ethyl acetate and water were added thereto to carry out a liquid separation operation. The organic layer was washed with a saturated aqueous sodium hydrogen carbonate solution and a saturated aqueous sodium chloride solution, dried over anhydrous magnesium sulfate, and then evaporated under reduced pressure. 7.7 ml of dichloromethane was added thereto, followed by cooling to 0° C., and 1.2 ml of trifluoroacetic acid was added thereto, followed by stirring at room temperature for 5 hours. The residue was purified by silica gel column chromatography (eluent: chloroform-methanol) and recrystallized from ethyl acetate to obtain 417 mg of (3RS,4RS)-3-(2,4-dichlorophenyl)-N-(2-hydrazino-2-oxoethoxy)-2-{(1SR,2SR)-2-[(methylsulfonyl)amino]cyclohexyl}-1-oxo-1,2,3,4-tetrahydroisoquinoline-4-carboxamide as a white powder crystal.

Provenance & Evidence