1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → 1-Oxodihydroisoquinoline-4-carboxamide

Participants

Reaction Steps

To 400 mg of (3RS,4RS)-3-(2,4-dichlorophenyl)-2-{(1SR,2SR)-2-[(mesyl)amino]cyclohexyl}-1-oxo-1,2,3,4-tetrahydroisoquinoline-4-carboxylic acid were added 8 ml of DMF, 243 mg of O-[3-(tetrahydro-2H-pyran-2-yl oxy)benzyl]hydroxylamine, 159 mg of HOBt, and 243 mg of WSC, followed by stifling at room temperature for 3 hours. The reaction solution was added with ethyl acetate and water to carry out a liquid separation operation, and 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. To the residue was added methanol, and concentrated hydrochloric acid was added dropwise thereto under ice-cooling, followed by stirring under ice-cooling for 1 hour. The precipitated crystal was collected by filtration to obtain 275 mg of (3RS,4RS)-3-(2,4-dichlorophenyl)-N-[(3-hydroxybenzyl)oxy]-2-{(1SR,2SR)-2-Rmesyl)amino]cyclohexyl}-1-oxo-1,2,3,4-tetrahydroisoquinoline-4-carboxamide as a white crystal.

Provenance & Evidence