Acetonitrile → (3RS,4RS)-3-(2,4-dichlorophenyl)-2-{(1SR,2SR)-2-[(methylsulfonyl)amino]cyclohexyl}-1-oxo-N-{[3-(5-thioxo-4,5-dihydro-1,2,4-oxadiazol-3-yl)benzyl]oxy}-1,2,3,4-tetrahydroisoquinoline-4-carboxamide

Participants

Reaction Steps

To a mixed liquid of 300 mg of (3RS,4RS)—N-({3-[amino(hydroxyimino)methyl]benzyl}oxy)-3-(2,4-dichlorophenyl)-2-{(1SR,2SR)-2-[(methylsulfonyl)amino]cyclohexyl}-1-oxo-1,2,3,4-tetrahydroisoquinoline-4-carboxamide and 30 ml of acetonitrile were added 132 mg of 1,1′-carbonothioyl bis(1H-imidazole) and 0.27 ml of DBU under ice-cooling, followed by stirring at room temperature for 1 hour. The reaction solution was concentrated and then added with 50 ml of water, and 1 M hydrochloric acid was added thereto until the pH reached 4 to 5. After extracting with ethyl acetate, washing with a saturated aqueous sodium chloride solution and drying over anhydrous magnesium sulfate, the solvent was evaporated. The residue was purified by silica gel column chromatography (eluent: chloroform-methanol). The crude purified product thus obtained was added with ethyl acetate and collected by filtration to obtain 61 mg of (3RS,4RS)-3-(2,4-dichlorophenyl)-2-{(1SR,2SR)-2-[(methylsulfonyl)amino]cyclohexyl}-1-oxo-N-{[3-(5-thioxo-4,5-dihydro-1,2,4-oxadiazol-3-yl)benzyl]oxy}-1,2,3,4-tetrahydroisoquinoline-4-carboxamide as a white solid.

Provenance & Evidence