Water → ethyl (3RS,4RS)-3-(2,4-dichlorophenyl)-2-{(1SR,2SR)-2-[methyl(methylsulfonyl)amino]cyclohexyl}-1-oxo-1,2,3,4-tetrahydroisoquinoline-4-carboxylate

Participants

Reaction Steps

To a solution of 1.4 g of ethyl(3RS,4RS)-3-(2,4-dichlorophenyl)-2-{(1SR,2SR)-2-[(methylsulfonyl)amino]cyclohexyl}-1-oxo-1,2,3,4-tetrahydroisoquinoline-4-carboxylate in 20 ml of DMF was added 229 mg of sodium hydride under ice-cooling, followed by stirring at the same temperature for 10 minutes, and then 0.17 ml of methyl iodide was added thereto, followed by stirring under ice-cooling for 30 minutes. Water was added thereto, followed by extraction with ethyl acetate. The organic layer was washed with a saturated aqueous sodium chloride solution and dried over anhydrous sodium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (eluent:chloroform-methanol) to obtain 545 mg of ethyl(3RS,4RS)-3-(2,4-dichlorophenyl)-2-{(1SR,2SR)-2-[methyl(methylsulfonyl)amino]cyclohexyl}-1-oxo-1,2,3,4-tetrahydroisoquinoline-4-carboxylate as a colorless amorphous substance.

Provenance & Evidence