反应详情

To 4.33 g of (3RS,4RS)-2-[(1SR,2SR)-2-aminocyclohexyl]-3-(2,4-dichlorophenyl)-1-oxo-1,2,3,4-tetrahydroisoquinoline-4-carboxylic acid were added 50 ml of ethanol and 2 ml of concentrated sulfuric acid, followed by heating under reflux overnight. Ethyl acetate and water were added thereto 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. The organic layer was dried over anhydrous sodium sulfate and then evaporated under reduced pressure. The residue was purified by silica gel column chromatography (eluent: hexane-ethyl acetate) to obtain 2.3 g of ethyl (3RS,4RS)-2-[(1SR,2SR)-2-aminocyclohexyl]-3-(2,4-dichlorophenyl)-1-oxo-1,2,3,4-tetrahydroisoquinoline-4-carboxylate as a yellow foam.

1. temperatureby heating
2. temperatureunder reflux overnight
3. customa liquid separation operation
4. washthe organic layer was washed with a saturated aqueous sodium hydrogen carbonate solution
5. dry with materialThe organic layer was dried over anhydrous sodium sulfate
6. customevaporated under reduced pressure
7. customThe residue was purified by silica gel column chromatography (eluent: hexane-ethyl acetate)