Hydrochloric Acid → (2S)-(4-carboxythiazol-2-ylthio)-N-{[4-(3,4-dichlorobenzyl)morpholin-2-yl]methyl}acetamide

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Reaction Steps

The resultant product (850 mg) of (1-4) was dissolved in methanol (4 mL) and tetrahydrofuran (4 mL), 1 mol/L aqueous sodium hydroxide solution (4 mL) was added, and the mixture was stirred overnight at room temperature. 1 mol/L hydrochloric acid was added to the reaction mixture, and the organic solvent alone was evaporated under reduced pressure. Saturated brine was added to the obtained residue, and the mixture was extracted with a mixed solvent of chloroform-methanol. The extract was dried over anhydrous sodium sulfate, and the solvent was evaporated under reduced pressure. The obtained residue was purified by silica gel column chromatography using a mixed solvent of chloroform and methanol as an eluent. The solvent was evaporated from the eluent to give the title compound (479 mg) as a white solid.

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