反应详情

To a solution of [3-(S)-benyloxycarbamoyl-4-(S)-(4-phenyl-piperazine-1-carbonyl)-cyclohexyl]-acetic acid methyl ester (213 mg, 0.432 mmol) in THF (5 mL) was added water (3 mL) and lithium hydroxide (40 mg, 0.95 mmol). After stirring at ambient temperature for 4 h, the reaction mixture was acidified with 1 N HCl to a pH of ca. 5. The product was extracted with ethyl acetate (4×5 mL) and the combined organic layers were washed with brine (5 mL), dried (NaSO4), and the volatiles were removed in-vacuo to afford 154 mg (87%) of [3-(S)-benyloxycarbamoyl-4-(S)-(4-phenyl-piperazine-1-carbonyl)-cyclohexyl]-acetic acid as a sticky oil that was used without further purification in the following coupling reaction. MS (ESI): 480 (M+H+).

1. extractionThe product was extracted with ethyl acetate (4×5 mL)
2. washthe combined organic layers were washed with brine (5 mL)
3. dry with materialdried (NaSO4)
4. customthe volatiles were removed in-vacuo