反应详情

Benzyl (3R)-6-(acetylthiomethyl)-5-oxo-1-thia-4-azacyclotetradecane-3-carboxylate (Isomer A), (0.11 g, 0.25 mmol) is dissolved in nitrogen degassed tetrahydrofuran (5 ml) and water (1 ml). Lithium hydroxide monohydrate (0.032 g, 0.75 mmol) is added and the mixture is stirred for 3 hours at room temperature. The mixture is poured into 1N hydrochloric acid and extracted with ethyl acetate (2×50 ml). The combined organic layers are washed with brine (1×50 ml), dried (MgSO4) and the solvent is evaporated. The product is triturated from diethyl ether/hexane (1:1) to give (3R)-6-mercaptomethyl-5-oxo-1-thia-4-azacyclotetradecane-3-carboxylic acid (Isomer A), m.p. 165°-168° C.

1. customdegassed tetrahydrofuran (5 ml) and water (1 ml)
2. extractionextracted with ethyl acetate (2×50 ml)
3. washThe combined organic layers are washed with brine (1×50 ml)
4. dry with materialdried (MgSO4)
5. customthe solvent is evaporated
6. customThe product is triturated from diethyl ether/hexane (1:1)