反应详情

Under nitrogen atmosphere, methanol (1.60 g, 50.5 mmol) was added drop-wise to a suspension of LiBH4 (1.10 g, 50.5 mmol) in dichloromethane (20 mL) at rt. A solution of 5-(4-ethoxycarbonyl-4-phenyl-pentylsulfanyl)-2-methyl-2-phenyl-pentanoic acid ethyl ester (7.75 g, 16.5 mmol) in dichloromethane (100 ml) was added drop-wise at gentle reflux. The mixture was stirred under reflux for 16 h, then cooled to rt and carefully hydrolized with 2 N hydrochloric acid (50 mL) and saturated ammonium chloride solution (100 mL). The aqueous layer was extracted with dichloromethane (2×150 mL). The combined organic layers were washed with water (2×100 mL) and dried over anhydrous MgSO4. The filtrate was evaporated to yield the crude product (5.55 g) as a colorless, viscous oil. This residue was purified repeatedly by column chromatography on silica gel (120 g, first with dichloromethane/ethyl acetate=1:1, second with dichloromethane/ethyl acetate=7/1), and dried at 100° C. for 2.5 h under high vacuo to give 5-(5-hydroxy-4-methyl-4-phenylpentylsulfanyl)-2-methyl-2-phenylpentan-1-ol (3.06 g, 41%) as a colorless viscous oil. 1H NMR (300 MHz, CDCl3/TMS): d (ppm): 7.30 (m, 8H), 7.20 (m, 2H), 3.65 (m, 2H), 3.50 (m, 2H), 2.32 (m, 4H), 1.82 (dt, J=3.9, 9.6 Hz, 2H), 1.60-1.37 (m, 6H), 1.32 (s, 6H), 1.20-1.25 (m, 2H). 13C NMR (75 MHz, CDCl3/TMS): d (ppm): 144.58, 128.60, 126.81, 126.35, 72.56, 43.42, 37.60, 32.74, 32.71, 23.93, 23.91, 21.6. HRMS (LSIMS, gly): Calcd. for C24H35O2S (MH+): 387.2358, found: 387.2350.

1. temperatureunder reflux for 16 h
2. extractionThe aqueous layer was extracted with dichloromethane (2×150 mL)
3. washThe combined organic layers were washed with water (2×100 mL)
4. dry with materialdried over anhydrous MgSO4
5. customThe filtrate was evaporated
6. customto yield the crude product (5.55 g) as a colorless, viscous oil
7. customThis residue was purified repeatedly by column chromatography on silica gel (120 g
8. dry with materialfirst with dichloromethane/ethyl acetate=1:1, second with dichloromethane/ethyl acetate=7/1), and dried at 100° C. for 2.5 h under high vacuo