4-sulfanylbutan-1-ol

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of naproxen (5.03 g, 21.9 mmol), 4-mercapto-l-butanol (2.32 g, 21.9 mmol) and N,N-dimethylaminopyridine (DMAP) (0.534 g, 4.37 mmol) in dichloromethane (200 mL) at room temperature was added 1-(3-(dimethylamino)propyl)-3-ethylcarbodiimide hydrochloride (EDAC) (5.03 g, 26.2 mmol) as a solid, in portions. The reaction mixture was stirred for 3 hours at room temperature, then partitioned between dichloromethane and water, and the water layer was washed with more dichloromethane. The combined organic layer was washed with water and brine, then dried over magnesium sulfate. The solution was concentrated under vacuum, and the residue was purified via column chromatography, 50% ethyl acetate/hexane. The appropriate fractions were combined, and the solvent removed by rotary evaporation to give an oil, 2.647 g, which contained 19% 4-mercapto-l-butanol by weight (product weight 2.07 g, 6.5 mmol, 30% yield): 1H NMR (300 MHz, CDCl3) δ 7.73 (d, J=2.7 Hz, 1H), 7.71 (d, J=2.3 Hz, 1H), 7.69 (d, J=1.0 Hz, 1H), 7.40 (dd, J=1.8, 8.5 Hz, 1H), 7.15 (dd, J=2.5, 8.8 Hz, 1H), 7.12 (d, J=2.3 Hz, 1H), 4.02 (q, J=7.1 Hz, 1H), 3.92 (s, 3H), 3.61-3.64 (m, 2H), 2.87 (m, 2H), 1.61 (d, J=7.1 Hz, 3H), 1.59 (m, 2H), 1.41 (m, 2H); mass spectrum (API-TIS) m/z 319 (M+H+), 336 (M+18+). partitioned between dichloromethane and water the water layer was washed with more dichloromethane The combined organic layer was washed with water and brine dried over magnesium sulfate The solution was concentrated under vacuum the residue was purified via column chromatography, 50% ethyl acetate/hexane the solvent removed by rotary evaporation to give an oil, 2.647 g, which

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2.80 g (12.2 mmoles) of 4(R)-t-butyldimethylsilyloxy-2,3-epoxycyclopentanone and 1.30 g (12.2 mmoles) of 4-mercaptobutan-1-ol were dissolved in 12 ml of methanol, and with stirring 1.87 ml (13.5 mmoles) of triethylamine was added. The stirring was continued for 30 minutes. Ten milliliters of a saturated aqueous solution of ammonium chloride was added, and the mixture was concentrated. The residue was extracted with ethyl acetate, dried over anhydrous magnesium sulfate, filtered and concentrated. The resulting oily product was chromatographed on a silica gel column using hexane/ethyl acetate (8/1) as an eluent to give 3.12 g (81%) of 4(RS)-t-butyldimethylsilyloxy-2-(4-hydroxybutylthio)-2-cyclopentenone. was added the mixture was concentrated The residue was extracted with ethyl acetate dried over anhydrous magnesium sulfate filtered concentrated The resulting oily product was chromatographed on a silica gel column

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To 40 ml of a methanol solution of sodium methoxide (1 M solution) are added 3.1 g of 4-mercaptobutanol and 0.5 g of sodium borohydride, to which is added dropwise a solution of 4.36 g of 2-methoxy-3-octadecyloxypropyl methanesulfonate in 40 ml of tetrahydrofuran at room temperature with stirring. The mixture is stirred at room temperature for 14 hours and then at 40° C. for 1.5 hours. The solvent is distilled off under reduced pressure and the residue is acidified with hydrochloric acid and extracted with hexane. The extract layer is washed with water, dried and concentrated to leave crude 2-methoxy-3-octadecyloxypropyl 4-hydroxybutyl sulfide. This sulfide is dissolved in 75 ml of dichlromethane, to which 7.6 g of m-chloroperbenzoic acid is added little by little at room temperature with stirring. The mixture is then stirred at room temperature for 1 hour and is filtered to remove precipitates. The filtrate is washed with an aqueous sodium sulfite solution, an aqueous sodium bicarbonate solution and water, dried and concentrated to leave a residue which in turn is purified by silica gel column chromatography to obtain 2.5 g of the captioned compound. The mixture is stirred at room temperature for 14 hours The solvent is distilled off under reduced pressure extracted with hexane The extract layer is washed with water dried concentrated

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 4-mercaptobutanol (4.936 g) in dry acetonitrile under argon was cooled to 0° C. and sodium hydride (60% in mineral oil, 2.044 g) was added portionwise. The mixture was stirred for 1 hour at 0° C. then 2-(2-bromoethyl)-1,3-dioxolane (9.26 g) was added and the resultant grey suspension was warmed to room temperature and stirred overnight. The reaction was quenched by addition of saturated aqueous sodium bicarbonate solution (150 mL) and then extracted with ethyl acetate (3×150 mL). The organics were combined and washed with brine (150 mL), dried over sodium sulfate, filtered and dried to afford the crude product. Purification was by silica gel chromatography eluting with 0-50% ethyl acetate in cyclohexane to afford the subtitled compound as a yellow oil. Yield 7.3 g. the resultant grey suspension was warmed to room temperature stirred overnight The reaction was quenched by addition of saturated aqueous sodium bicarbonate solution (150 mL) extracted with ethyl acetate (3×150 mL) washed with brine (150 mL) dried over sodium sulfate filtered dried to afford the crude product Purification eluting with 0-50% ethyl acetate in cyclohexane

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 4-mercaptobutanol (4.936 g) in dry acetonitrile under argon was cooled to 0° C. and sodium hydride (60% in mineral oil, 2.044 g) was added portionwise. The mixture was stirred for 1 hour at 0° C. then 2-(2-bromoethyl)-1,3-dioxolane (9.26 g) was added and the resultant grey suspension was warmed to room temperature and stirred overnight. The reaction was quenched by addition of saturated aqueous sodium bicarbonate solution (150 mL) and then extracted with ethyl acetate (3×150 mL). The organics were combined and washed with brine (150 mL), dried over sodium sulfate, filtered and dried to afford the crude product. Purification was by silica gel chromatography eluting with 0-50% ethyl acetate in cyclohexane to afford the subtitled compound as a yellow oil. Yield 7.3 g. the resultant grey suspension was warmed to room temperature stirred overnight The reaction was quenched by addition of saturated aqueous sodium bicarbonate solution (150 mL) extracted with ethyl acetate (3×150 mL) washed with brine (150 mL) dried over sodium sulfate filtered dried to afford the crude product Purification eluting with 0-50% ethyl acetate in cyclohexane

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of naproxen (5.03 g, 21.9 mmol), 4-mercapto-l-butanol (2.32 g, 21.9 mmol) and N,N-dimethylaminopyridine (DMAP) (0.534 g, 4.37 mmol) in dichloromethane (200 mL) at room temperature was added 1-(3-(dimethylamino)propyl)-3-ethylcarbodiimide hydrochloride (EDAC) (5.03 g, 26.2 mmol) as a solid, in portions. The reaction mixture was stirred for 3 hours at room temperature, then partitioned between dichloromethane and water, and the water layer was washed with more dichloromethane. The combined organic layer was washed with water and brine, then dried over magnesium sulfate. The solution was concentrated under vacuum, and the residue was purified via column chromatography, 50% ethyl acetate/hexane. The appropriate fractions were combined, and the solvent removed by rotary evaporation to give an oil, 2.647 g, which contained 19% 4-mercapto-l-butanol by weight (product weight 2.07 g, 6.5 mmol, 30% yield): 1H NMR (300 MHz, CDCl3) δ 7.73 (d, J=2.7 Hz, 1H), 7.71 (d, J=2.3 Hz, 1H), 7.69 (d, J=1.0 Hz, 1H), 7.40 (dd, J=1.8, 8.5 Hz, 1H), 7.15 (dd, J=2.5, 8.8 Hz, 1H), 7.12 (d, J=2.3 Hz, 1H), 4.02 (q, J=7.1 Hz, 1H), 3.92 (s, 3H), 3.61-3.64 (m, 2H), 2.87 (m, 2H), 1.61 (d, J=7.1 Hz, 3H), 1.59 (m, 2H), 1.41 (m, 2H); mass spectrum (API-TIS) m/z 319 (M+H+), 336 (M+18+). partitioned between dichloromethane and water the water layer was washed with more dichloromethane The combined organic layer was washed with water and brine dried over magnesium sulfate The solution was concentrated under vacuum the residue was purified via column chromatography, 50% ethyl acetate/hexane the solvent removed by rotary evaporation to give an oil, 2.647 g, which

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2.80 g (12.2 mmoles) of 4(R)-t-butyldimethylsilyloxy-2,3-epoxycyclopentanone and 1.30 g (12.2 mmoles) of 4-mercaptobutan-1-ol were dissolved in 12 ml of methanol, and with stirring 1.87 ml (13.5 mmoles) of triethylamine was added. The stirring was continued for 30 minutes. Ten milliliters of a saturated aqueous solution of ammonium chloride was added, and the mixture was concentrated. The residue was extracted with ethyl acetate, dried over anhydrous magnesium sulfate, filtered and concentrated. The resulting oily product was chromatographed on a silica gel column using hexane/ethyl acetate (8/1) as an eluent to give 3.12 g (81%) of 4(RS)-t-butyldimethylsilyloxy-2-(4-hydroxybutylthio)-2-cyclopentenone. was added the mixture was concentrated The residue was extracted with ethyl acetate dried over anhydrous magnesium sulfate filtered concentrated The resulting oily product was chromatographed on a silica gel column