2-巯基乙酸叔丁酯

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of 3-bromo-dihydro-furan-2-one (16 g, 97.6 mmol) in 300 mL of CH3CN was added K2CO3 (20 g, 146 mmol), followed by mercapto-acetic acid tert-butyl ester (14.5 g, 98 mmol). The reaction mixture was refluxed for 2 hrs and cooled. The mixture was filtered and the filtrate was concentrated. The residue was redissolved in 300 mL of EtOAc and the resulting solution was washed with 1N HCl (100 mL*2). The organic layer was dried over MaSO4, filtered andconcentrated to afford the ter-butyl ester title compound (23 g). 16 g of the ester was dissolved in 250 ml of HCl-MeOH (4M) and stirred at 25° C. for 4 hrs. The reaction mixture was concentrated below 45° C. in vacuum. The residue was purified by column chromatography (EtOAc) to afford 7 g of the title compound. The reaction mixture was refluxed for 2 hrs cooled The mixture was filtered the filtrate was concentrated The residue was redissolved in 300 mL of EtOAc the resulting solution was washed with 1N HCl (100 mL*2) The organic layer was dried over MaSO4 filtered

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 2.3 g (53.2 mmol) of sodium hydride in the form of a suspension in mineral oil are placed at 0° in 30 ml of tetrahydrofuran. Then at 0° to 10°, 6.6 g (44.:3 mmol) of thioglycolic acid tert-butyl ester are added dropwise thereto. A viscous suspension is formed which is diluted with 50 ml of tetrahydrofuran. The mixture is then stirred for 20 minutes at 0° and then 12 g (44.3 mmol) of 2-bromo-4-phenyl-butyric acid methyl ester are added dropwise thereto. The mixture is stirred for 2 hours at room temperature, then taken up in 100 ml of ethyl acetate and extracted by shaking in succession with 50 ml of water and 50 ml of saturated sodium chloride solution. The aqueous phases are combined and extracted by shaking with 25 ml of ethyl acetate. The organic phases are combined, dried over sodium sulfate, filtered and concentrated by evaporation. Chromatography on silica g al with hexane/ethyl acetate (20:1) as eluant yields 5.7 g (38% of theory) of 2-tert-butyloxycabonylmethylthio-4-phenyl-butyric acid ethyl ester in the form of an oil. A viscous suspension is formed which The mixture is stirred for 2 hours at room temperature extracted by shaking in succession with 50 ml of water and 50 ml of saturated sodium chloride solution extracted by shaking with 25 ml of ethyl acetate dried over sodium sulfate filtered concentrated by evaporation

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of 3-bromo-dihydro-furan-2-one (16 g, 97.6 mmol) in 300 mL of CH3CN was added K2CO3 (20 g, 146 mmol), followed by mercapto-acetic acid tert-butyl ester (14.5 g, 98 mmol). The reaction mixture was refluxed for 2 hrs and cooled. The mixture was filtered and the filtrate was concentrated. The residue was redissolved in 300 mL of EtOAc and the resulting solution was washed with 1N HCl (100 mL*2). The organic layer was dried over MaSO4, filtered and concentrated to afford the ter-butyl ester title compound (23 g). 16 g of the ester was dissolved in 250 ml of HCl-MeOH (4M) and stirred at 25° C. for 4 hrs. The reaction mixture was concentrated below 45° C. in vacuum. The residue was purified by column chromatography (EtOAc) to afford 7 g of the title compound. The reaction mixture was refluxed for 2 hrs cooled The mixture was filtered the filtrate was concentrated The residue was redissolved in 300 mL of EtOAc the resulting solution was washed with 1N HCl (100 mL*2) The organic layer was dried over MaSO4 filtered concentrated