tert-butyl (3S)-2,2-dimethylthiomorpholine-3-carboxylate

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

Procedure: To a suspension of 20.0 g (0.104 mol) of 4-hydroxybenzenesulfonyl chloride in 200 mL of chloroform was added 28.25 mL (0.114 mol) of bis(trimethylsilyl)acetamide and the reaction was stirred at room temperature for 1 h, after which all of the solids have dissolved. To this mixture was added 20.0 g (0.087 mol) of tert-butyl (3S)-2,2-dimethyl-3-thiomorpholine carboxylate followed by 19.2 mL of 4-methylmorpholine and the reaction was stirred overnight at room temperature. After the addition of 400 mL of methanol to the reaction, the resulting mixture was stirred overnight at room temperature and then concentrated in vacuo. The residue was diluted with ethyl acetate and the organics were washed with water and 5% HCl solution, dried over magnesium sulfate, filtered and concentrated in vacuo. The resulting white solid was washed with ether/hexanes (1:2) and dried in vacuo to give 28.4 g (85%) of tert-butyl (3S)-4-[(4-hydroxyphenyl)sulfonyl]-2,2-dimethyl-3-thiomorpholine carboxylate as a white solid. Electrospray Mass Spec 386.5 (M−H)−. after which all of the solids have dissolved the reaction was stirred overnight at room temperature to the reaction the resulting mixture was stirred overnight at room temperature concentrated in vacuo The residue was diluted with ethyl acetate the organics were washed with water and 5% HCl solution dried over magnesium sulfate filtered concentrated in vacuo The resulting white solid was washed with ether/hexanes (1:2) dried in vacuo

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

Procedure: To a suspension of 20.0 g (0.104 mol) of 4-hydroxybenzenesulfonyl chloride in 200 mL of chloroform was added 28.25 mL (0.114 mol) of bis(trimethylsilyl)acetamide and the reaction was stirred at room temperature for 1 h, after which all of the solids have dissolved. To this mixture was added 20.0 g (0.087 mol) of tert-butyl (3S)-2,2-dimethyl-3-thiomorpholine carboxylate followed by 19.2 mL of 4-methylmorpholine and the reaction was stirred overnight at room temperature. After the addition of 400 mL of methanol to the reaction, the resulting mixture was stirred overnight at room temperature and then concentrated in vacuo. The residue was diluted with ethyl acetate and the organics were washed with water and 5% HCl solution, dried over magnesium sulfate, filtered and concentrated in vacuo. The resulting white solid was washed with ether/hexanes (1:2) and dried in vacuo to give 28.4 g (85%) of tert-butyl (3S)-4-[(4-hydroxyphenyl)sulfonyl]-2,2-dimethyl-3-thiomorpholine carboxylate as a white solid. Electrospray Mass Spec 386.5 (M−H)−. after which all of the solids have dissolved the reaction was stirred overnight at room temperature to the reaction the resulting mixture was stirred overnight at room temperature concentrated in vacuo The residue was diluted with ethyl acetate the organics were washed with water and 5% HCl solution dried over magnesium sulfate filtered concentrated in vacuo The resulting white solid was washed with ether/hexanes (1:2) dried in vacuo

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

Procedure: To a suspension of 20.0 g (0.104 mol) of 4-hydroxybenzenesulfonyl chloride in 200 mL of chloroform was added 28.25 mL (0.114 mol) of bis(trimethylsilyl)acetamide and the reaction was stirred at room temperature for 1 h, after which all of the solids have dissolved. To this mixture was added 20.0 g (0.087 mol) of tert-butyl (3S)-2,2-dimethyl-3-thiomorpholine carboxylate followed by 19.2 mL of 4-methylmorpholine and the reaction was stirred overnight at room temperature. After the addition of 400 mL of methanol to the reaction, the resulting mixture was stirred overnight at room temperature and then concentrated in vacuo. The residue was diluted with ethyl acetate and the organics were washed with water and 5% HCl solution, dried over magnesium sulfate, filtered and concentrated in vacuo. The resulting white solid was washed with ether/hexanes (1:2) and dried in vacuo to give 28.4 g (85%) of tert-butyl (3S)-4-[(4-hydroxyphenyl)sulfonyl]-2,2-dimethyl-3-thiomorpholine carboxylate as a white solid. Electrospray Mass Spec 386.5 (M−H)−. after which all of the solids have dissolved the reaction was stirred overnight at room temperature to the reaction the resulting mixture was stirred overnight at room temperature concentrated in vacuo The residue was diluted with ethyl acetate the organics were washed with water and 5% HCl solution dried over magnesium sulfate filtered concentrated in vacuo The resulting white solid was washed with ether/hexanes (1:2) dried in vacuo

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

Procedure: To a suspension of 20.0 g (0.104 mol) of 4-hydroxybenzenesulfonyl chloride in 200 mL of chloroform was added 28.25 mL (0.114 mol) of bis(trimethylsilyl)acetamide and the reaction was stirred at room temperature for 1 h, after which all of the solids have dissolved. To this mixture was added 20.0 g (0.087 mol) of tert-butyl(3S)-2,2-dimethyl-3-thiomorpholine carboxylate followed by 19.2 mL of 4-methylmorpholine and the reaction was stirred overnight at room temperature. After the addition of 400 mL of methanol to the reaction, the resulting mixture was stirred overnight at room temperature and then concentrated in vacuo. The residue was diluted with ethyl acetate and the organics were washed with water and 5% HCl solution, dried over magnesium sulfate, filtered and concentrated in vacuo. The resulting white solid was washed with ether/hexanes (1:2) and dried in vacuo to give 28.4 g (85%) of tert-butyl(3S)-4-[(4-hydroxyphenyl)sulfonyl]-2,2-dimethyl-3-thiomorpholine carboxylate as a white solid. Electrospray Mass Spec 386.5 (M−H)−. after which all of the solids have dissolved the reaction was stirred overnight at room temperature to the reaction the resulting mixture was stirred overnight at room temperature concentrated in vacuo The residue was diluted with ethyl acetate the organics were washed with water and 5% HCl solution dried over magnesium sulfate filtered concentrated in vacuo The resulting white solid was washed with ether/hexanes (1:2) dried in vacuo