tert-butyl 4-amino-1,2-oxazolidine-2-carboxylate

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

Procedure: A solution of 4-(2-Nitro-benzenesulfonylamino)-isoxazolidine-2-carboxylic acid tert-butyl ester (694 mg, 1.86 mmol) and PhSH (0.142 ml, 1.1 equiv) in MeCN (10 ml) under argon at room temperature was treated with K2CO3 (386 mg, 1.5 equiv). The reaction mixture turned bright yellow. The reaction was left to stir overnight. As TLC indicated complete consumption of starting material, volatiles were removed in vacuo. Flash column chromatography eluting with dichloromethane:methanol (10/0 then 9/1) afforded 336 mg of the title amine (1.8 mmol, 96%). 1H-NMR (CDCl3, 400 MHz): 4.03-3.92 (m, 3H), 3.89-3.76 (m, 1H), 3.70 (dd, 1H), 3.37 (dd, 1H), 1.51 (s, 9H). The reaction was left consumption of starting material, volatiles were removed in vacuo Flash column chromatography eluting with dichloromethane

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

Procedure: A solution of 4-(2-Nitro-benzenesulfonylamino)-isoxazolidine-2-carboxylic acid tert-butyl ester (694 mg, 1.86 mmol) and PhSH (0.142 ml, 1.1 equiv) in MeCN (10 ml) under argon at room temperature was treated with K2CO3 (386 mg, 1.5 equiv). The reaction mixture turned bright yellow. The reaction was left to stir overnight. As TLC indicated complete consumption of starting material, volatiles were removed in vacuo. Flash column chromatography eluting with dichloromethane:methanol (10/0 then 9/1) afforded 336 mg of the title amine (1.8 mmol, 96%). 1H-NMR (CDCl3, 400 MHz): 4.03-3.92 (m, 3H), 3.89-3.76 (m, 1H), 3.70 (dd, 1H), 3.37 (dd, 1H), 1.51 (s, 9H). The reaction was left consumption of starting material, volatiles were removed in vacuo Flash column chromatography eluting with dichloromethane

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

Procedure: A solution of 4-(2-Nitro-benzenesulfonylamino)-isoxazolidine-2-carboxylic acid tert-butyl ester (694 mg, 1.86 mmol) and PhSH (0.142 ml, 1.1 equiv) in MeCN (10 ml) under argon at room temperature was treated with K2CO3 (386 mg, 1.5 equiv). The reaction mixture turned bright yellow. The reaction was left to stir overnight. As TLC indicated complete consumption of starting material, volatiles were removed in vacuo. Flash column chromatography eluting with dichloromethane:methanol (10/0 then 9/1) afforded 336 mg of the title amine (1.8 mmol, 96%). 1H-NMR (CDCl3, 400 MHz): 4.03-3.92 (m, 3H), 3.89-3.76 (m, 1H), 3.70 (dd, 1H), 3.37 (dd, 1H), 1.51 (s, 9H). The reaction was left consumption of starting material, volatiles were removed in vacuo Flash column chromatography eluting with dichloromethane