3,3-dimethylazetidin-2-one

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

Procedure: A flask is charged with 3,3-dimethyl-azetidin-2-one (0.159 g, 1.524 mmol), aqueous formaldehyde (37% wt., 0.124 g, 1.524 mmol) and crushed potassium carbonate (0.009 g, 0.061 mmol). The flask is lowered in a pre-heated oil bath (75° C.). After 15 min, the flask is removed from the oil bath and allowed to stand at room temperature. After 2 h, the mixture is taken up in acetone, dried over magnesium sulfate and filtered through a plug of silica gel. Concentration in vacuo (30° C., 40 Torr) gives 1-hydroxymethyl-3,3-dimethyl-azetidin-2-one, which is used in the next step without further purification. 1H NMR (400 MHz, CDCl3) δ ppm 1.32 (s, 6H), 3.23 (s, 2H), 4.69 (d, J=7.5 Hz, 2H). The flask is lowered in a pre-heated oil bath (75° C.) the flask is removed from the oil bath to stand at room temperature After 2 h dried over magnesium sulfate filtered through a plug of silica gel Concentration in vacuo (30° C., 40 Torr)

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

Procedure: A flask is charged with 3,3-dimethyl-azetidin-2-one (0.159 g, 1.524 mmol), aqueous formaldehyde (37% wt., 0.124 g, 1.524 mmol) and crushed potassium carbonate (0.009 g, 0.061 mmol). The flask is lowered in a pre-heated oil bath (75° C.). After 15 min, the flask is removed from the oil bath and allowed to stand at room temperature. After 2 h, the mixture is taken up in acetone, dried over magnesium sulfate and filtered through a plug of silica gel. Concentration in vacuo (30° C., 40 Torr) gives 1-hydroxymethyl-3,3-dimethyl-azetidin-2-one, which is used in the next step without further purification. 1H NMR (400 MHz, CDCl3) δ ppm 1.32 (s, 6H), 3.23 (s, 2H), 4.69 (d, J=7.5 Hz, 2H). The flask is lowered in a pre-heated oil bath (75° C.) the flask is removed from the oil bath to stand at room temperature After 2 h dried over magnesium sulfate filtered through a plug of silica gel Concentration in vacuo (30° C., 40 Torr)

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

Procedure: A flask is charged with 3,3-dimethyl-azetidin-2-one (0.159 g, 1.524 mmol), aqueous formaldehyde (37% wt., 0.124 g, 1.524 mmol) and crushed potassium carbonate (0.009 g, 0.061 mmol). The flask is lowered in a pre-heated oil bath (75° C.). After 15 min, the flask is removed from the oil bath and allowed to stand at room temperature. After 2 h, the mixture is taken up in acetone, dried over magnesium sulfate and filtered through a plug of silica gel. Concentration in vacuo (30° C., 40 Torr) gives 1-hydroxymethyl-3,3-dimethyl-azetidin-2-one, which is used in the next step without further purification. 1H NMR (400 MHz, CDCl3) δ ppm 1.32 (s, 6H), 3.23 (s, 2H), 4.69 (d, J=7.5 Hz, 2H). The flask is lowered in a pre-heated oil bath (75° C.) the flask is removed from the oil bath to stand at room temperature After 2 h dried over magnesium sulfate filtered through a plug of silica gel Concentration in vacuo (30° C., 40 Torr)

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

Procedure: A flask is charged with 3,3-dimethyl-azetidin-2-one (0.159 g, 1.524 mmol), aqueous formaldehyde (37% wt., 0.124 g, 1.524 mmol) and crushed potassium carbonate (0.009 g, 0.061 mmol). The flask is lowered in a pre-heated oil bath (75° C.). After 15 min, the flask is removed from the oil bath and allowed to stand at room temperature. After 2 h, the mixture is taken up in acetone, dried over magnesium sulfate and filtered through a plug of silica gel. Concentration in vacuo (30° C., 40 Torr) gives 1-hydroxymethyl-3,3-dimethyl-azetidin-2-one, which is used in the next step without further purification. 1H NMR (400 MHz, CDCl3) δ ppm 1.32 (s, 6H), 3.23 (s, 2H), 4.69 (d, J=7.5 Hz, 2H). The flask is lowered in a pre-heated oil bath (75° C.) the flask is removed from the oil bath to stand at room temperature After 2 h dried over magnesium sulfate filtered through a plug of silica gel Concentration in vacuo (30° C., 40 Torr)

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

Procedure: A flask is charged with 3,3-dimethyl-azetidin-2-one (0.159 g, 1.524 mmol), aqueous formaldehyde (37% wt., 0.124 g, 1.524 mmol) and crushed potassium carbonate (0.009 g, 0.061 mmol). The flask is lowered in a pre-heated oil bath (75° C.). After 15 min, the flask is removed from the oil bath and allowed to stand at room temperature. After 2 h, the mixture is taken up in acetone, dried over magnesium sulfate and filtered through a plug of silica gel. Concentration in vacuo (30° C., 40 Torr) gives 1-hydroxymethyl-3,3-dimethyl-azetidin-2-one, which is used in the next step without further purification. 1H NMR (400 MHz, CDCl3) δ ppm 1.32 (s, 6H), 3.23 (s, 2H), 4.69 (d, J=7.5 Hz, 2H). The flask is lowered in a pre-heated oil bath (75° C.) the flask is removed from the oil bath to stand at room temperature After 2 h dried over magnesium sulfate filtered through a plug of silica gel Concentration in vacuo (30° C., 40 Torr)