tert-butyl N-[(2S,3S)-1-hydroxy-2-methyl-4-oxoazetidin-3-yl]carbamate

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

实验步骤: A solution of 4.98 of (3S-trans)-3-t-butoxycarbonylamino-1-hydroxy-4-methylazetidinone in 200 ml of methanol is treated with 132 ml of 4.5M ammonium acetate and then 66 ml of 1.5M titanium trichloride and stirred for 4.5 hours. The aqueous solution is diluted with an equal volume of 8% sodium chloride and extracted with ethyl acetate to give 3.48 g of crude product. Recrystallization from ether-hexane yields 3.3 g of the title compound. extracted with ethyl acetate to give 3.48 g of crude product Recrystallization from ether-hexane

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

实验步骤: A solution of 9.18 g of (3S-trans)-N-benzyloxy-3-t-butoxycarbonylamino-4-methylazetidinone in 300 ml of 95% ethanol is stirred in an atmosphere of hydrogen with 1.85 g of 10% palladium on charcoal. After 141 minutes the slurry is filtered and evaporated in vacuo. The residue is recrystallized from ether-hexane to yield 5.12 g of the title compound. After 141 minutes the slurry is filtered evaporated in vacuo The residue is recrystallized from ether-hexane

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

实验步骤: A solution of 4.98 g of (3S-trans)-3-t-butoxycarbonylamino-1-hydroxy-4-methylazetidinone in 200 ml of methanol was treated with 132 ml of 4.5 M ammonium acetate and then 66 ml of 1.5 titanium trichloride and stirred for 4.5 hours. The aqueous solution was diluted with an equal volume of 8% sodium chloride and extracted with ethyl acetate to give 3.48 g of crude product. Recrystallization from ether-hexane yielded 3.3 g of the title compound. extracted with ethyl acetate to give 3.48 g of crude product Recrystallization from ether-hexane

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

实验步骤: A solution of 4.98 g of (3S-trans)-3-t-butoxycarbonylamino-1-hydroxy-4-methylazetidinone in 200 ml of methanol was treated with 132 ml of 4.5 M ammonium acetate and then 66 ml of 1.5 titanium trichloride and stirred for 4.5 hours. The aqueous solution was diluted with an equal volume of 8% sodium chloride and extracted with ethyl acetate to give 3.48 g of crude product. Recrystallization from ether-hexane yielded 3.3 g of the title compound. extracted with ethyl acetate to give 3.48 g of crude product Recrystallization from ether-hexane

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

实验步骤: A solution of 9.18 g of (3S-trans)-N-benzyloxy-3-t-butoxycarbonylamino-4-methylazetidinone in 300 ml of 95% ethanol was stirred in an atmosphere of hydrogen with 1.85 g of 1% palladium on charcoal. After 141 minutes the slurry was filtered and evaporated in vacuo. The residue was recrystallized from ether-hexane to yield 5.12 g of the title compound. After 141 minutes the slurry was filtered evaporated in vacuo The residue was recrystallized from ether-hexane

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

实验步骤: A solution of 9.18 g of (3S-trans)-N-benzyloxy-3-t-butoxycarbonylamino-4-methylazetidinone in 300 ml of 95% ethanol was stirred in an atmosphere of hydrogen with 1.85 g of 1% palladium on charcoal. After 141 minutes the slurry was filtered and evaporated in vacuo. The residue was recrystallized from ether-hexane to yield 5.12 g of the title compound. After 141 minutes the slurry was filtered evaporated in vacuo The residue was recrystallized from ether-hexane

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

实验步骤: A solution of 4.98 of (3S-trans)-3-t-butoxycarbonylamino-1-hydroxy-4-methylazetidinone in 200 ml of methanol is treated with 132 ml of 4.5M ammonium acetate and then 66 ml of 1.5M titanium trichloride and stirred for 4.5 hours. The aqueous solution is diluted with an equal volume of 8% sodium chloride and extracted with ethyl acetate to give 3.48 g of crude product. Recrystallization from ether-hexane yields 3.3 g of the title compound. extracted with ethyl acetate to give 3.48 g of crude product Recrystallization from ether-hexane

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

实验步骤: A solution of 9.18 g of (3S-trans)-N-benzyloxy-3-t-butoxycarbonylamino-4-methylazetidinone in 300 ml of 95% ethanol is stirred in an atmosphere of hydrogen with 1.85 g of 10% palladium on charcoal. After 141 minutes the slurry is filtered and evaporated in vacuo. The residue is recrystallized from ether-hexane to yield 5.12 g of the title compound. After 141 minutes the slurry is filtered evaporated in vacuo The residue is recrystallized from ether-hexane

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

实验步骤: A solution of 9.18 g of (3S-trans)-N-benzyloxy-3-t-butoxycarbonylamino-4-methylazetidinone in 300 ml of 95% ethanol is stirred in an atmosphere of hydrogen with 1.85 g of 10% palladium on charcoal. After 141 minutes the slurry is filtered and evaporated in vacuo. The residue is recrystallized from ether-hexane to yield 5.12 g of the title compound. After 141 minutes the slurry is filtered evaporated in vacuo The residue is recrystallized from ether-hexane

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

实验步骤: To a solution of (3S-trans)-[[(1,1-dimethylethoxy)carbonyl]amino]-4-methyl-1-hydroxy-2azetidinone (55 mg, 0.26 mmol) and (S)-2-bromo-3-(phenylmethoxy)propanoic acid, diphenylmethyl ester (110 mg, 0.26 mmol) in dimethylformamide (1 ml) was added potassium carbonate (100 mg, 1 mmol). The resulting slurry was stirred for three hours at room temperature, quenched with hydrochloric acid (1N, 10 ml) and extracted with ether (20 ml). The organic layer was washed twice with dilute hydrochloric acid (1N, 2×10 ml), with saturated sodium chloride solution (20 ml), dried over magnesium sulfate and evaporated at reduced pressure. Purification of the product by preparative thin layer chromatography afforded the title compound (108 mg) as a mixture of diastereomers. quenched with hydrochloric acid (1N, 10 ml) extracted with ether (20 ml) The organic layer was washed twice with dilute hydrochloric acid (1N, 2×10 ml), with saturated sodium chloride solution (20 ml) dried over magnesium sulfate evaporated at reduced pressure Purification of the product by preparative thin layer chromatography

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

实验步骤: To a solution of (3S-trans)-[[(1,1-dimethylethoxy)carbonyl]amino]-4-methyl-1-hydroxy-2azetidinone (55 mg, 0.26 mmol) and (S)-2-bromo-3-(phenylmethoxy)propanoic acid, diphenylmethyl ester (110 mg, 0.26 mmol) in dimethylformamide (1 ml) was added potassium carbonate (100 mg, 1 mmol). The resulting slurry was stirred for three hours at room temperature, quenched with hydrochloric acid (1N, 10 ml) and extracted with ether (20 ml). The organic layer was washed twice with dilute hydrochloric acid (1N, 2×10 ml), with saturated sodium chloride solution (20 ml), dried over magnesium sulfate and evaporated at reduced pressure. Purification of the product by preparative thin layer chromatography afforded the title compound (108 mg) as a mixture of diastereomers. quenched with hydrochloric acid (1N, 10 ml) extracted with ether (20 ml) The organic layer was washed twice with dilute hydrochloric acid (1N, 2×10 ml), with saturated sodium chloride solution (20 ml) dried over magnesium sulfate evaporated at reduced pressure Purification of the product by preparative thin layer chromatography

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

实验步骤: A solution of 4.98 of (3S-trans)-3-t-butoxycarbonylamino-1-hydroxy-4-methylazetidinone in 200 ml of methanol is treated with 132 ml of 4.5M ammonium acetate and then 66 ml of 1.5M titanium trichloride and stirred for 4.5 hours. The aqueous solution is diluted with an equal volume of 8% sodium chloride and extracted with ethyl acetate to give 3.48 g of crude product. Recrystallization from ether-hexane yields 3.3 g of the title compound. extracted with ethyl acetate to give 3.48 g of crude product Recrystallization from ether-hexane