(5S)-5-propan-2-ylimidazolidine-2,4-dione

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

Procedure: To a suspension of lithium aluminum hydride (290 mg) in diethyl ether (20 mL) was added (5S)-5-(propan-2-yl)imidazolidine-2,4-dione (540 mg) while cooling in ice, and the mixture was stirred at room temperature overnight. After cooling in ice, water (1 mL), 4M aqueous sodium hydroxide solution (1 mL), THF (15 mL) and ethanol (2 mL) were added thereto, and the resulting mixture was stirred at room temperature for 10 min. After filtration through Celite (registered trademark), the filtrate was concentrated under reduced pressure to afford (4S)-4-(propan-2-yl)imidazolidin-2-one (160 mg). while cooling in ice After cooling in ice the resulting mixture was stirred at room temperature for 10 min After filtration through Celite (registered trademark) the filtrate was concentrated under reduced pressure

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

Procedure: To a suspension of lithium aluminum hydride (290 mg) in diethyl ether (20 mL) was added (5S)-5-(propan-2-yl)imidazolidine-2,4-dione (540 mg) while cooling in ice, and the mixture was stirred at room temperature overnight. After cooling in ice, water (1 mL), 4M aqueous sodium hydroxide solution (1 mL), THF (15 mL) and ethanol (2 mL) were added thereto, and the resulting mixture was stirred at room temperature for 10 min. After filtration through Celite (registered trademark), the filtrate was concentrated under reduced pressure to afford (4S)-4-(propan-2-yl)imidazolidin-2-one (160 mg). while cooling in ice After cooling in ice the resulting mixture was stirred at room temperature for 10 min After filtration through Celite (registered trademark) the filtrate was concentrated under reduced pressure

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

Procedure: To a suspension of lithium aluminum hydride (290 mg) in diethyl ether (20 mL) was added (5S)-5-(propan-2-yl)imidazolidine-2,4-dione (540 mg) while cooling in ice, and the mixture was stirred at room temperature overnight. After cooling in ice, water (1 mL), 4M aqueous sodium hydroxide solution (1 mL), THF (15 mL) and ethanol (2 mL) were added thereto, and the resulting mixture was stirred at room temperature for 10 min. After filtration through Celite (registered trademark), the filtrate was concentrated under reduced pressure to afford (4S)-4-(propan-2-yl)imidazolidin-2-one (160 mg). while cooling in ice After cooling in ice the resulting mixture was stirred at room temperature for 10 min After filtration through Celite (registered trademark) the filtrate was concentrated under reduced pressure

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

Procedure: To a suspension of L-valinamide hydrochloride (1.0 g) and sodium hydrogen carbonate (3.03 g) in acetonitrile (100 mL) was added p-nitrophenyl chloroformate (1.32 g), and the mixture was stirred at room temperature for 3 hr. Water was added thereto, the resulting mixture was stirred at room temperature overnight, and then acetonitrile was distilled off under reduced pressure. After extraction with ethyl acetate, the organic layer was concentrated under reduced pressure. The residue was purified by column chromatography (silica gel cartridge, chloroform/methanol) to afford (5S)-5-(propan-2-yl)imidazolidine-2,4-dione (540 mg). the resulting mixture was stirred at room temperature overnight acetonitrile was distilled off under reduced pressure After extraction with ethyl acetate the organic layer was concentrated under reduced pressure The residue was purified by column chromatography (silica gel cartridge, chloroform/methanol)