Water → Phenylmethyl (3R)-3-[[(1,1-dimethylethoxy)carbonyl]amino]-1-pyrrolidinecarboxylate

Participants

Reaction Steps

To a solution of (3R)-3-(tert-butyloxycarbonylamino)pyrrolidine (10.0 g) and triethylamine (5.43 g) in methylene chloride (100 mL) was added dropwise a solution of benzyloxycarbonyl chloride (7.7 mL) in methylene chloride (20 mL) over a period of 15 minutes under nitrogen gas atmosphere and ice-cooling and the mixture was stirred at room temperature for 1 hour. To the reaction mixture was added water (70 mL) and the mixture was extracted with chloroform. The extract was washed successively with water (70 mL), 5% citric acid solution (70 mL) and a saturated brine (70 mL) and the organic layer was dried over anhydrous magnesium sulfate. After concentration in vacuo, the resultant product was triturated in diisopropylether to give (3R)-1-benzyloxycarbonyl-3-(tert-butoxycarbonylamino)pyrrolidine (11.8 g, yield: 70%) as crystals.

Provenance & Evidence