反应详情

To a mixture of (S)-1-(benzyloxycarbonyl)-3-methylpyrrolidine-3-carboxylic acid (32.87 g, 124.8 mmol), Boc2O (29.97 g, 137.3 mmol) in ethyl acetate (200 mL) was added pyridine (12.62 mL, 156.1 mmol) and the reaction mixture was stirred at ambient temperature for 3 hours. A solution of 28-30% w/w NH4OH/water (21.79 mL, 162.3 mmol) was added. The reaction was stirred at ambient temperature for 5 hours. Water (50 mL) was added. The organic layer was separated, washed with 1N HCl (50 mL) and brine, dried and concentrated under reduced pressure to give (S)-benzyl 3-carbamoyl-3-methylpyrrolidine-1-carboxylate (31.30 g, 119.3 mmol, 95.6% yield) as an oil.

1. stirringThe reaction was stirred at ambient temperature for 5 hours
2. customThe organic layer was separated
3. washwashed with 1N HCl (50 mL) and brine
4. customdried
5. concentrationconcentrated under reduced pressure