反应详情

Under a nitrogen atmosphere, to a solution of the above (3S)-3-(benzyloxy)butanoic acid (225 g) in DMF (1.5 L), N,O-dimethylhydroxylamine hydrochloride (111 g, 1.1 mol) and triethylamine (0.32 mL, 2.3 mol) were added, and the mixture was stirred at room temperature for 40 minutes. Subsequently, 1-hydroxybenzotriazole (112 g, 0.83 mol) and 1-ethyl-3-(3′-dimethylaminopropyl)carbodiimide hydrochloride (160 g, 0.83 mol) were successively added, and the mixture was stirred at room temperature for 5 hours. After the reaction, the reaction mixture was poured to ice-water, and it was extracted with diethyl ether. After it was successively washed with 1N hydrochloric acid, water, a saturated aqueous sodium hydrogencarbonate solution and saturated brine, it was dried with sodium sulfate and the solvent was distilled off under reduced pressure to give (3S)-3-(benzyloxy)-N-methoxy-N-methylbutanamide (196 g) as a mixture. The present compound was used for the subsequent reaction without further purification.

1. stirringthe mixture was stirred at room temperature for 5 hours
2. customAfter the reaction
3. extractionwas extracted with diethyl ether
4. washAfter it was successively washed with 1N hydrochloric acid, water
5. dry with materiala saturated aqueous sodium hydrogencarbonate solution and saturated brine, it was dried with sodium sulfate
6. distillationthe solvent was distilled off under reduced pressure