[CH2:1]([O:8][C@@H:9]([CH3:14])[CH2:10][C:11]([OH:13])=O)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.Cl.[CH3:16][NH:17][O:18][CH3:19].C(N(CC)CC)C.ON1C2C=CC=CC=2N=N1.Cl.C(N=C=NCCCN(C)C)C>CN(C=O)C>[CH2:1]([O:8][C@@H:9]([CH3:14])[CH2:10][C:11]([N:17]([O:18][CH3:19])[CH3:16])=[O:13])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1Under 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.
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