[C:1]([O:5][C:6]([N:8]1[CH2:11][CH:10]([C:12]([OH:14])=O)[CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].Cl.[CH3:16][NH:17][CH3:18].Cl.CN(C)CCCN=C=NCC.O.ON1C2C=CC=CC=2N=N1>C(OCC)(=O)C.CN(C)C=O.C(N(CC)CC)C>[CH3:16][N:17]([CH3:18])[C:12]([CH:10]1[CH2:11][N:8]([C:6]([O:5][C:1]([CH3:4])([CH3:3])[CH3:2])=[O:7])[CH2:9]1)=[O:14]
Under a nitrogen atmosphere, triethylamine (1.2 ml) was added to a mixture of 1-(t-butyloxycarbonyl)-azetidine-3-carboxylic acid (0.804 g), dimethylamine hydrochloride (0.489 g), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (0.997 g), 1-hydroxybenzotriazole hydrate (0.796 g), and dimethylformamide (8 ml), and the mixture was stirred at room temperature for 3 days. To the reaction mixture was added ethyl acetate (30 ml), and the mixture was successively washed once with water, once with hydrochloric acid, once with water, twice with saturated aqueous sodium hydrogen carbonate and twice with water. The organic layer was dried over anhydrous sodium sulfate, and filtered. The filtrate was concentrated under reduced pressure to give the title compound (0.364 g, 40%).
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