[C:1]([O:5][C:6]([NH:8][CH:9]([CH2:12][C:13]1[O:17][N:16]=[C:15]([O:18][S:19]([C:22]2[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=2)(=[O:21])=[O:20])[CH:14]=1)[CH2:10][OH:11])=[O:7])([CH3:4])([CH3:3])[CH3:2].[Cl:28][C:29]1[CH:30]=[CH:31][C:32]2[O:36][N:35]=[C:34](O)[C:33]=2[CH:38]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OCC)=O)=NC(OCC)=O>O1CCCC1>[C:1]([O:5][C:6]([NH:8][CH:9]([CH2:12][C:13]1[O:17][N:16]=[C:15]([O:18][S:19]([C:22]2[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=2)(=[O:20])=[O:21])[CH:14]=1)[CH2:10][O:11][C:34]1[C:33]2[CH:38]=[C:29]([Cl:28])[CH:30]=[CH:31][C:32]=2[O:36][N:35]=1)=[O:7])([CH3:4])([CH3:2])[CH3:3]To a solution of 0.5 g of 2-tert-butoxycarbonylamino-3-(3-benzenesulfonyloxyisoxazol-5-yl)-1-propanol in 5 ml of tetrahydrofuran are added 0.21 g of 5-chloro-3-hydroxy-1,2-benzoisoxazole, 0.43 g of triphenylphosphine and 0.28 g of diethyl azodicarboxylate with ice-cooling, and they are subjected to reaction at room temperature for 24 hours. Thereafter, the solvent is removed by distillation under reduced pressure. The residue obtained is purified by a column chromatography [eluant:n-hexane:ethyl acetate=4:1], to obtain 0.5 g of oily 3-[2-tert-butoxycarbonylamino-3-(3-benzenesulfonyloxy-5-isoxazolyl)propoxy]-5-chloro-1,2-benzoisoxazole.
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