[CH2:1]([N:8]1[CH:12]=[C:11]([CH:13]([OH:15])[CH3:14])[C:10]([O:16][CH2:17][C:18]2[CH:23]=[CH:22][C:21]([O:24][CH2:25][C:26]3[N:27]=[C:28]([C:32]4[O:33][CH:34]=[CH:35][CH:36]=4)[O:29][C:30]=3[CH3:31])=[C:20]([O:37][CH3:38])[CH:19]=2)=[N:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1>[O-2].[O-2].[Mn+4].O1CCCC1>[CH2:1]([N:8]1[CH:12]=[C:11]([C:13](=[O:15])[CH3:14])[C:10]([O:16][CH2:17][C:18]2[CH:23]=[CH:22][C:21]([O:24][CH2:25][C:26]3[N:27]=[C:28]([C:32]4[O:33][CH:34]=[CH:35][CH:36]=4)[O:29][C:30]=3[CH3:31])=[C:20]([O:37][CH3:38])[CH:19]=2)=[N:9]1)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1A mixture of 1-{1-benzyl-3-[(4-{[2-(2-furyl)-5-methyl-1,3-oxazol-4-yl]methoxy}-3-methoxybenzyl)oxy]-1H-pyrazol-4-yl}-1-ethanol (0.15 g), activated manganese dioxide (0.50 g) and tetrahydrofuran (50 mL) was stirred at room temperature for 4 days. Manganese dioxide was removed by filtration, and the filtrate was concentrated. The obtained crystals were collected by filtration to give 1-{1-benzyl-3-[(4-{[2-(2-furyl)-5-methyl-1,3-oxazol-4-yl]methoxy}-3-methoxybenzyl)oxy]-1H-pyrazol-4-yl}-1-ethanone (0.13 g, yield 87%). Recrystallization from ethyl acetate-hexane gave colorless prism crystals. melting point: 144-145° C.
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