[Cl:1][C:2]1[CH:27]=[N:26][CH:25]=[CH:24][C:3]=1[C:4]([NH:6][C:7]1[CH:12]=[C:11]([C:13]([F:22])([C:18]([F:21])([F:20])[F:19])[C:14]([F:17])([F:16])[F:15])[CH:10]=[CH:9][C:8]=1O)=[O:5].O1CCCC1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OCC)=O)=NC(OCC)=O>C1(C)C=CC=CC=1>[Cl:1][C:2]1[CH:27]=[N:26][CH:25]=[CH:24][C:3]=1[C:4]1[O:5][C:8]2[CH:9]=[CH:10][C:11]([C:13]([F:22])([C:18]([F:20])([F:19])[F:21])[C:14]([F:17])([F:16])[F:15])=[CH:12][C:7]=2[N:6]=1To a mixture of 0.90 g of 3-chloro-N-[2-hydroxy-5-(heptafluoroisopropyl)phenyl]isonicotinamide, 10 ml of tetrahydrofuran and 0.68 g of triphenylphosphine, 1.13 g of 40% toluene solution of diethyl azodicarboxylate was added dropwise at room temperature. The reaction mixture was stirred for 1.2 hours. The reaction mixture was concentrated under reduced pressure. The residue was subjected to silica gel column chromatography to give 0.58 g of 2-(3-chloropyridin-4-yl)-5-(heptafluoroisopropyl)benzoxazole (hereinafter, referred to as “active compound 68”).
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