C([O:8][C:9]1[CH:30]=[CH:29][C:12]([CH2:13][C:14]2[CH:18]=[C:17]([C:19]3[C:20]([NH2:28])=[N:21][C:22]([CH2:25][O:26][CH3:27])=[CH:23][CH:24]=3)[O:16][N:15]=2)=[CH:11][CH:10]=1)C1C=CC=CC=1.ClCCl.B(Br)(Br)Br>CO>[NH2:28][C:20]1[C:19]([C:17]2[O:16][N:15]=[C:14]([CH2:13][C:12]3[CH:29]=[CH:30][C:9]([OH:8])=[CH:10][CH:11]=3)[CH:18]=2)=[CH:24][CH:23]=[C:22]([CH2:25][O:26][CH3:27])[N:21]=1To a mixture of 3-(3-(4-benzyloxy-benzyl)-isoxazol-5-yl)-6-methoxymethyl-pyridin-2-ylamine (30 mg, 0.075 mmol) described in Example 26 and dichloromethane (1 mL) was added boron tribromide (220 μL, 1 M dichloromethane solution, 0.22 mmol) at −78° C., which was stirred for 1 hour at 0° C. The reaction mixture was cooled to −78° C., methanol was added at the same temperature, and the excess boron tribromide was quenched. The reaction mixture was gradually allowed to room temperature, a sodium acetate aqueous solution was added to the reaction mixture at room temperature, which was neutralized, after which water was added, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated aqueous sodium chloride, and was concentrated under a reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate:heptane=2:1) to obtain the title compound (4.6 mg, 20%).
読み込み中…
