[N:1]1[CH:6]=[CH:5][CH:4]=[CH:3][C:2]=1[NH:7][C:8]1[CH:26]=[CH:25][C:11]([O:12][C:13]2[C:18]([C:19]3[CH2:23][CH2:22][C:21](=[O:24])[CH:20]=3)=[CH:17][CH:16]=[CH:15][N:14]=2)=[CH:10][CH:9]=1.[BH4-].[Na+]>O1CCCC1.CO>[N:1]1[CH:6]=[CH:5][CH:4]=[CH:3][C:2]=1[NH:7][C:8]1[CH:9]=[CH:10][C:11]([O:12][C:13]2[C:18]([C:19]3[CH2:23][CH2:22][CH:21]([OH:24])[CH:20]=3)=[CH:17][CH:16]=[CH:15][N:14]=2)=[CH:25][CH:26]=1A suspension of 3-(2-(4-(pyridin-2-ylamino)phenoxy)pyridin-3-yl)cyclopent-2-enone (791 mg, 2.304 mmol, Example 1) in Tetrahydrofuran (150 mL) and Methanol (15.00 mL) was cooled to 0° C. under nitrogen, and was treated with sodium borohydride (349 mg, 9.21 mmol, 4.0 equiv) in 4 lots over 15 min. The reaction was warmed to 23° C. and was stirred under nitrogen. After 24 h, the reaction was quenched with saturated ammonium chloride solution (15 mL). The suspension was diluted with EtOAc (250 mL) and washed with saturated ammonium chloride solution (100 mL) and brine (100 mL), dried over MgSO4, concentrated in vacuo and purified by silica gel chromatography (eluant: 1-4% methanol/dichloromethane), affording 3-(2-(4-(pyridin-2-ylamino)phenoxy)pyridin-3-yl)cyclopent-2-enol.
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