[CH2:1]([O:8][C:9]1[C:10]([Cl:19])=[N:11][CH:12]=[C:13]([CH:18]=1)[C:14](OC)=[O:15])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[BH4-].[Na+].O>C(O)C>[CH2:1]([O:8][C:9]1[CH:18]=[C:13]([CH2:14][OH:15])[CH:12]=[N:11][C:10]=1[Cl:19])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1To a suspension of methyl 5-(benzyloxy)-6-chloronicotinate (3.00 g) in ethanol (40 mL) was added sodium tetrahydroborate (1.02 g), and the mixture was stirred at 60° C. for 3 hr. Water was added to the reaction mixture at 0° C., and the mixture was extracted with ethyl acetate. The extract was washed with water and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (1.76 g) as a colorless solid.
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