Br[C:2]1[CH:3]=[CH:4][C:5]([O:8][C:9]2[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=2)=[N:6][CH:7]=1.C([Li])CCC.CN(C)[CH:22]=[O:23].[BH4-].[Na+]>O.CO.C(OCC)C>[O:8]([C:5]1[N:6]=[CH:7][C:2]([CH2:22][OH:23])=[CH:3][CH:4]=1)[C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1
To a diethyl ether (30.0 mL) solution of 5-bromo-2-phenoxy-pyridine (1.02 g, 4.08 mmol) described in Manufacturing Example 40-1-1 was added dropwise n-butyl lithium (2.55 M n-hexane solution, 1.92 mL, 4.90 mmol) on a dry ice-ethanol bath (−78° C.) under nitrogen atmosphere, which was stirred for 30 minutes at −78° C. Thereafter, N,N-dimethylformamide (378 μL, 4.90 mmol) was added dropwise, which was stirred for 10 minutes at −78° C. Then, sodium borohydride (309 mg, 8.16 mmol) and methanol (15.0 mL) were added, which was stirred for 20 minutes at room temperature. Water was added to the reaction mixture, which was extracted with ethyl acetate. The organic layer was washed with saturated aqueous sodium chloride, and the solvent was evaporated under a reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate:heptane=1:1) to obtain the title compound (2.93 g, 66.5%).
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