[CH:1]([C:3]1[CH:4]=[C:5]2[C:10](=[CH:11][CH:12]=1)[CH:9]([C:13]([O:15][CH2:16][CH3:17])=[O:14])[N:8]([C:18]([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19])[CH2:7][CH2:6]2)=[O:2].[BH4-].[Na+].[Cl-].[NH4+]>CO>[OH:2][CH2:1][C:3]1[CH:4]=[C:5]2[C:10](=[CH:11][CH:12]=1)[CH:9]([C:13]([O:15][CH2:16][CH3:17])=[O:14])[N:8]([C:18]([O:20][C:21]([CH3:22])([CH3:24])[CH3:23])=[O:19])[CH2:7][CH2:6]2To a solution of 1-ethyl 2-tert-butyl 6-formyl-3,4-dihydroisoquinoline-1,2(1H)-dicarboxylate (430 mg, 1.29 mmol) in MeOH (10 mL) was added sodium borohydride (24.40 mg, 0.64 mmol) at 0° C., and the mixture was stirred for 20 min. To the reaction mixture was added aqueous ammonium chloride solution, and the mixture was extracted with ethyl acetate. The organic layer was washed with brine, and dried over magnesium sulfate, and the solvent was evaporated under reduced pressure to give 1-ethyl 2-tert-butyl 6-(hydroxymethyl)-3,4-dihydroisoquinoline-1,2(1H)-dicarboxylate (390 mg, 1.163 mmol, 90%) as a colorless oil.
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