[CH2:1]([N:5]1[C:14](=[O:15])[C:13]([C:16]#[N:17])=[C:12]2[C:7]([CH2:8][CH2:9][CH2:10][CH2:11]2)=[CH:6]1)[CH2:2][CH2:3][CH3:4].C1(C)C=CC=CC=1.[H-].C([Al+]CC(C)C)C(C)C.Cl>C1(C)C=CC=CC=1>[CH2:1]([N:5]1[C:14](=[O:15])[CH:13]([C:16]#[N:17])[C:12]2[CH2:11][CH2:10][CH2:9][CH2:8][C:7]=2[CH2:6]1)[CH2:2][CH2:3][CH3:4]2-Butyl-3-oxol-2,3,5,6,7,8-hexahydroisoquinoline-4-carbonitrile (7-012) (100 mg, 0.43 mmol) was dissolved in toluene (10 mL), and to the reaction mixture was added 1 M diisobutylaluminium hydride toluene solution (0.8 mL, 0.8 mmol) under ice-cooling, and the reaction mixture was stirred for 10 min. To the reaction mixture was added 1 mol/L diluted hydrochloric acid (5 mL), and the reaction mixture was extracted with ethyl acetate (10 mL), washed with brine (5 mL), dried over anhydrous magnesium sulfate, and evaporated under reduced pressure. The obtained residue was purified by silica gel column chromatography (toluene/ethyl acetate) to give 2-butyl-3-oxo-1,2,3,4,5,6,7,8-octahydroisoquinoline-4-carbonitrile (7-018) (70 mg, 70%) as a white powder.
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