[CH3:1][C:2]1[CH:3]=[N:4][C:5]2[CH:6]([O:12]C(=O)C)[CH2:7][CH2:8][CH2:9][C:10]=2[CH:11]=1>[OH-].[Na+].CO>[CH3:1][C:2]1[CH:3]=[N:4][C:5]2[CH:6]([OH:12])[CH2:7][CH2:8][CH2:9][C:10]=2[CH:11]=14.11 Grams of 3-methyl-8-acetoxy-5,6,7,8-tetrahydroquinoline was dissolved in 15 ml of 30%-sodium hydroxide aqueous solution and 15 ml of methanol, the thus obtained mixture was stirred with heating at 65° C. for 3 hours. The solvent was removed by evaporation, and the residue thus obtained was purified by a silica gel column chromatography (eluent: n-hexane/ethyl acetate=5/1) to obtain 1.50 g of 3-methyl-8-hydroxy-5,6,7,8-tetrahydroquinoline.
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