C(O)CCC.[ClH:6].[OH:7][C:8]1[CH:9]=[C:10]([CH:14]=[CH:15][C:16]=1[OH:17])[CH2:11][CH2:12][NH2:13].C(O[CH:21](OCC)[CH2:22][S:23][C:24]1[CH:29]=[CH:28][C:27]([CH3:30])=[CH:26][CH:25]=1)C>Cl.O>[ClH:6].[CH3:30][C:27]1[CH:28]=[CH:29][C:24]([S:23][CH2:22][CH:21]2[C:14]3[C:10](=[CH:9][C:8]([OH:7])=[C:16]([OH:17])[CH:15]=3)[CH2:11][CH2:12][NH:13]2)=[CH:25][CH:26]=1To a mixture of n-butanol (10 ml), water (2.5 ml) and concentrated hydrochloric acid (1 drop) were added 3,4-dihydroxyphenethylamine hydrochloride (0.63 g) and (4-methylthiophenoxy)acetaldehyde diethyl acetal (1.0 g), and the mixture was refluxed for 5 hours. After the reaction, the reaction mixture was concentrated to dryness under reduced pressure. The residue was crystallized by adding acetone, and the crystals were recrystallized from a mixture solvent of methanol and ether to give 1-(4-methylthiophenoxy)methyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline hydrochloride (1.2 g), mp 270° C. (dec.).
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