[OH:1][CH2:2][CH:3]([CH2:18][OH:19])[CH:4]1[C:13]2[C:8](=[CH:9][C:10]([O:16][CH3:17])=[C:11]([O:14][CH3:15])[CH:12]=2)[CH2:7][CH2:6][NH:5]1.C=O.Cl.[C:23](O)(=O)C>C1C=CC=CC=1.CO>[OH:1][CH2:2][CH:3]1[CH:4]2[C:13]3[C:8]([CH2:7][CH2:6][N:5]2[CH2:23][O:19][CH2:18]1)=[CH:9][C:10]([O:16][CH3:17])=[C:11]([O:14][CH3:15])[CH:12]=3A suspension of 6 mmoles (1.6 g) of 1-[bis(hydroxymethyl)-methyl]-6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline in 50 ml of absolute benzene is admixed with a suspension of 7 mmoles (0.02 g) of paraformaldehyde in 10 ml of absolute methanol. The reaction mixture is refluxed for two hours in the presence of a catalytic amount of hydrochloric acid or acetic acid, whereupon the obtained pale-yellow solution is evaporated in vacuo. The residual oily product is triturated with a small amount of acetone to yield the aimed compound in crystalline form in a yield of 89%.
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