[Cl:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[C:8](SC)=[N:7][CH2:6][CH:5]2[C:14]1[CH:19]=[CH:18][C:17]([N+:20]([O-:22])=[O:21])=[CH:16][CH:15]=1.[CH3:23][NH:24][CH3:25]>C1COCC1>[Cl:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[C:8]([N:24]([CH3:25])[CH3:23])=[N:7][CH2:6][CH:5]2[C:14]1[CH:19]=[CH:18][C:17]([N+:20]([O-:22])=[O:21])=[CH:16][CH:15]=1400 mg of 6-chloro-1-methylthio-4-(4-nitrophenyl)-3,4-dihydroisoquinoline (compound 1) were heated with 20 ml of dimethylamine in THF at 120° C. in a shaking autoclave under inert gas for 20 hours. Removal of the solvent by distillation was followed by MPLC chromatography on an MPRC cartridge with a mixture of 10 parts by volume of ethyl acetate, 5 parts by volume of n-heptane, 5 parts by volume of dichloromethane, 5 parts by volume of methanol and 1 part by volume of concentrated aqueous ammonia solution. Semisolid, partly amorphous product.
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