Potassium Iodide → alpha-(3,4-Dimethoxyphenyl)-3,4-dihydro-6,7-dimethoxy-alpha-[(4-methylphenyl)thio]-2(1H)-isoquinolinepentanenitrile

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To a solution of 3.20 g of α-(3-chloropropyl)-3,4-dimethoxy-α-[(4-methylphenyl)thio]benzeneacetonitrile in 30 mL of dimethyl formamide, under argon, is added 2.78 g of potassium carbonate, 79.5 mg of potassium iodide, and 1.84 g of 6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline hydrochloride. The reaction mixture is then heated at 95° C. for 4 hours, then allowed to cool and stir at ambient temperature for 12 hours. The solvent is evaporated from the mixture under vacuum at 45° C. The residue is partitioned between diethyl ether and water. The organic solution is dried with magnesium sulfate, filtered and evaporated to give the crude product. The product is chromatographed on a column of silica gel and is eluted with ethyl acetate providing 1.6 g of the desired product, after evaporation of the solvent, as an orange gum.

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