Ethylene Glycol → {3-[Benzothiazol-2-yl(1-methylpiperidin-4-yloxy)methyl]phenyl}benzyl-amine

Participants

Reaction Conditions

Reaction Steps

A screw-capped tube is charged with 2-[(3-iodophenyl)(1-methylpiperidin-4-yloxy)methyl]benzothiazole (example 41, 190 mg), copper(I) iodide (4 mg), ethylene glycol (45 μL), potassium carbonate (173 mg), benzylamine (54 μL), and propan-2-ol (1 mL). The tube is evacuated, filled with argon and sealed. After stirring at 80° C. for 15 h, the mixture is diluted with ethyl acetate and water and the aqueous phase is extracted with ethyl acetate. The pooled organic extracts are dried over magnesium sulfate and concentrated under reduced pressure. The residue is purified by chromatography (gradient dichloromethane/methanol/ammonia from 98/2/0.5 to 95/5/0.5). The base is converted into its dioxalate salt in acetone to give {3-[benzothiazol-2-yl(1-methylpiperidin-4-yloxy)methyl]phenyl}benzyl-amine, dioxalate melting at 75° C.

Provenance & Evidence