Hydrochloric Acid → Ethyl 3-methoxy-4-((1-methylpiperidin-4-yl)methoxy)benzoate

Participants

Reaction Conditions

Reaction Steps

Formaldehyde (35 ml of a 37% solution in water, 420 mmol) was added to a solution of ethyl 3-methoxy-4-(1-tert-butyloxycarbonylpiperidin-4-ylmethoxy)benzoate (35 g, 89 mmol) in formic acid (35 ml) and the reaction was heated at 95° C. for 3 hours. The reaction was cooled, the volatiles we re removed in vacuo and the residue was dissolved in dichloromethane. 3.0N Hydrogen chloride in diethyl ether (40 ml, 120 mmol) was added, together with a little diethyl ether and a solid was precipitated. Collection of the solid by suction filtration followed by drying in vacuo yielded ethyl 3-methoxy-4-(1-methylpiperidin-4-ylmethoxy)benzoate (30.6 g, 100% yield) as a white solid:

Provenance & Evidence