Formaldehyde → 6-(Ethoxymethyl-amino)-N-(5-phenoxy-thiophen-2-ylmethyl)-nicotinamide

Participants

Reaction Steps

To a solution of 6-amino-N-(5-phenoxy-thiophen-2-ylmethyl)-nicotinamide described in Example A-138 (600 mg, 1.8 mmol) in ethanol (40 mL) were added 5,5-dimethylimidazo phospho-2,4-dione (260 mg, 2.0 mmol) and 37% formaldehyde aqueous solution (3 mL), and the solution was stirred under reflux for 30 minutes. Water and ethyl acetate were added to the reaction solution, which was then partitioned, and the organic layer was washed with water twice. NH silica gel was added to the organic layer, the solvent was evaporated in vacuo for adsorption, purification was carried out by NH silica gel column chromatography (ethyl acetate), and the title compound (457 mg, 1.19 mmol, 66.1%) was obtained as a white solid.

Provenance & Evidence