Potassium Carbonate → Methyl 7-(3-ethoxybenzyloxy)-1,1-dioxo-2,3-dihydro-1-benzothiepine-4-carboxylate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Methyl 7-hydroxy-1,1-dioxo-2,3-dihydro-1-benzothiepine-4-carboxylate (400 mg), the above-mentioned 3-ethoxybenzyl chloride (636 mg) and potassium carbonate (515 mg) were suspended in DMF (15 ml), and the resulting suspension was stirred at 60° C. for 14 hours. The reaction mixture was diluted with ethyl acetate and was washed respectively with water and an aqueous saturated solution of sodium chloride, and the organic layer was dried with anhydrous magnesium sulfate. The resulting organic layer was concentrated under reduced pressure to remove the solvent, and the residue was subjected to purification using silica gel column chromatography (hexane:ethyl acetate=3:1) to obtain methyl 7-(3-ethoxybenzyloxy)-1,1-dioxo-2,3-dihydro-1-benzothiepine-4-carboxylate (308 mg) as a yellow amorphous substance.

Herkunft & Nachweise