Potassium Carbonate → Methyl 7-(5-methyl-2-thienyl)-1,1-dioxo-2,3-dihydro-1-benzothiepine-4-carboxylate

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Reaction Steps

In toluene/ethanol/water (10/1/1.2 ml) was dissolved methyl 7-bromo-1,1-dioxo-2,3-dihydro-1-benzothiepine-4-carboxylate (870 mg), and to the solution were added 5-methyl-2-thienyl borate (530 mg) and potassium carbonate (1.02 g). The mixture was stirred at room temperature for 30 minutes, and to the mixture was added tetrakistriphenylphosphinepalladium (152 mg). The mixture was stirred at 100° C. for 16 hours, cooled to room temperature, extracted with ethyl acetate, washed with saturated brine and dried with magnesium sulfate. Under reduced pressure, the solvent was evaporated, and the residue was purified with silica gel column chromatography (hexane/ethyl acetate=3/1) to give methyl 7-(5-methyl-2-thienyl)-1,1-dioxo-2,3-dihydro-1-benzothiepine-4-carboxylate (210 mg).

Provenance & Evidence