Cesium carbonate → HCID 90308894, compound

Participants

Reaction Conditions

Reaction Steps

Tert-butyl carbamate (81 mg), palladium acetate (4 mg), 2-dicyclohexylphosphino-2′,4′,6′-triisopropyl biphenyl (17 mg), and cesium carbonate (340 mg) were added to a solution of ethyl 4-(trifluoromethylsulfonyloxy)benzo[b]thiophene-6-carboxylate obtained in the above-described Step 2 (120 mg) in dioxane (2 ml), and the reaction solution was stirred at 100° C. for 3 hours. The reaction solution was diluted with ethyl acetate, and washed successively with a saturated aqueous sodium bicarbonate solution and a saturated saline solution. After drying over anhydrous sodium sulfate, the solvent was evaporated under vacuum. The residue was purified by column chromatography on silica gel (developing solvent:hexane-ethyl acetate) to obtain ethyl 4-(tert-butoxycarbonylamino)benzo[b]thiophene-6-carboxylate.

Provenance & Evidence