Cesium carbonate → Tert-butyl 2-(4-morpholinoanilino)-4-phenylbenzoate

Participants

Reaction Conditions

Reaction Steps

To toluene 3.0 mL solution of tert-butyl 2-amino-4-phenylbenzoate 94 mg were added 4-(4-bromophenyl)morpholine 0.21 g, cesium carbonate 0.23 g, tris(dibenzylideneacetone)dipalladium(0) 3.2 mg and 2-dicyclohexylphosphino-2′,4′,6′-triisopropylbiphenyl 8.3 mg at room temperature, and it was stirred at 110° C. for 6 hours. After the reaction mixture was cooled to room temperature, palladium acetate 1.6 mg, tris(dibenzylideneacetone)dipalladium(0) 3.2 mg and 2-dicyclohexylphosphino-2′,4′,6′-triisopropylbiphenyl 8.3 mg were added, and it was stirred at 110° C. for 12 hours. After the reaction mixture was cooled to room temperature, 4-(4-bromophenyl)morpholine 0.21 g, cesium carbonate 0.23 g, palladium acetate 1.6 mg, tris(dibenzylideneacetone)dipalladium(0) 3.2 mg and 2-dicyclohexylphosphino-2′,4′,6′-triisopropylbiphenyl 8.3 mg were added, and it was stirred at 110° C. for 4 hours. After the reaction mixture was cooled to room temperature, insoluble matter was filtrated, and ethyl acetate and 10% citric acid aqueous solution were added to it. The organic layer was separated and collected, dried over anhydrous magnesium sulfate after washing with saturated sodium chloride aqueous solution, and the solvent was removed under reduced pressure. The obtained residue was refined by silica gel column chromatography [Trikonex company, Flash Tube 2008, eluent; hexane:ethyl acetate=4:1] to give tert-butyl 2-(4-morpholinoanilino)-4-phenylbenzoate.

Provenance & Evidence