Citric Acid → HCID 68959443, compound

Participants

Reaction Conditions

Reaction Steps

To toluene 3.0 mL solution of tert-butyl 2-amino-4-phenethylbenzoate 0.10 g were added 1-iodo-3,4-methylenedioxybenzene 0.14 g,cesium carbonate 0.22 g, tris(dibenzylideneacetone)dipalladium(0) 3 mg and 2-dicyclohexylphosphino-2′,4′,6′-triisopropylbiphenyl 8 mg,and it was stirred at 110° C. for 24 hours. After the reaction mixture was cooled to room temperature, tris(dibenzylideneacetone)dipalladium(0) 3 mg and 2-dicyclohexylphosphino-2′,4′,6′-triisopropylbiphenyl 8 mg were added to it, and it was stirred at 110° C. for 24 hours. After the reaction mixture was cooled to room temperature, 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-((benzo-1,3-dioxol-5-yl)amino)-4-phenethylbenzoate. Trifluoroacetic acid 10 mL was added to the obtained tert-butyl 2-((benzo-1,3-dioxol-5-yl)amino)-4-phenethylbenzoate, and it was stirred at room temperature for 2 hours. The solvent was removed under reduced pressure, and the obtained residue was refined by reversed-phase silica gel column chromatography [eluent; 80-100% acetonitrile/0.1% trifluoroacetic acid aqueous solution] to give 2-((benzo-1,3-dioxol-5-yl)amino)-4-phenethylbenzoic acid 12 mg of white solid.

Provenance & Evidence