Cesium carbonate → 1-(5-Tert-butyl-2-methoxy-3-nitro-phenyl)-azetidin-2-one

Participants

Reaction Conditions

Reaction Steps

An oven-dried Schlenk tube was charged with the above nitroanisole (500 mg, 1.74 mmol), 2-azetidinone (150 mg, 2.1 mmol), tris(dibenzylideneacetone) dipalladium(0) (32 mg, 0.035 mmol), 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (58 mg, 0.1 mmol) and cesium carbonate (795 mg, 2.44 mmol). The tube was capped with a rubber septum, purged with argon and 1,4-dioxane (7 mL) was then added through the septum via a syringe. The tube was sealed with a teflon screwcap and the reaction mixture was stirred at 100° C. for 20 h. The reaction mixture was cooled to room temperature, diluted with EtOAc (100 mL), washed with water, brine and dried over anhydrous Na2SO4. The solvent was removed in vacuo, and the crude product was purified by column:chromatography (2:1 hexane-EtOAc) to give 1-(5-tert-butyl-2-methoxy-3-nitro-phenyl)-azetidin-2-one (516 mg, quantitative).

Provenance & Evidence