Cesium carbonate → Dicyclohexyl(2',6'-dimethoxy[1,1'-biphenyl]-2-YL)phosphine oxide

Participants

Reaction Conditions

Reaction Steps

To the mixture of 4-chlorobiphenyl (15 mg, 0.079 mmol) and 1,4-dioxane (1 ml), water (0.1 ml), cesium carbonate (0.16 g, 0.48 mmol), sodium 1,3-dioxo-1,3-dihydro-isoindole-2-ylmethyl trifluoroborate (40 mg, 0.16 mmol), palladium(II) acetate (1.8 mg, 0.0079 mmol), and 2-dicyclohexylphosphino-2′,6′-dimethoxybiphenyl (6.5 mg, 0.016 mmol) were added at room temperature, and then the obtained reaction mixture was stirred at 100° C. (an outer temperature) overnight. The reaction mixture was cooled to room temperature, and then hydrazine hydrate (40 mg, 0.79 mmol) and methanol (2 ml) were added thereto, followed by heating to reflux for 30 min. The reaction mixture was cooled to room temperature, and then water and ethyl acetate were added thereto, followed by filtration with celite. The organic layer of the filtrate was separated and washed with saline. The solvents were evaporated under reduced pressure from the organic layer, and then the obtained residue was purified with NH-silica gel column chromatography (ethyl acetate), thereby obtaining the entitled compound (7.7 mg, 53%) as the mixture with 2′-(dicyclohexyl-phosphinoyl)-2,6-dimethoxy-biphenyl (3.8 mg).

Provenance & Evidence