Potassium Carbonate → Biphenyl

Participants

Reaction Conditions

Reaction Steps

4,4,5,5-Tetramethyl-2-[4-(2-methylisoindolin-1-one)-yl]-[1,3,2]-dioxoborolane (0.97 g, 3.6 mmol) and 4-chloro-3-nitroanisole (0.67 g, 3.6 mmol) were dissolved in a mixture of dioxane (10 mL) and water (2 mL). K2CO3 (0.98 g, 7.2 mmol) and Pd(PPh3)4 (0.21 g, 0.2 mmol) were added. The reaction mixture was heated in a flow of argon to 80° C., kept at this temperature over a period of 24 h (TLC monitoring: hexane/ethyl acetate, 4:1), cooled, and filtered through Celite. The filtrate was evaporated. The residue was dissolved in CH2Cl2. An undissolved precipitate was filtered off. The filtrate was partially evaporated, and the product was purified in a short silica gel column (hexane/ethyl acetate) to give 0.76 g of a product containing PPh3O. The product was cyclized without additional purification.

Provenance & Evidence