A mixture containing 4-(4,4,5,5-Tetramethyl-[1,3,2]dioxaborolan-2-yl)-3,6-dihydro-2H-pyran (0.8 g, 3.8 mmol), 3-Bromo-5-nitro-1-trityl-1H-indazole (2 g, 4.0 mmol), PdCl2(dppf) (150 mg, 0.2 mmol) and potassium phosphate (2.6 g, 12 mmol) in dioxane (10 mL) was flushed with Ar and was heated at 80° C. for overnight under Ar. LC-MS indicated the completion of reaction and the mixture was filter through celite. The filtrate was concentrated and was purified on a column (10 hexane in dichloromethane) to give 1.2 g of product (64% yield).
