2-(1-methoxy-1-methyl-ethyl)-4-tributylstannanyl-pyridine 13AO (0.1 g, 0.24 mmol), 3-bromo-5-nitro-1-trityl-1H-indazole 1AJ (0.12 g, 0.24 mmol), CsF (0.08 g, 0.53 mmol), [Pd2(dba)3] (5 mg, 0.005 mmol), Pd[P(t-Bu)3)2, and CuI (4 mg, 0.024 mmol) in DMF (2 ml) was degassed for 5 minutes. Then it was heated at 120° C. for two hours. Cooled to room temperature and diluted with EtOAc (10 ml). It was then filtered on a celite pad. Filtrate was washed with water (3 ml) and the organic extracts were dried over MgSO4. It was filtered again on a celite pad and concentrated. The residue was purified on silica gel eluting with 1/3 EtOAc/Hexane to give the desired product 3-[2-(1-methoxy-1-methyl-ethyl)-pyridin-4-yl]-5-nitro-1-trityl-1H-indazole 14AO (0.05 g, 39%).
