Tributyltin Chloride → 5-isopropyl-1-methyl-3-(tributylstannyl)-1H-indazole

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 3-iodo-5-isopropyl-1-methyl-1H-indazole (0.3 g, crude) in 100 mL of dry THF at −16° C. under nitrogen was added i-PrMgCl (0.69 mL, 1.38 mmol, 2M in THF) drop-wise. Then the mixture was stirred at −16° C. for 20 minutes. Tributylchlorostannane (0.39 g, 1.2 mmol) was added slowly and the mixture was stirred at room temperature for 2.5 hours. The solution was quenched by 40 mL of water, extracted with ethyl acetate (2×100 mL), washed with water (2×50 mL), brine (50 mL) and dried over anhydrous sodium sulfate. The drying agent was removed by filtration and the filtrate was evaporated under reduced pressure to give crude 5-isopropyl-1-methyl-3-(tributylstannyl)-1H-indazole as an oil, which was used into next step without further purification.

Provenance & Evidence