Tributyltin Chloride → 6-chloro-1-ethyl-3-tributylstannyl-1H-indazole

Participants

Reaction Conditions

Reaction Steps

To a solution of 6-chloro-1-ethyl-3-iodo-1H-indazole (150 mg, 0.47 mmol) in THF (3 mL) at 0° C. was slowly added isopropylmagnesium chloride (2.0 M in THF, 0.28 mL, 0.56 mmol). The bright yellow heterogeneous reaction mixture was stirred at 0° C. for 20 min then tributylchlorostannane (0.15 mL, 0.56 mmol) was added dropwise. Stirring was continued at 0° C. for 20 min then at room temperature for 2 h. The reaction mixture was quenched with water and extracted with EtOAc (2×). The combined organics were washed with brine then dried over MgSO4 and concentrated. The exact reaction was repeated once more on the same scale. The residues from the two runs were combined and purified by silica gel chromatography with 10% to 50% EtOAc/heptane (0.5% Et3N) to provide 128 mg (29%) of 6-chloro-1-ethyl-3-tributylstannanyl-1H-indazole as a colorless oil.

Provenance & Evidence