Benzenesulfonyl chloride → 6-Bromo-3-fluoro-4-nitro-1-(phenylsulfonyl)-1H-indazole

Participants

Reaction Steps

To a stirring suspension of sodium hydride (60% in mineral oil) (0.677 g) in THF (25 ml) at 0° C. was added a solution of 6-bromo-3-fluoro-4-nitro-1H-indazole (4 g) in THF (25 ml) dropwise. The reaction mixture was allowed to stir for 30 min then allowed to warm to RT before benzenesulfonyl chloride (2.17 ml) was added. After approximately two hours the reaction mixture was partitioned between ethyl acetate and water. The layers were separated and the aq was then extracted again with ethyl acetate. The combined organics were then washed with brine, dried over magnesium sulphate, filtered and concentrated. The solid was triturated with methanol (50 ml) and filtered to yield the title compound, 5.96 g as a yellow solid.

Provenance & Evidence