Ethyl Acetate → HCID 22319567, compound

Participants

Reaction Steps

1.54 g of 4-benzyloxyphenylboronic acid, 1.32 g of sodium carbonate in 20 cm3 of water and 404 mg of tetrakis(triphenylphosphine)palladium are added to 2 g of N-[5-bromo-6-chloro-1-[[2-(trimethylsilyl)ethoxy]methyl]-1H-indazol-3-yl]butanamide, described in Example 58, in 100 cm3 of dioxane. The mixture is refluxed for 18 hours, the temperature is then allowed to return to room temperature to add 75 cm3 of ethyl acetate and 50 cm3 of water, and the reaction medium is filtered through a sinter funnel packed with Celite. The filtrate is separated by settling and the organic phase is washed successively with 100 cm3 of water and then with 75 cm3 of saturated aqueous sodium chloride solution, separated out after settling of the phases has taken place, dried over magnesium sulphate, filtered and concentrated to dryness under reduced pressure (2 kPa; 50° C.). The residue is purified by chromatography under an argon pressure of 50 kPa, on a column of silica gel (particle size 40-60/μm; diameter 4.5 cm), eluting with a cyclohexane/ethyl acetate mixture (80/20 by volume). The fractions containing the expected product are combined and evaporated under reduced pressure (2 kPa; 50° C.); the residue is taken up in 50 cm3 of cyclohexane, filtered off, washed with 2×25 cm3 of cyclohexane and dried under reduced pressure (90 Pa; 50° C.) to give 2.35 g of N-[6-chloro-5-[4-(phenylmethoxy)phenyl]-1-[[2-(trimethylsilyl)ethoxy]methyl]-1H-indazol-3-yl]butanamide in the form of white crystals melting at 130° C.

Provenance & Evidence