Tri(butyl)vinyltin → 6-Ethenyl-1-(3-fluoro-4-hydroxyphenyl)-1H-indazol-4-ol

Participants

Reaction Conditions

Reaction Steps

To a solution of 6-bromo-1-(3-fluoro-4-hydroxyphenyl)-1H-indazol-4-ol (360 mg, 1.11 mmol) (E5) in dimethoxyethane (10 mL) was added dichlorobis(tris-o-tolylphosphine)palladium (44 mg, 0.056 mmol) and tributylvinyltin (0.65 mL, 2.22 mmol). The reaction mixture was heated at 90° C. under argon overnight. After cooling to room temperature, the mixture was filtered through a pad of celite. The filtrate was concentrated and the crude product purified by silica gel chromatography eluting with 5-100% ethyl acetate in hexane. The product was further purified by MDAP to yield the title compound (E6) (101 mg).

Provenance & Evidence