Methanol → Nav1.7 inhibitor

Participants

Reaction Steps

A 5 mL microwave reaction vial was charged with 1-bromo-5-chloro-4-((3,4-dichlorophenoxy)methyl)-2-fluorobenzene (Preparation 1, 206 mg, 0.54 mmol), molybdenumhexacarbonyl (139 mg, 0.53 mmol), trans-bis(acetato)bis[o-(di-o-tolylphosphino)benzyl]dipalladium(II) (25.9 mg, 0.028 mmol), tri-tert-butylphosphonium tetrafluoroborate (16.8 mg, 0.058 mmol), methanesulphonamide (159 mg, 1.67 mmol) and 1,8-diazabicyclo[5.4.0]undec-7-ene (0.23 mL, 1.56 mmol) in 1,4-dioxane (1.80 mL). The vessel was sealed under air and exposed to microwave irradiation at 140° C. for 15 minutes. Once the reaction had cooled to room temperature the reaction mixture was then concentrated in vacuo to afford a brown oil. The oil was then passed through a short plug of silica eluting with 5% methanol in dichloromethane and fractions containing product were combined and concentrated in vacuo to afford an off white solid (266 mg). A portion of this material (190 mg) was purified by reverse phase column chromatography using the ISCO™ system (30 g ISCO C-18 cartridge) using a gradient of water/0.01% formic acid/acetonitrile to 0.01% formic acid/water as eluant to give the title compound (50 mg, 22%) as a white solid.

Provenance & Evidence