Cesium carbonate → HCID 67490962, compound

Participants

Reaction Steps

A mixture of (1S,5R)-1-tert-butoxycarbonylamino-6,6-difluoro-3-azabicyclo[3.3.0]octane (318 mg, 1.21 mmol), ethyl 7-bromo-6-fluoro-1-[(1R,2S)-2-fluorocyclopropyl]-1,4-dihydro-8-methyl-4-oxoquinoline-3-carboxylate (426 mg, 1.10 mmol), 1,1′-bis(diphenylphosphino)ferrocene (183 mg, 0.331 mmol), tris(dibenzylideneacetone)dipalladium(0) (101 mg, 0.110 mmol) and cesium carbonate (718 mg, 2.20 mmol) in dioxane (5.51 mL) was stirred at room temperature for 30 minutes, and at 100° C. for 11 hours under argon atmosphere. The mixture was diluted with water, and extracted with ethyl acetate and chloroform (3×). The combined organic layer was dried over anhydrous sodium sulfate, and the solvent was distilled off under reduced pressure. The residue was purified by silica gel flush column chromatography (ethyl acetate/hexane=10:90→50:50→67:33→ethyl acetate) to afford 436 mg of the title compound as a pale yellow foam.

Provenance & Evidence