Tetrahydrofuran → HCID 117737278, compound

Participants

Reaction Steps

A solution of perfluorophenyl 1-(5-ethoxy-2,3′-difluoro-[1,1′-biphenyl]-4-yl)-2-oxo-1,2-dihydroquinoline-6-sulfonate (398 mg, 0.638 mmol), isoxazol-3-amine (66.0 pdr, 0.894 mmol) and THF (6383 μl) was cooled in an ice-bath for 15 min, then lithium bis (trimethylsilyl)amide (1M in THF) (1596 μl, 1.596 mmol) was added dropwise. After 1.5 h, the mixture was diluted with 1N aq. HCl and EtOAc. The layers were separated, and the organic layer was washed with 1N aq. HCl. The aq. layers were combined and extracted with EtOAc (2×). The combined organic extracts were dried over sodium sulfate, filtered, and concentrated. The crude material was absorbed onto a plug of silica gel and purified by chromatography through a Redi-Sep pre-packed silica gel column (40 g), eluting with a gradient of 0% to 70% EtOAc in heptane, to provide 1-(5-ethoxy-2,3′-difluoro-[1,1′-biphenyl]-4-yl)-N-(isoxazol-3-yl)-2-oxo-1,2-dihydroquinoline-6-sulfonamide (270 mg, 81% yield) as light-yellow solid. m/z [M+H]+=524.0. NMR (400 MHz, DMSO-d6) δ ppm 0.97 (t, J=6.99 Hz, 2 H) 4.01-4.13 (m, 2 H) 6.42 (s, 1 H) 6.82 (d, J=9.68 Hz, 1 H) 6.88 (d, J=9.10 Hz, 1 H) 7.27-7.37 (m, 1 H) 7.43 (d, J=6.94 Hz, 1 H) 7.50-7.67 (m, 4 H) 7.86 (dd, J=8.95, 2.20 Hz, 1 H) 8.24 (d, J=9.59 Hz, 1 H) 8.37 (d, J=2.05 Hz, 1 H) 8.69 (s, 1 H) 11.66 (br. s., 1H).

Provenance & Evidence