Boron tribromide → HCID 10620412, compound

Participants

Reaction Steps

To a stirred suspension of N-[3-methoxy-4-(4-pyridylsulfonyl)phenyl]-3,3,3-trifluoro-2-hydroxy-2-methylpropanamide (1.05 g, 2.6 mmol) in dry methylene chloride (30 mL) was added boron tribromide (10.4 mL of a 1.0M solution of boron tribromide in methylene chloride, 10.4 mmol). The resulting solution was stirred at reflux for 2 hours. An additional 5 mL of 1.0M boron tribromide solution in methylene chloride was added and the reaction stirred overnight at room temperature. The reaction mixture was diluted with methylene chloride (50 mL) and washed with water. The organic layer was dried (MgSO4) and concentrated in vacuo to yield an oil. Purification by flash column chromatography (20% v/v methanol in ethyl acetate) yielded the title propanamide as a white solid (0.18 g, 18%); mp 188°-189° C. 1H-NMR (250 MHz, d6-DMSO): 1.54 (s, 3H, CH3) 7.35 (d, 1H, J=9.0 Hz, aromatic) 7.51 (s, 1H, OH) 7.61 (s, 1H, aromatic) 7.77 (d, 2H, J=5.5 Hz, aromatic) 7.84 (d, 1H, J=8.9 Hz, aromatic) 8.83 (d, 2H, J=5.5 Hz, aromatic) 10.26 (s, 1H, NH) 11.04 (s, 1H, ArOH). MS (CI, CH4): 391 (M+1). Analysis for C15H13F3N2O5S.0.25 H2O: Calculated: C, 45.63; H, 3.44; N, 7.09. Found: C, 45.51; H, 3.58; N, 6.98.

Provenance & Evidence