Sodium Hydroxide → HCID 12018480, compound

Participants

Reaction Steps

Aqueous NaOH (1.31 mL, 3.277 mmol, 2.5 M solution) was added in one portion to the ester (Step 1) (0.880 g, 2.731 mmol) in THF:EtOH:H2O (7:2:1, 10 mL). The resulting solution was stirred for 60 hours. The reaction mixture was partially concentrated in vacuo to remove the organic solvents and was diluted with H2O. The resulting aqueous solution was washed with diethyl ether, sparged with nitrogen to remove trace ether, and acidified with concentrated HCl. The resulting oily suspension was extracted with diethyl ether. The combined organic phases were dried over MgSO4, filtered and concentrated in vacuo yielding the title compound (0.483 g, 60%) as an oil which solidified as a white crystalline mass: mp 134.7-136.2° C. 1H NMR (acetone-d6/300 MHz) 7.97 (s, 1H), 7.73 (s, 1H), 7.67 (dd, 1H, J=8.5, 1.0 Hz), 7.17 (d, 1H, J=8.5 Hz), 6.89(t, 1H, J=56.2 Hz), 5.90 (q, 1H, J=7.1 Hz). FAB-ESLRMS m/z 293 (M−H). EIHRMS m/z 293.0235 (M−H, Calc'd 293.0237). Anal. Calc'd for C12H7F5O3: C, 49.00; H, 2.40. Found: C, 48.78; H,2.21.

Provenance & Evidence