Acetic Acid → HCID 9801143, compound

Participants

Reaction Steps

To a stirred solution of chlorine in acetic acid (3.5 mL of 0.24 M solution, 0.84 mmol) was added 6-(4-methoxyphenoxy)-2-(trifluoromethyl)-2H-1-benzopyran-3-carboxylic acid (0.31 g, 0.85 mmol) (Example 7). After 1 hour additional chlorine in acetic acid (1.5 mL of 0.24 M solution, 0.36 mmol) was added. After three additional hours additional chlorine in acetic acid (0.25 ml of 0.25 M solution, 0.06 mmol) was added. After 2.5 hours the reaction was quenched with aqueous 10% sodium bisulfite solution and the resulting mixture extracted with ethyl acetate. The organic phase was washed with water, brine, dried over MgSO4, filtered, and concentrated in vacuo yielding a brown oil. The oil was dissolved in a minimum of hexanes which induced crystallization. Vacuum filtration of the mixture provided the title compound as yellow crystals (0.18 g, 53%): mp 205–207° C. 1H NMR (acetone-d6/300 MHz) 7.89 (s, 1H), 6.97–7.18 (m, 6H), 5.83 (q, 1H, J=7.0 Hz), 3.90 (s, 3H). FABLRMS m/z 400 (M+). FABHRMS m/z 399.0249 (M−H, Calc'd 399.0247). Anal. Calc'd for C18H12ClF3O5: C, 53.95; H, 3.02; Cl, 8.85. Found: C, 53.78; H, 3.08; Cl, 8.98.

Provenance & Evidence