Reaktion #737378

Reaktionsgleichung

3-chloro-4-hydroxybenzoic acid

ethyl 6-chloro-7-fluoro-2-(trifluoromethyl)-2H-1-benzopyran-3-carboxylate

potassium carbonate

→

title compound

7-(4-Carboxy-2-chloro-phenoxy)-6-chloro-2-(trifluoromethyl)-2H-1-benzopyran-3-carboxylic Acid

Reaktionsbedingungen

Vorschrift

The title compound was prepared from 3-chloro-4-hydroxybenzoic acid and ethyl 6-chloro-7-fluoro-2-(trifluoromethyl)-2H-1-benzopyran-3-carboxylate (Example 183, Step 2) via a procedure similar to that described in Example 183, Steps 3 and 4. (Note: In the step similar to Example 183, Step 3, an additional equivalent of potassium carbonate was added.) mp >300° C. 1H NMR (acetone-d6/300 MHz) 8.18 (d, 1H, J=2.0 Hz), 8.03 (dd, 1H, J=8.5 Hz 2.0 Hz), 7.93 (s, 1H), 7.78 (s, 1H), 7.23 (d, 1H, J=8.7 Hz), 6.77 (s, 1H), 5.87 (q, 1H, J=7.0 Hz). 19F NMR (acetone-d6/282 MHz) −79.4 (d, J=6.5 Hz). ESHRMS m/z 446.9625 (M−H, Calc'd 446.9650). Anal. Calc'd for C18H9Cl2F3O6: C, 48.13; H, 2.02 ; Cl, 15.79. Found: C, 47.96; H, 1.90; Cl, 15.65.

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