4-(Trifluoromethoxy)phenylboronic acid → HCID 178498911, compound

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4-Hydroxy-6-(2-methoxy-phenyl)-2-oxo-2H-thiochromene-3-carboxylic acid methyl ester was prepared from 6-bromo-4-hydroxy-2-oxo-2H-thiochromene-3-carboxylic acid methyl ester under conditions analogous to Example 7(a) using 4-trifluoromethoxy-phenylboronic acid. 1H NMR (200 MHz, CDCl3): δ (ppm)=8.534 (s, 1H), 7.782 (d, 1H), 7.639 (d, 2H), 7.444 (d, 1H), 7.320 (d, 2H), 4.026 (s, 3H).

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