2-(Trifluoromethyl)benzeneboronic acid → HCID 178498909, compound

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4-Hydroxy-2-oxo-6-(2-trifluoromethyl-phenyl)-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 2-trifluoromethyl-phenylboronic acid. 1H NMR (200 MHz, CDCl3): δ (ppm)=8.572 (s, 1H), 7.838-7.676 (m, 4H), 7.487-7.354 (m, 2H), 4.028 (s, 3H).

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