Tolylboronic acid → HCID 178498922, compound

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4-Hydroxy-2-oxo-7-p-tolyl-2H-thiochromene-3-carboxylic acid methyl ester was prepared from 7-bromo-4-hydroxy-2-oxo-2H-thiochromene-3-carboxylic acid methyl ester (Example 5e) and 4-methyl-phenylboronic acid under conditions analogous to Example 7(a). 1H NMR (200 MHz, CDCl3): δ (ppm)=15.23 (s, 1H), 8.38 (d, J=8.7 Hz, 1H), 7.64-7.51 (m, 4H), 7.38-7.26 (m, 2H), 4.02 (s, 3H), 2.41 (s, 3H).

Provenance & Evidence