Potassium Carbonate → 3-Hydroxy-5-(2-methyl-allyloxy)-benzoic acid methyl ester

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The title compound was prepared in a similar manner as described for Intermediate 1a, from methyl 3,5-dihydroxybenzoate (15.0 g, 89.2 mmol), potassium carbonate (24.7 g, 178.4 mmol) and 3-bromo-2-methyl-propene (9.0 mL, 89.2 mmol). Purification by column chromatography eluting with 15% EtOAc in hexanes gave a pale yellow solid (7.80 g, 39% yield). 1H NMR (400 MHz, CDCl3) δ 7.13-7.22 (m, 2 H) 6.66 (t, J=2.27 Hz, 1 H) 5.81 (s, 1 H) 5.06-5.16 (m, 1H) 4.93-5.04 (m, 1H) 4.44 (s, 2 H) 3.91 (s, 3 H) 1.68-1.94 (m, 3 H); LCMS for C12H14O4 m/z 223.10 (M+H)+.

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