Hydrochloric Acid → 3-Iodo-4-methoxybenzoic acid

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Lithium hydroxide (72 mg, 1.71 mmol) was added to a mixture of methyl 3-iodo-4-methoxybenzoate (100 mg, 0.342 mmol) in 3.0 mL of a 3:1:1 THF-MeOH-water solution at room temperature. The mixture was stirred for 8 hours in the dark and than diluted with H2O (2 mL). The solution was acidified to pH=2 by the dropwise addition of concentrated HCl. The solution was extracted twice with EtOAc (10 mL portions) and the combined organic layers dried (Na2SO4), filtered, and concentrated to afford acid 26 (95 mg, 100%) as a yellow solid that was suitable for use without further purification: 1H NMR (400 MHz, DMSO) δ 8.24 (d, J=2.0 Hz, 1H), 7.92 (dd, J=2.0, 8.7 Hz, 1H), 7.07 (d, J=8.7 Hz, 1H), 3.88 (s, 3H).

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