Carbon Dioxide → 3-Fluoro-4-isopropoxybenzoic acid

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A solution of 639 mg (2.74 mmol) 1-isopropyloxy-2-fluoro-4-bromobenzene (from Step A) in 10 mL of THF at −78° C. was treated with 1.64 mL of 2.0 M n-butyllithium in heptane. After stirring at −78° C. for 30 min, the mixture was poured onto 300 g of crushed dry ice and allowed to warm up to rt. The mixture was partitioned between 100 mL of 2.0 N NaOH and 100 mL of Et2O. The aqueous layer was separated, acidified using 5.0 N HCl to pH 2, and extracted with CH2Cl2 (3×50 mL). The organic layers were combined, dried over MgSO4, and concentrated to afford 380 mg of the title compound: 1H NMR (500 MHz, CDCl3) δ 1.41 (d, J=6.2, 6H), 4.65-4.73 (m, 1H), 7.00 (t, J=8.5, 1H), 7.79-7.87 (m, 2H).

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