Hydrochloric Acid → Methyl trans-2-(4-bromobenzoyl)cyclopropanecarboxylate

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To a solution of trans-2-(4-bromobenzoyl)cyclopropanecarboxylic acid (9.43 g, 32.59 mmol) in MeOH (200 mL) was added 2,2-dimethoxypropane (10.18 g, 97.77 mmol) and HCl (4.0 M in dioxane, 4.0 mL). The resulting solution was stirred at 40° C. overnight, and then evaporated to dryness. The resulting residue was purified by flash chromatography (Biotage Flash 40M) using 15 to 25% ethyl acetate in hexanes to afford methyl trans-2-(4-bromobenzoyl)cyclopropanecarboxylate (7.7 g, 83%). 1H NMR (400 MHz, CD2Cl2) δ 1.68 (m, 2H), 2.37 (m, 1H), 3.21 (m, 1H), 3.65 (s, 3H), 7.68 (m, 2H), 7.90 (m, 2H).

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