Hydrochloric Acid → 1-(3,3-Dimethyl-2,3-dihydrobenzofuran-5-yl)cyclopropanecarboxylic acid

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Reaction Conditions

Reaction Steps

To a solution of 1-(3,3-dimethyl-2,3-dihydro-benzofuran-5-yl)-cyclopropanecarboxylic acid methyl ester (1 g, 4 mmol) in MeOH (10 mL) was added LiOH (0.40 g, 9.5 mmol). The mixture was stirred at 40° C. overnight. HCl (10%) was added slowly to adjust the pH to 5. The resulting mixture was extracted with ethyl acetate (10 mL×3). The extracts were washed with brine and dried over Na2SO4. The solvent was removed under vacuum and the crude product was purified by preparative HPLC to give 1-(3,3-dimethyl-2,3-dihydrobenzofuran-5-yl)cyclopropanecarboxylic acid (0.37 g, 41%). 1H NMR (400 MHz, CDCl3) δ 7.11-7.07 (m, 2 H), 6.71 (d, J=8 Hz, 1 H), 4.23 (s, 2 H), 1.66-1.63 (m, 2 H), 1.32 (s, 6 H), 1.26-1.23 (m, 2 H).

Provenance & Evidence