Hydrochloric Acid → 2-Biphenyl-3-yl-4-methylpent-4-enoic acid

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A solution of LDA (2.2 mL, 2.0 M in THF) in THF (20 mL) was cooled to 0° C. and then treated with biphenyl-3-ylacetic acid (0.212 g, 1.0 mmol). The mixture was stirred for 40 minutes, cooled to −78° C. and then treated with 3-bromo-2-methylpropene (135 μL, 1.3 mmol). The mixture was stirred for 1 hour, treated with 1 M hydrochloric acid (5 mL) and then diluted with ethyl acetate (50 mL). The organic layer was separated washed with water, brine, dried (MgSO4) and concentrated. Product was purified from the residue by flash column on silica gel (60° A) with 33% ethyl acetate in hexane to provide 2-biphenyl-3-yl-4-methylpent-4-enoic acid (250 mg, 0.93 mmol). 1H NMR (DMSO-d6): 1.71 (s, 3H), 2.52 (m, 2H), 3.68 (dd, 1H), 4.75 (m, 2H), 7.08 (d, 1H), 7.28-7.37 (m, 8H). LCMS: 267.1 (M+H+).

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