Methanol → 3-{4-[2-(4-tert-Butoxycarbonylamino-phenyl)-acetoxy]-3-methyl-phenyl}-2-ethoxy-propionic acid

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The title compound was prepared from 3-{4-[2-(4-tert-butoxycarbonylamino-phenyl)-acetoxy]-3-methyl-phenyl}-2-ethoxy-propionic acid benzyl ester (0.035 g, 0.064 mmol) in the same manner as described for example 1 with the difference that MeOH was used as the solvent instead of EtOAc. The crude product was purified by column chromatography using DCM/iPrOH (95:5) as the eluent and the title compound was obtained as a solid (0.02 g, 68.4%). 1H NMR (500 MHz, CD3OD): δ 7.40-7.42 (d, 2H), 7.29-7.31 (d, 2H), 7.10-7.15 (m, 2H), 6.86-6.87 (d, 1H), 3.84-3.88 (m, 3H), 3.60-3.62 (m, 1H), 3.26-3.29 (m, 1H), 2.96-3.02 (dd, 1H), 2.80-2.86 (dd, 1H), 1.53 (s, 9H), 1.10-1.13 (t, 3H).

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