2-(4-((Tert-butoxycarbonyl)amino)phenyl)acetic acid → 3-{4-[2-(4-tert-Butoxycarbonylamino-phenyl)-acetoxy]-3-methyl-phenyl}-2-ethoxy-propionic acid benzyl ester

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Reaction Steps

The title compound was prepared from 2-ethoxy-3-(4-hydroxy-3-methyl-phenyl)-propionic acid benzyl ester (38 mg, 0.15 mmol) and (4-tert-butoxycarbonylamino-phenyl)-acetic acid (47 mg, 0.15 mmol) in the same manner as described for 3-{3-benzyl-4-[2-(5-methyl-2-phenyl-oxazol-4-yl)-acetoxy]-phenyl}-2-ethoxy-propionic acid benzyl ester. The crude product was purified by column chromatography using n-heptane/EtOAc (2:3) as the eluent to afford the product as a solid (32 mg, 85%). 1H NMR (400 MHz, CDCl3): δ 7.26-7.38 (m, 9H), 6.99-7.02 (m, 2H), 6.83-6.86 (d, 1H), 6.49 (br s, 1H), 5.12 (s, 2H), 4.00-4.05 (t, 1H), 3.80 (s, 2H), 3.58-3.61 (m, 1H), 3.31-3.36 (m, 1H), 2.94-2.96 (d, 2H), 1.98 (s, 3H), 1.52 (s, 9H), 1.12-1.16 (t, 3H).

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