3-{3-Benzyl-4-[2-(5-methyl-2-phenyl-oxazol-4-yl)-acetoxy]-phenyl}-2-ethoxy-propionic acid benzyl ester → 4-[2-Ethoxy-2-(2,2,2-trichloro-ethoxycarbonyl)-ethyl]-benzoic acid 4-methane sulfonyloxy-benzyl ester

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Reaction Steps

The title compound was prepared from 4-[2-ethoxy-2-(2,2,2-trichloro-ethoxy carbonyl)-ethyl]-benzoic acid (0.032 g, 0.087 mmol) and methanesulfonic acid 4-hydroxymethyl-phenyl ester (0.018 g, 0.09 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 title compound as a solid (0.023, 47%). 1H NMR (400 MHz, CDCl3): δ 7.96-7.98 (d, 2H), 7.47-7.49 (d, 2H), 7.33-7.35 (d, 2H), 7.27-7.29 (d, 2H), 5.33 (s, 2H), 4.68-4.81 (q, 2H), 4.15 (m, 1H), 3.65 (m, 1H), 3.32 (m, 1H), 3.08-3.15 (m, 2H), 3.13 (s, 3H), 1.13 (t, 3H).

Provenance & Evidence