反应详情

To a solution of (5-methyl-2-phenyl-oxazol-4-yl)-acetic acid (3.29 g, 15.2 mmol) and (S)-2-ethoxy-3-(4-hydroxy-phenyl)-propionic acid benzyl ester (4.56 g, 15.2 mmol) in dry DCM (70 mL) was added EDC×HCl (3.49 g, 18.22 mmol) and DMAP (0.37 g, 3.03 mmol) under nitrogen atmosphere. After stirring for 1 h at ambient temperature the mixture was extracted with saturated aq. NaHCO3, aq. HCl (0.05N) and with saturated aq. NaHCO3 again. The organic layer was dried and the remaining crude product purified by HPLC. The title compound was obtained as an oil (4.15 g, 54.7%). 1H NMR (400 MHz, CDCl3): δ 7.99-7.80 (d, 2H), 7.25-7.43 (m, 8H), 7.18-7.20 (d, 2H), 6.99-7.01 (d, 2H), 5.12 (s, 2H), 4.01-4.04 (m, 1H), 3.80 (s, 2H), 3.57-3.61 (m, 1H), 3.31-3.35 (m, 1H), 2.98-3.00 (m, 2H), 2.41 (s, 3H), 1.11-1.15 (t, 3H).

1. extractionwas extracted with saturated aq. NaHCO3, aq. HCl (0.05N) and with saturated aq. NaHCO3 again
2. customThe organic layer was dried
3. customthe remaining crude product purified by HPLC