反应详情

According to the procedure described in Example 13 for the preparation of 2-acetoxy-1-(4(S)-benzyl-2,2-dimethyl-oxazolidin-3-yl)-2-(biphenyl-4-yl-1H-pyrrol-3-yl)-ethanone, 2-(2-biphenyl-4-yl-furan-5-yl)-2-hydroxy-acetic acid ethyl ester was acylated to furnish in 83% yield 2-acetoxy-2-(2-biphenyl-4-yl-furan-5-yl)-acetic acid ethyl ester which was used without purification. Flash column chromatography with 0-20% EtOAc/hex as eluant gave an analytically pure pink solid, mp 136-140° C. 1H NMR: δ 7.74 (d, 2H, J=8.5 Hz), 7.63 (d, 4H, J=8.5 Hz), 7.46 (t, 2H, 7.4 Hz), 7.36 (t, 1H, J=7.2 Hz), 6.68 (d, 1H, J=3.7 Hz), 6.58 (d, 1H, J=3.3 Hz), 6.57 (s, 1H), 4.29 (q, 2H, J=7.0 Hz), 2.21 (s, 3H), 1.29 (t, 3H, J=7.2 Hz). Anal. Calculated for C22H20O5: C, 72.51; H, 5.53. Found: C, 72.61; H, 5.63.