反应详情

A solution of 3-(4-allyloxyphenyl)-2-methyl-2-phenoxy-propionic acid ethyl ester (475 mg, 1.39 mmol) in dimethylaniline (1.5 mL) was heated at reflux for 18 h. After cooling to ambient temperature, the reaction mixture was partitioned between ethyl acetate and 1N H2SO4. The organic phase was dried (MgSO4), filtered and concentrated. The residue was purified by column chromatography (100 mL SiO2, hexanes to 30% ethyl acetate/hexanes) to provide the desired product (343 mg, 72%) as a pale yellow oil: 1H NMR (400 MHz, CDCl3) δ 7.23 (t, J=8.4 Hz, 2H), 7.02–6.96 (m, 3H), 6.83 (d, J=8.8 Hz, 2H), 6.72 (d, J=7.6 Hz, 1H), 6.05 (m, 1H), 5.16–5.09 (m, 2H), 4.21 (q, J=6.8 Hz, 2H), 3.38 (d, J=6.4 Hz, 2H), 3.25 (A of AB, J=13.6 Hz, 1H), 3.10 (B of AB, J=13.6 Hz, 1H), 1.41 (s, 3H), 1.23 (t, J=6.8 Hz, 3H).

1. temperatureat reflux for 18 h
2. customthe reaction mixture was partitioned between ethyl acetate and 1N H2SO4
3. dry with materialThe organic phase was dried (MgSO4)
4. filtrationfiltered
5. concentrationconcentrated
6. customThe residue was purified by column chromatography (100 mL SiO2, hexanes to 30% ethyl acetate/hexanes)