反应详情

To 2-(3-(2-methylthiazol-4-yl)phenylamino)pyrimidin-4(3H)-one, 11, (1.0 g, 3.5 mmol) and N,N-dimethyl-aniline (1 mL) is added phosphorus oxychloride (9.5 mL). The resulting mixture is heated to reflux for 15 minutes, cooled to room temperature and concentrated in vacuo. The residue is neutralized to pH 7 with 1M NaOH (aqueous). The organic layer is extracted with ethyl acetate (3×50 mL). The combined organic layers are dried (MgSO4) and concentrated in vacuo. The residue is purified over silica (5% EtOAc in hexanes) to afford 0.50 g (47% yield) of the desired compound. 1H NMR (DMSO-d6, 300 MHz): δ 2.73 (s, 3H), 6.98 (d, J=5.1 Hz, 1H), 7.37 (t, J=8.1 Hz, 1H), 7.57 (d, J=8.1 Hz, 1H), 7.72 (d, J=8.1 Hz, 1H), 7.83 (s, 1H), 8.25 (s, 1H), 8.46 (d, J=5.1 Hz, 1H), 10.08 (s, 1H). MS (ESI, pos. ion) m/z: 303 (M+1).

1. temperatureThe resulting mixture is heated
2. temperatureto reflux for 15 minutes
3. concentrationconcentrated in vacuo
4. extractionThe organic layer is extracted with ethyl acetate (3×50 mL)
5. dry with materialThe combined organic layers are dried (MgSO4)
6. concentrationconcentrated in vacuo
7. customThe residue is purified over silica (5% EtOAc in hexanes)