反应详情

温度

0 °C

N-Methyl-N-{2-[(4-oxo-3,4-dihydroquinazolin-5-yl)oxy]ethyl}acetamide (261 mg, 1.00 mmol) and diiso-propylethylamine (522 μl, 3.00 mmol) were dissolved in DCM (25 ml), and the mixture cooled to 0° C. Phosphorus oxychloride (930 μl, 10 mmol) was added drop wise; the solution was warmed to ambient temperature and stirred for 2 hours. The mixture was cooled to 0° C., and saturated sodium hydrogen carbonate solution (30 ml) was added with vigorous stirring. The stirred mixture was allowed to warm to ambient temperature over 20 minutes. The DCM layer was separated, washed with saturated sodium hydrogen carbonate solution (30 ml), water (30 ml) and brine (30 ml), filtered through a silicone-treated filter paper, and evaporated to give N-{2-[(4-chloroquinazolin-5-yl)oxy]ethyl}-N-methylacetamide as an orange solid (90 mg, 32%); NMR Spectrum (DMSO-d6, 400 MHz, CDCl3) 2.05 (s, 3H), 3.17 (s, 3H), 3.85 (t, 2H), 4.28 (t, 2H), 6.99 (d, 1H), 7.58 (d, 1H), 7.76 (dd, 1H), 8.87 (s, 1H); Mass spectrum 276.4 MH+ (4-OMe derivative—product quenched with MeOH in instrument).

1. temperaturethe solution was warmed to ambient temperature
2. temperatureThe mixture was cooled to 0° C.
3. temperatureto warm to ambient temperature over 20 minutes
4. customThe DCM layer was separated
5. washwashed with saturated sodium hydrogen carbonate solution (30 ml), water (30 ml) and brine (30 ml)
6. filtrationfiltered through a silicone-
7. additiontreated
8. filtrationfilter paper
9. customevaporated