反应详情

温度

100 °C

2,4-dichloro-7-methyl-7H-pyrrolo[2,3-d]pyrimidine (2.39 g, 11.8 mmol) was treated with a 2M aqueous potassium hydroxide solution (70 mL, 140 mmol). The reaction was warmed to 100° C., where it was stirred overnight. The reaction was allowed to cool down to room temperature gradually, where it stirred for an additional 2 nights. The reaction was brought to pH ˜7-8 with a 3N aqueous hydrochloric acid solution. The resulting light yellow mixture was cooled in an ice/water bath and filtered, rinsing twice with a small amount of water. The filtrate was brought to pH ˜2-3 with additional 3N aqueous hydrochloric acid solution. The resulting opaque light yellow mixture was filtered through the original filter cake. The solids were dried in vacuo to afford 2-chloro-7-methyl-3,7-dihydro-pyrrolo[2,3-d]pyrimidin-4-one as an off-white solid (2.18 g, 100%). NMR (300 MHz, DMSO-d6) δ ppm 3.67 (s, 3H) 6.46 (d, J=3.39 Hz, 1H) 7.11 (d, J=3.39 Hz, 1H) 12.83 (br. s., 1H). LC-MS calcd. for C7H7ClN3O [(M+H)+] 184, obsd, 183.9.

1. temperatureto cool down to room temperature gradually
2. stirringwhere it stirred for an additional 2 nights
3. temperatureThe resulting light yellow mixture was cooled in an ice/water bath
4. filtrationfiltered
5. washrinsing twice with a small amount of water
6. filtrationThe resulting opaque light yellow mixture was filtered through the original filter cake
7. customThe solids were dried in vacuo