反应详情

温度

130 °C

A mixture of 4-fluorophenol (96.8 g), methyl 6-chloropyridine-3-carboxylate (30 g) and cesium carbonate (285.3 g) in DMSO (875 mL) was stirred and heated to 130° C. over a period of 1.75 h then cooled overnight. The reaction mixture was reheated to ˜150° C. over a period of 1.5 h, kept at this temperature for ˜1 h, then cooled to ˜40° C. and poured into water (4 L). The aqueous solution was extracted with ether (1.0 L) then adjusted to pH7-8 by addition of 2M HCl. The solution was extracted with further ether (2×1.0 L), then adjusted to pH 2 by addition of 2M HCl causing precipitation of a solid. The precipitate was collected by filtration, washed with water and dried overnight at 40° C. in vacuo to give the title compound as a beige/pink solid (36.7 g).

1. temperaturethen cooled overnight
2. waitkept at this temperature for ˜1 h
3. temperaturecooled to ˜40° C.
4. extractionThe aqueous solution was extracted with ether (1.0 L)
5. additionthen adjusted to pH7-8 by addition of 2M HCl
6. extractionThe solution was extracted with further ether (2×1.0 L)
7. additionadjusted to pH 2 by addition of 2M HCl causing precipitation of a solid
8. filtrationThe precipitate was collected by filtration
9. washwashed with water
10. customdried overnight at 40° C. in vacuo