反应详情

温度

170 °C

step 2—A 250 mL flask was charged with 5-chloro-3-methoxy-benzonitrile (7.0 g, 41.766 mmol) and 2,4,6-collidine (100 mL). The mixture was heated to 170° C. and LiI (16.76 g, 125.298 mmol) was added and the reaction mixture was heated for 4 h. When R-3b was consumed the reaction was cooled to RT and quenched with 10% aqueous HCl. The resulting mixture was extracted with EtOAc and washed with water and brine. The EtOAc extract was dried over (Na2SO4) and filtered. The solvent was removed in vacuo to afford a yellow oil which was purified by silica gel chromatography eluting with EtOAc/hexane (10:90) to afford 6.0 g (94%) of 3-chloro-5-hydroxy-benzonitrile.

1. temperaturethe reaction mixture was heated for 4 h
2. customWhen R-3b was consumed the reaction
3. temperaturewas cooled to RT
4. customquenched with 10% aqueous HCl
5. extractionThe resulting mixture was extracted with EtOAc
6. washwashed with water and brine
7. extractionThe EtOAc extract
8. dry with materialwas dried over (Na2SO4)
9. filtrationfiltered
10. customThe solvent was removed in vacuo
11. customto afford a yellow oil which
12. customwas purified by silica gel chromatography
13. washeluting with EtOAc/hexane (10:90)