反应条件
1: Phosphorus pentachloride
2: CHCl3; benzene
3: 9 percent / Trioxane, CH3SO3H, Acetic anhydride / 1,2-dichloro-ethane / 4 h / 35 °C
4: 44 percent / Trifluoromethanesulphonic acid, Trifluoromethanesulphonic anhydride / 1,2-dichloro-ethane / 3 h / 35 °C
View Scheme
参考文献
Orazi; Corral; Bravo
Journal of Heterocyclic Chemistry, 1986 , vol. 23, # 6 p. 1701 - 1708
