| 摘要 |
The invention relates to a a process for the preparation of a compound of formula I comprising a) reacting a compound of formula II in the presence of magnesium or an organometallic reagent of formula III R1M2X (III), wherein R1 is CI-C4alkyl; M2 is Li or Mg and X is halogen or absent; with a compound of formula IV CF3-C(O)-R2 (IV), wherein R2 is halogen, hydroxyl, CI-C4alkoxy, (di-CI-C4alkyl)amino, OC(O)CF3, phenoxy or OM1; wherein M1 is Lithium, Magnesium, Sodium or Potassium; to a compound of formula V, and b) reacting the compound of formula V with alkali metal fluoride in the presence of catalytic amounts of a phase transfer catalyst in the presence of a polar solvent to the compound of formula I. |
