By courtesy of:
Samia Aı1t-Mohand, Naoto Takechi, Maurice Medebielle, and William R. Dolbier, Jr.*
OL, 2001, 3, No. 26, 4271
and
Novel Nucleophilic Trifluoromethylation of Vicinal Diol Cyclic Sulfates
Naoto Takechi, Samia Ait-Mohand, Maurice Medebielle, and William R. Dolbier, Jr.*
Org. Lett. 2002, 4671
and another approach:
Trifluoroacetic Acid Derivatives as Nucleophilic Trifluoromethylating Reagents
Lukas Jablonski, Jérôme Joubert, Thierry Billard,* Bernard R. Langlois*
Synlett, 2003, 230