The reaction of chiral 5,6-dihydro-2
H-1,4-oxazin-2-ones with TMSCF
3 in the presence of a suitable activator leads to trifluoromethyl lactols,which can be selectively reduced to
anti-
![](/images/gifchars/beta2.gif)
-amino-
![](/images/gifchars/alpha.gif)
-trifluoromethyl alcohols. The corresponding syn diastereoisomers are obtained when thestarting imines are reduced and the nitrogen atom is conveniently protected. In addition, a novel rearrangement of the CF
3 group in the lactolintermediates has been observed. This represents a formal CF
3 addition to the imine function in the starting substrates.