The two enantiomers of trifluoromethyl-benzo[c]- [1,5]oxazonines,( R)-4 and (S)-4,c an be selectively accessed with high enantiopurity by the Pd-catalyzed ring-expansion reaction of trifluoromethyl-benzo[d][1,3]oxazinones (1)w ith vinyl ethylene carbonates (3)u sing one antipode of ac hiral ligand. Initially,t he reaction proceeds by ad ouble decarboxylative ring-expansion with kinetic resolution of 1 in the presence of aP d-catalyst/chiral ligand to provide (R)-4 with high enantiopurity.Atthe same time,the nonreactive antipode of 1,(S)-1,which was recovered with an impeccable sfactor of up to 713 and an ideal chemical yield, was transferred into the antipode of the products,( S)-4,w ith high enantiopurity by as econd run of the Pd-catalyzed double decarboxylation reaction, but this time without any chiral auxiliary.Thus,both antipodes of the chiral trifluoromethyl heterocycles 4 can be obtained in excellent enantiopurity using only asingle antipode of the chiral catalyst.