An efficient enantioselective palladium-catalyzed trifluoromethylated allylic alkylation of N-substituted glycine ethyl esters using α-(trifluoromethyl)alkenyl acetates as trifluoromethyl-containing allyl precursors is established. A series of optically active glycine ethyl ester derivatives containing a trifluoromethylated allyl substituent are readily synthesized in good yields with superior enantioselectivities.
An efficient strategy for asymmetric trifluoromethylated allylic alkylation of easily available N-substituted glycine ethyl esters with α-(trifluoromethyl)alkenyl acetates has been developed. Catalyzed by a [Pd(C3H5)Cl]2/(R)-BINAP, various trifluoromethyl-containing N-substituted glycine ethyl ester derivatives are afforded with good yields and excellent enantioselectivities. The product can be readily converted into diverse fluoro-substituted species, which shows the practicability of this method.Zum Volltext