Asymmetric alkylation of pseudoephedrine alpha-fluoropropionamide (1)
affords alpha-alkylated products efficiently and with excellent stereo
control at the newly formed tertiary alkyl fluoride center. Mild alkal
ine hydrolysis of the products provides the corresponding carboxylic a
cids with high enantiomeric excess. (C) 1997 Elsevier Science Ltd.