Synthesis of 2-amino-3-fluoroacrylic acid containing peptides.

[reaction: see text] Peptides containing (E)- and (Z)-3-fluorodehydroalanine have been prepared from serine via a fluoro-Pummerer rearrangement. The resulting electrophilic moieties may be useful affinity labels for the identification of the targets of dehydroamino acid containing natural products that act by covalent mechanisms.