Fluorinated Amino Acid Synthesis

4‐Benzyl‐L‐aspartate, 4‐nitrophenyl chloroformate, dithiothreitol, trifluoromethanesulfonic acid, and trifluoroacetic acid were obtained from TCI (Eschborn, Germany). L‐phenylalanine was purchased from Carl Roth (Karlsruhe, Germany). S‐carbobenzoxy‐L‐cysteine was obtained from BLD Pharmatech GmbH. Anhydrous dimethylacetamide (DMAc) was obtained from Acros (Geel, Belgium). S‐Benzyl‐L‐cysteine, hydrogen peroxide, and n‐butylamine were purchased from Alfa Aesar (Kandel, Germany). PFD was obtained from Fluorochem Chemicals (Derbyshire, UK). Methanol, ethyl acetate and diethyl ether were purchased from Fisher Scientific (Schwerte, Germany). Finally, n‐hexane and dichloromethane were obtained from VWR International (Darmstadt, Germany) and acetonitrile was purchased from Carl Roth (Karlsruhe, Germany).