We report a practical synthesis of N-Fmoc protected L-fluoroalanine 6 from L-serine. The key step involves a deoxofluorination reaction which was best achieved using XtalFluor-E in the presence of triethylamine trihydrofluoride. We also report the use of 6 in solid-phase peptide synthesis for the preparation of a model tripeptide demonstrating the possibility of incorporating a fluorinated probe in a peptide without elimination. Furthermore, cleavage of the dipeptide permitted to verify that 6 has a high enantiopurity. (C) 2015 Elsevier Ltd. All rights reserved.
We report a practical synthesis of N-Fmoc protected L-fluoroalanine 6 from L-serine. The key step involves a deoxofluorination reaction which was best achieved using XtalFluor-E in the presence of triethylamine trihydrofluoride. We also report the use of 6 in solid-phase peptide synthesis for the preparation of a model tripeptide demonstrating the possibility of incorporating a fluorinated probe in a peptide without elimination. Furthermore, cleavage of the dipeptide permitted to verify that 6 has a high enantiopurity. (C) 2015 Elsevier Ltd. All rights reserved.