synthesis of a series of α-fluorinated β²- and β³-amino acid derivatives is described. Stereoselective fluorination at the α-carbon of the β³-amino acids was achieved by deprotonation with lithium diisopropylamide followed by treatment with N-fluorobenzenesulfonimide. Fluorination of β²-amino acids employed the chiral auxiliary (4R)-4-benzyl-2-oxazolidinone. The α-fluorinated amino acids and their non-fluorinated
Synthesis and Conformation of Fluorinated β-Peptidic Compounds
作者:Victoria Peddie、Raymond J. Butcher、Ward T. Robinson、Matthew C. J. Wilce、Daouda A. K. Traore、Andrew D. Abell
DOI:10.1002/chem.201200313
日期:2012.5.21
that, for α‐fluoroamides, the FCC(O)N(H) moiety adopts an antiperiplanar conformation. In addition, a gauche conformation is favoured between the vicinal CF and CN(CO) bonds in N‐β‐fluoroethylamides. This study details the synthesis of a series of fluorinated β‐peptides (1–8) designed to use these stereoelectronic effects to control the conformation of β‐peptide bonds. X‐ray crystal structures of