Abstract N-Fmoc-Protected (Fmoc=(9H-fluoren-9-ylmethoxy) carbonyl) β-amino acids are required for an efficient synthesis of β-oligopeptides on solid support. Enantiomerically pure Fmoc-β 3-amino acids β 3: side chain and NH 2 at C (3)(= C (β)) were prepared from Fmoc- protected (S)-and (R)-α-amino acids with aliphatic, aromatic, and functionalized side chains, using the standard or an optimized Arndt-Eistert reaction sequence. Fmoc-β 2-Amino ...