Asymmetric synthesis of tailor-made α-amino acids by chiral auxiliaries: Glycine equivalent approach

Tailor-made α-amino acids have played an important role in current life science research and biomedical development. Among the methodologies of α-amino acid asymmetric synthesis, chiral auxiliary strategy received most intensive and extensive investigations. Recent development in this strategy was outlined. Detailed critical review on the glycine equivalent approach in the last ten years was given.