A new synthesis of optically active β-indolyl and pyrrolyl N-tosyl α-amino acids has been developed which uses readily available starting materials and proceeds with a high degree of enantioselection, giving the α-amino acids with up to 96% enantiomeric purity in 89% yield using 1–5 mol% of a chiral copper(I)–Tol-BINAP catalyst.
M. Johannsen, Chem. Commun., 1999, 2233 DOI: 10.1039/A906758B
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