A mixture of trifluoroacetylthiopyridine, the sodium salt of 1-hydroxybenzotriazole, and an acylamino acid is able to acylate amino acid esters in high yields with minimal racemization and should, therefore, be useful for fragment condensation reactions in the liquid phase.
U. Schmidt and H. Griesser, J. Chem. Soc., Chem. Commun., 1993, 1461 DOI: 10.1039/C39930001461
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