Activation of a carboxy group by dialkyl pyrocarbonates. Synthesis of symmetrical anhydrides and aryl esters of N-protected amino acids using di-tert-butyl pyrocarbonate as condensing reagent
Peptide Coupling Reagents; VIII. A High Yield Preparation of Phenyl Esters of Amino Acids using Benzotriazolyloxytris[dimethylamino]phosphonium Hexafluorophosphate (BOP Reagent)