ACTIVATION OF CARBOXYLIC-ACIDS BY PYROCARBONATES - APPLICATION OF DI-TERT-BUTYL PYROCARBONATE AS CONDENSING REAGENT IN THE SYNTHESIS OF AMIDES OF PROTECTED AMINO-ACIDS AND PEPTIDES

Amides formation from protected amino acids and peptides was achieved in an easy and convenient one-pot procedure using di-tert-butyl pyrocarbonate as activating agent in the presence of pyridine and ammonium hydrogencarbonate. The method gave good yields and did not induce racemization during the amidation of urethane protected amino acids.