Resin-bound peptides can be cleaved from the Kaiser oxime resin using the tetra-nbutylammonium salts of side-chain protected amino acids to directly provide the a-aminoprotected (Boc), side-chain protected peptide. Complete experimental details are provided. The protected peptide fragments can be pu
A useful method for the preparation of fully protected peptide acids and esters
✍ Scribed by André Pichette; Normand Voyer; Rémi Larouche; Jean-Christophe Meillon
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- French
- Weight
- 175 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
Resin bound peptides can be cleaved from the Kaiser oxime resin using various oxygen nucleophiles (H20, CH3OH, PhCH2OH) with DBU. Fully protected peptide acids and esters are obtained rapidly and with good yields using this new method of cleavage.
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Papain catalyzed synthesis of glyceryl esters of BOC(Z)-protected amino acids and peptides was performed at 40-50°C in a 50 molar excess of glycerol. Equilibrium was achieved in 6-7 h. The maximal yield of esters (50-70%) was obtained at 10% of water and pH 3.2-3.4. A lower water concentration resul