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Versatile Selective α-Carboxylic Acid Esterification of N-Protected Amino Acids and Peptides by Alcalase

Timo Nuijensa,b, Claudia Cusana, John A. W. Kruijtzerb, Dirk T. S. Rijkersb, Rob M. J. Liskampb, Peter J. L. M. Quaedflieg*a
a DSM Pharmaceutical Products, Innovative Synthesis & Catalysis, P.O. Box 18, 6160 Geleen, MD, The Netherlands
Fax: +31(46)4767604 ; e-Mail: peter.quaedflieg@dsm.com;
b Medicinal Chemistry and Chemical Biology, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, P.O. Box 80082, 3508 Utrecht, TB, The Netherlands