Synthesis 2009(5): 809-814  
DOI: 10.1055/s-0028-1083362
PAPER
© Georg Thieme Verlag Stuttgart ˙ New York

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
Further Information

Publication History

Received 3 October 2008
Publication Date:
11 February 2009 (online)

Abstract

Under continuous removal of water, the industrial protease Alcalase allows selective synthesis of α-carboxylic acid methyl, ethyl, benzyl, allyl, 2-(trimethylsilyl)ethyl, and tert-butyl esters of amino acids and peptides under mild conditions in very high yields. The purified yields range from 72% to 92%.