Azo cyclization: peptide cyclization via azo bridge formation

作者：Fridkin G; Gilon C^*

来源：Journal of Peptide Research, 2002, 60(2): 104-111.

DOI：10.1034/j.1399-3011.2002.02993_1.x

• azo cyclization
• cyclic azo GnRH
• cyclic azo peptides
• cyclic azo RGD
• cyclic azo SV40NLS
• cyclic azo Tuftsin
• cyclic azo VIP

A novel method for peptide cyclization in solution: the azo cyclization is presented herein. Ring closure by forming an azo bridge was achieved in situ by connecting the corresponding side chains of para amino phenylalanine (Pap) residues to those of tyrosine or histidine residues present in the corresponding linear precursors. The reaction was performed using an initial diazotization step in acidic media followed by intramolecular azo cyclization in a mild basic media. This new method of cyclization is facile, applicable to various sequences and results in a high yield of pure products and hence is suggested as an additional method for peptide cyclization. Here we report the successful utilization of this method for the synthesis of 10 new cyclic azo peptides, derived from RGD, GnRH, Tuftsin, VIP and SV40 NLS.

• 出版日期2002-8