Synthesis 2016; 48(03): 365-378
DOI: 10.1055/s-0035-1560523
paper
© Georg Thieme Verlag Stuttgart · New York

Microwave-Assisted Synthesis of 2,2′-Azopyridine-Labeled Amines, Amino Acids, and Peptides

Ilker Avan*
Department of Chemistry, Faculty of Science, Anadolu University, 26470 Eskişehir, Turkey   Email: iavan@anadolu.edu.tr
› Author Affiliations
Further Information

Publication History

Received: 21 July 2015

Accepted after revision: 16 October 2015

Publication Date:
27 October 2015 (online)


Dedicated to the memory of Alan Roy Katritzky (1928–2014)

Abstract

A microwave-assisted procedure for labeling amines, amino acids, and peptides with 2,2′-azopyridines (2,2′-AzPy) is described using the corresponding 2,2′-azopyridine-diacylbenzotriazoles. The efficiency of the procedure is proven by the generation of three constitutionally isomeric sets of 2,2′-AzPy-X,X′-labeled amino conjugates (where X = 4, 5, 6) including amines, amino acids, and peptides. Microwave-assisted synthesis conditions provide good to excellent yields in less than 15 minutes with retention of original chirality. A trans-to-cis isomerization of the 2,2′-azopyridine-labeled amino conjugate upon laser irradiation at 325 nm is visualized with UV and NMR spectroscopy.

Supporting Information