Synthesis of glycoconjugate carbonic anhydrase inhibitors by ruthenium-catalysed azide-alkyne 1,3-dipolar cycloaddition
作者:Adam J. Salmon、Michael L. Williams、Alfonso Maresca、Claudiu T. Supuran、Sally-Ann Poulsen
DOI:10.1016/j.bmcl.2011.08.066
日期:2011.10
Carbonic anhydrase IX (CA IX) is a recently validated target for the development of new cancer therapies. In this Letter we describe the synthesis and CA inhibition of a novel series of carbohydrate-based 1, 5-disubstituted-1,2,3-triazole benzenesulfonamides. The key step of our synthesis is the regioselective Huisgen's 1,3-dipolar cycloaddition reaction (1,3-DCR) from carbohydrate azide substrates and 4-ethynylbenzenesulfonamide using a ruthenium-catalysed azide-alkyne cycloaddition (RuAAC). Our findings identified a number of triazole inhibitors (compounds 18, 19, 21-23, and 26) that block CA IX activity with inhibition constants less than 10 nM. One inhibitor (compound 17) possessed very good selectivity for CA IX over off-target CAs. These CA inhibitors have developmental potential to selectively target cancer cells, leading to cell death. (C) 2011 Elsevier Ltd. All rights reserved.