Keywords
[3+2] cycloaddition
GPCR privileged ligands
photoaffinity labeling
silver(t) catalysis
tetrazoles
α-diazo acetamides
Abstract
A four-step approach to 2-aryl-2H-tetrazole-5-carboxamides bearing GPCR-focused N-substituted piperazine residues involves ‘SAFE’ diazotransfer onto 1-(piperazin-1-yl)butane-1,3-diones followed by [3+2] cycloaddition of arenediazonium cations at the intermediate ααα-diazo acetamides. The compounds prepared are intended for photoaffinity labeling of aminergic G-protein coupled receptors.
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