Synthesis of 1,2,3-triazol-1-yl-methaneboronic acids via click chemistry: an easy access to a new potential scaffold for protease inhibitors.

Stereoselective synthesis of previously unreported 1,2,3-triazol-1-yl-methaneboronic acids has been achieved from azidomethaneboronates by Copper-catalyzed Azide-Alkyne Cycloaddition (CuAAC). The proximity of the cycloaddition reaction center to the boronic group is not detrimental for the stability of the -carbon-boron bond nor to the stereoisomeric composition, further expanding the field of application of click chemistry to new boronate substrates and offering a new potential scaffold for protease inhibitors.