copper-catalyzed azide-alkyne cycloaddition

The copper-catalyzed azide-alkyne cycloaddition (CuAAC) is a highly efficient chemical reaction that joins two molecules together. This reaction is a key component of "click chemistry," a field focused on creating complex molecules through simple, rapid, and high-yielding reactions.1

In CuAAC, an azide group (-N₃) on one molecule is reacted with an alkyne group (a carbon-carbon triple bond) on another molecule. The addition of copper ions as a catalyst enables these two molecules to snap together, forming a stable ring structure called a triazole. This process is valuable in various fields, including materials science, pharmaceutical development, and the synthesis of new organic compounds. Morten P. Meldal developed this reaction independently and was awarded the Nobel Prize in Chemistry in 2022 for his contributions to click chemistry.12