Fig. 1
From: Non-canonical amino acid labeling in proteomics and biotechnology
Azide-alkyne cycloaddition reactions. a Copper(I)-catalyzed [3 + 2] azide-alkyne cycloaddition (CuAAC). b [3 + 2] cycloaddition of azides and strain-promoted alkynes (cyclooctynes) (SPAAC)