The direct alkynylation reaction of 1,3,4-oxadiazoles with alkynyl bromides efficiently proceeds in the presence of a copper catalyst at room temperature to create the corresponding heteroaryl−alkynyl linkage in good yields. This direct coupling provides a rapid and convergent access to oxadiazole core π-conjugated systems.
The simplest coupling: Copper‐mediated direct oxidative cross‐coupling of 1,3,4‐oxadiazoles and oxazoles with terminal alkynes proceeds through cleavage of sp2 CH and sp CH bonds to furnish the corresponding alkynylazoles in good yields. The reaction is tolerant toward various substitution patterns of substrates and allows the facile construction of azole‐core π‐conjugated systems.