2009/10/08 by Andrei Poloukhtine, Andrei A. Poloukhtine, Ngalle Eric Mbua +4 · 410 citations
Biochemistry, Genetics and Molecular Biology · Chemistry · #Acetylene #Advanced Biosensing Techniques and Applications #Advanced biosensing and bioanalysis techniques #Azide #Biochemistry #Biotin #Catalysis #Chemistry #Click Chemistry and Applications #Click chemistry #Combinatorial chemistry #Cycloaddition #Enone #Masking (illustration) #Organic chemistry #Photochemistry #Sialic acid
paper · doi:10.1021/ja9054096
published in Journal of the American Chemical Society 131(43), 15769-15776 (American Chemical Society)
openalex publication_date 2009/10/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Phototriggering of the metal-free azide to acetylene cycloaddition reaction was achieved by masking the triple bond of dibenzocyclooctynes as cyclopropenone. Such masked cyclooctynes do not react with azides in the dark. Irradiation of cyclopropenones results in the efficient (Phi(355) = 0.33) and clean regeneration of the corresponding dibenzocyclooctynes, which then undergo facile catalyst-free cycloadditions with azides to give corresponding triazoles under ambient conditions. In situ light activation of a cyclopropenone linked to biotin made it possible to label living cells expressing glycoproteins containing N-azidoacetyl-sialic acid. The cyclopropenone-based phototriggered click chemistry offers exciting opportunities to label living organisms in a temporally and spatially controlled manner and may facilitate the preparation of microarrays.