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An unprecedented intramolecular [4 + 2] tetrazine-olefin cycloaddition with α,β-unsaturated substrates was discovered. The reaction produces unique coumarin-dihydropyridazine heterocycles that exhibited strong fluorescence with large Stokes shifts and excellent photo- and pH-stability. This property can be used for reaction analysis. The rate of cycloaddition was found to be solvent dependent and was determined using experimental data with a kinetic modeling software (COPASI) as well as DFT calculations ( k 1 = 0.64 ± 0.019 s −1 and 4.1 s −1 , respectively). The effects of steric and electronic properties of both the tetrazine and α,β-unsaturated carbonyl on the reaction were studied and followed the known trends characteristic of the intermolecular reaction. Based on these results, we developed a “release-then-click” strategy for the ROS triggered release of methylselenenic acid (MeSeOH) and a fluorescent tracer. This strategy was demonstrated in HeLa cells via fluorescence imaging.more » « less
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Wang, Yingying ; Ni, Xiang ; Chadha, Rahuljeet ; McCartney, Caitlin ; Lam, Yannie ; Brummett, Brock ; Ramush, Geat ; Xian, Ming ( , Antioxidants & Redox Signaling)