Origins of halogen effects in bioorthogonal sydnone cycloadditions. 2018

Huimin Tao, and Fang Liu, and Ruxin Zeng, and Zhuzhou Shao, and Lufeng Zou, and Yang Cao, and Jennifer M Murphy, and K N Houk, and Yong Liang
State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China. yongliang@nju.edu.cn.

Halogen substituents increase sydnone cycloaddition reactivities substantially. Fluoro-sydnones are superior to bromo- and chloro-sydnones, and can achieve extremely high second-order rate constants with strained alkynes. Computational studies have revealed the fluorine substituent increases the reactivity of sydnone mainly by lowering its distortion energy.

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