cycloadditions between 3-oxidopyridiniums and the common bioorthogonal reagent dibenzocyclooctyne (DIBO) are kinetically tuned by substitution at the 5 position, where a linear Hammett relationship is seen to favour electron donating groups. Second-order rate constants on the order of 1 M−1 s−1 have been achieved in acetonitrile at room temperature.
3-氧化
吡啶鎓和常见的
生物正交试剂二苯并
环辛炔 (DIBO) 之间的 [3+2] 环加成通过 5 位取代进行动力学调节,其中线性哈米特关系被认为有利于给电子基团。室温下
乙腈中已达到 1 M -1 s -1量级的二阶速率常数。