4-benzoquinones exhibit nucleophilic reactivity, such that exposure to appropriate electrophiles generates products of C–H iodination, bromination, and phenylselenation. This provides a mild and general method for direct halofunctionalization, and the first method that can achieve direct C–H phenylselenation of this compound class. The scope and limitations of the new protocols are outlined, and representative
在Rh催化的条件下,典型的亲电子1,4-苯醌具有亲核反应性,因此暴露于适当的亲电子会产生CH
碘化,
溴化和苯
硒化的产物。这为直接的卤代官能化提供了一种温和而通用的方法,并且是第一个可以实现此类化合物直接C–H苯基
硒化的方法。概述了新协议的范围和局限性,并突出了代表性的衍生化。