Equivalent Loading of Directed Arenes in Pd(II)-Catalyzed Oxidative Cross-Coupling of Aryl C–H Bonds at Room Temperature
作者:Chong Mei、Mengdi Zhao、Wenjun Lu
DOI:10.1021/acs.joc.0c02722
日期:2021.2.5
cross-couplings of aryl halides (Ar1–halo) with aryl metallics (Ar2–M) in the loading ratio of 1:1 are popular in chemical synthesis. In contrast, there has been less precedence on the same biaryls produced effectively from two normal aryl C–H bonds with equivalent loading. Here, we report that, in a palladium/oxidant/acid catalytic system at room temperature, one arene (Ar1–H, 1 equiv) can highly selectively
在化学合成中,由芳基卤化物(Ar 1 -halo)与芳族金属(Ar 2 -M)催化交联产生的不对称联芳基(Ar 1 -Ar 2)在化学合成中很普遍。相比之下,由两个正常的芳基C–H键有效地产生的相同联芳基具有相同的负载量,则优先级较低。在这里,我们在室温下,一个芳烃报告说,在钯/氧化剂/酸催化体系(AR 1为-H,1个当量)可高选择性地夫妇与其他一个(AR 2为-H,1当量),得到目标Ar 1 –Ar 2仅通过控制其苯环上的导向基团和取代基即可。几个生物活性分子的合成也证明了这种一对一交叉偶联的效用。