Iridium(III)-Catalyzed Direct Arylation of C–H Bonds with Diaryliodonium Salts
作者:Pan Gao、Wei Guo、Jingjing Xue、Yue Zhao、Yu Yuan、Yuanzhi Xia、Zhuangzhi Shi
DOI:10.1021/jacs.5b06758
日期:2015.9.30
arylation of complex compounds. Mechanistic studies by density functional theory calculations suggested that the sp(3) C-H activation was realized by a triflate-involved concerted metalation-deprotonation process, and the following oxidation of Ir(III) to Ir(V) is the most favorable when a bistriflimide is contained in the diaryliodonium salt. Calculations indicated that both steps are enabled by initial anion
Directingstrategy has been extensively exploited to maintain activity and selectivity for the rapid access to functionalized molecules and pharmaceutical targets. However, ‘one‐to‐one’ activation model was usually achieved through traditional directingstrategy. Herein, we achieved ‘one‐to‐two’ activation model by slight modification of simple and practical ketoxime and amide functionality. With judicious
Palladium-catalyzed arene C(sp2)–H acetoxylation has emerged as a powerful tool to construct a carbon–oxygen (C–O) bond. However, the requirement of stoichiometric chemical oxidants for this transformation possesses a significant disadvantage. To solve this fundamental problem, we now report an anodic oxidation strategy to achieve arene C(sp2)–H acetoxylation.
Compounds of formula (I) wherein R1 is C1-C4alkyl or C1-C4haloalkyl; R2 is C1-C4alkyl; R3 is hydrogen or halogen; R4 is hydrogen, C1-C4alkyl or C1-C4haloalkyl; R5 is hydrogen, halogen, C1-C4alkyl or C1-C4haloalkyl; G1 is a cyclohexenyl group which is mono- or polysubstituted by substituents selected from the group consisting of C1-C6alkyl, C1-C6alkoxy, C3-C6cycloalkyl and phenyl; said cyclohexenyl group can form together with a C1-C4alkylene group a bicyclic system which can be mono- or polysubstituted by by substituents selected from the group consisting of C1-C6alkyl, C1-C6alkoxy, C3-C6cycloalkyl and phenyl; are suitable for use as microbiocides.
A fast and site-selective biaryl synthesis via dehydrogenative C–H/C–H arylation in a ball mill was developed. In this paper, both electron-deficient oximes and electron-rich anilides quickly and under mild conditions provided arylation with various arenes to give the biaryl products in high-level selectivity. Given the solventless mechanochemical conditions, the transformation obviated the use of