An efficient copper-mediated etherification of inert C–H bonds of (hetero)arenes with reagent-amounts of alkoxysilanes and alkanols has been developed using (2-aminophenyl)pyrazole (2-APP) as a removabledirectinggroup. The reaction is scalable, rapidly proceeds under an open atmosphere, and tolerates diverse functional groups to provide alkyl aryl ethers in high yields (up to 87%). As an application
copper salt, accommodates a wide range of substrates with exquisite chemo‐ and regioselectivity profile, and produces demanding polyfluorinated phenanthridinones in high yields (up to 92 %). Using alkenyl amides under identical conditions, the synthesis of polyfluorinated 2‐quinolones has also been accomplished. Given the importance of fluorinated heterocycles in the pharmaceutical industry and drug
Copper(II)-Mediated <i>ortho</i>-Selective C(sp<sup>2</sup>)–H Tandem Alkynylation/Annulation and <i>ortho</i>-Hydroxylation of Anilides with 2-Aminophenyl-1<i>H</i>-pyrazole as a Directing Group
作者:Wan-Chen Cindy Lee、Wei Wang、Jie Jack Li
DOI:10.1021/acs.joc.7b02893
日期:2018.2.16
been identified as a viable directing group to promotecopper(II)-mediated ortho-selective sp2 C–H bond tandem alkynylation/annulation of anilides with terminalalkynes to offer arylmethylene isoindolinones. Meanwhile, copper(II)-mediated ortho-selective sp2 C–H hydroxylation of anilides has also been optimized as the major reaction pathway by using Cu(OAc)2 as the promoter and 1,1,3,3-tetramethylguanidine
Ir(<scp>iii</scp>)/Ag(<scp>i</scp>)-catalyzed directly C–H amidation of arenes with OH-free hydroxyamides as amidating agents
作者:Youpeng Zuo、Meijun Liu、Jun Du、Tianren Zhang、Xiaoqing Wang、Cong Wang
DOI:10.1039/d4ra00517a
日期:——
A versatile Ir(III)-catalyzed C–H amidation of arenes by employing readily available and stable OH-free hydroxyamides as a novel amidation source. The reaction occurred with high efficiency and tolerance of a range of functional groups. A wide scope of aryl OH-free hydroxyzamides, including conjugated and challenging non-conjugated OH-free hydroxyzamides, were capable of this transformation and no
Palladium-Catalyzed Direct C(sp<sup>2</sup>)–H<i>ortho-</i>Arylation of Anilides Using 2-Aminophenylpyrazole as the Directing Group
作者:Yuning Shen、Wan-Chen Cindy Lee、David A. Gutierrez、Jie Jack Li
DOI:10.1021/acs.joc.7b01883
日期:2017.11.3
Palladium-catalyzed ortho-arylation of anilides was achieved using 2-aminophenyl-1H-pyrazole (2-APP) as a new directing group. Using Pd(OAc)(2) as the catalyst and AgO as the promoter, mono- and diarylation of anilides were realized in up to 89% isolated yield. Further manipulation of the arylation product may be accomplished by a 2-step sequence involving an acidic hydrolysis of the methylated amide. More interestingly, in the presence of K2CO3, tandem C-C/C-N cyclization products were obtained for a couple of substrates.