Cu(II)-Mediated C–S/N–S Bond Formation via C–H Activation: Access to Benzoisothiazolones Using Elemental Sulfur
摘要:
A copper-mediated CS/NS bondforming reaction via CH activation that uses elemental sulfur has been developed. The addition of TBAI was found to be crucial for the success of this transformation. The method is scalable, shows excellent functional group tolerance, and is compatible with heterocycle substrates, providing efficient and practical access to benzoisothiazolones. The direct diversification of the benzoisothiazolone products into a variety of sulfur-containing compounds is also demonstrated.
Nickel-Catalyzed Sulfonylation of C(<i>sp</i><sup>2</sup>)-H Bonds with Sodium Sulfinates
作者:Shuang-Liang Liu、Xue-Hong Li、Shu-Sheng Zhang、Sheng-Kai Hou、Guang-Chao Yang、Jun-Fang Gong、Mao-Ping Song
DOI:10.1002/adsc.201700290
日期:2017.7.3
substrate scope and good functional group tolerance with high monosulfonylation selectivity. Besides arenes and heteroarenes, the reaction can also be extended to alkenes, providing diverse diaryl and alkylarylsulfones in high yields. Furthermore, a plausible Ni(I)/Ni(III) mechanism is outlined based on our experimental results and related precedents.
Cobalt-Catalyzed C(sp<sup>2</sup>)−H Methylation by using Dicumyl Peroxide as both the Methylating Reagent and Hydrogen Acceptor
作者:Qun Li、Yanrong Li、Weipeng Hu、Renjian Hu、Guigen Li、Hongjian Lu
DOI:10.1002/chem.201602445
日期:2016.8.22
The first cobalt‐catalyzed direct methylation of a C(sp2)−H bond usingdicumylperoxide (DCP) as both the methylatingreagent and hydrogenacceptor has been established. The reaction proceeded without the use of any additives, and was proven to be applicable to various amides bearing a 2‐pyridinylisopropyl (PIP) directing group, providing an efficient access to o‐methyl aryl amides with high functional‐group
Cobalt-Catalyzed Secondary Alkylation of Arenes and Olefins with Alkyl Ethers through the Cleavage of C(sp<sup>2</sup>)–H and C(sp<sup>3</sup>)–O Bonds
作者:Xunqing Dong、Qun Li、Guigen Li、Hongjian Lu
DOI:10.1021/acs.joc.8b02197
日期:2018.11.2
A novel cobalt-catalyzed C–H alkylation of arenes and olefins is achieved with (pyridin-2-yl)isopropyl amine as an N,N-bidentate directing group. Different linear, branched, and cyclic alkyl ethers were used as practical secondary alkylating reagents through cleavage of C(sp3)–O bond, providing an efficient approach to the synthesis of verstile o-alkylated arylamides and tetrasubstituted acrylamides
Cobalt-Catalyzed Cross-Dehydrogenative Coupling Reaction between Unactivated C(sp<sup>2</sup>)–H and C(sp<sup>3</sup>)–H Bonds
作者:Qun Li、Weipeng Hu、Renjian Hu、Hongjian Lu、Guigen Li
DOI:10.1021/acs.orglett.7b02316
日期:2017.9.1
Catalytic oxidative cross-dehydrogenative coupling between unactivated C(sp2)–H and C(sp3)–H bonds is achieved by the cobalt-catalyzed o-alkylation reaction of aromatic carboxamides containing (pyridin-2-yl)isopropyl amine (PIP–NH2) as a N,N-bidentate directing group. Many different C(sp3)–H bonds in alkanes, toluene derivatives and even in the α-position of ethers and thioethers can be used as coupling
Nickel-catalyzed and benzoic acid-promoted direct sulfenylation of unactivated arenes
作者:Ke Yang、Yuqi Wang、Xinyong Chen、Adnan A. Kadi、Hoong-Kun Fun、Hao Sun、Yan Zhang、Hongjian Lu
DOI:10.1039/c4cc10431e
日期:——
A nickel-catalyzed direct sulfenylation of unactivated arenes using removable 2-(pyridine-2-yl)-isopropylamine as a directing group has been developed.