Rhodium-Catalyzed CS and CN Functionalization of Arenes: Combination of CH Activation and Hypervalent Iodine Chemistry
作者:Fen Wang、Xinzhang Yu、Zisong Qi、Xingwei Li
DOI:10.1002/chem.201504179
日期:2016.1.11
Rhodium‐catalyzed sulfonylation, thioetherification, thiocyanation, and other heterofunctionalizations of arenes bearing a heterocyclic directing group have been realized. The reaction proceeds by initial RhIII‐catalyzed CH hyperiodination of arene at room temperature followed by uncatalyzed nucleophilic functionalization. A diaryliodonium salt is isolated as an intermediate, which represents umpolung
A catalytic variant of the directthiolation of arenes, bearing directing groups, with disulfides or thiols has been developed under palladium and copper co‐catalysis. Both sulfenyl moieties of the disulfide could be incorporated into the thiolated products, therefore, the reactions reached completion with only half an equivalent of disulfide, with respect to the starting arene. Experimental evidence
在钯和铜的共催化下,开发了带有二价硫或硫醇的带有导向基团的芳烃直接硫醇化的催化变体。二硫化物的两个亚硫基部分都可以结合到硫醇化产物中,因此,相对于起始芳烃,仅用一半当量的二硫化物就可以完成反应。实验证据表明该反应是通过Pd II / Pd IV机制进行的。
Rhodium-Catalyzed Directed Sulfenylation of Arene CH Bonds
作者:Yaxi Yang、Wei Hou、Lihuai Qin、Juanjuan Du、Huijin Feng、Bing Zhou、Yuanchao Li
DOI:10.1002/chem.201303730
日期:2014.1.7
The rhodium‐catalyzed intermolecular directCH thiolation of arenes with aryl and alkyl disulfides was developed for the first time to provide a convenient route to aryl thioethers. This strategy is compatible with many different directing groups and exhibits excellent functional group tolerance. More significantly, mono‐ or dithiolation can be selectively achieved, thus providing a straightforward
Palladium-catalyzed C–H thiolation of aryl 2-pyridyl sulfoxide with diaryl disulfides has been achieved. The reaction proceeds selectively at the ortho-position of masked thiophenol. The directing group 2-pyridyl sulfoxide can be further converted to various sulfur functionalities through conventional reduction/oxidation processes. Kinetic isotopic studies and radical quenching experiments were performed
Palladium catalyzes the intermolecular chalcogenation of carbazole, 2-phenylpyridine, benzo[h]quinolone, and indole derivatives with disulfides and diselenides via selective C-H bond cleavage, providing a convenient route to thio and selenoethers.