Iodine-catalyzed synthesis of <i>N</i>,<i>N</i>′-diaryl-<i>o</i>-phenylenediamines from cyclohexanones and anilines using DMSO and O<sub>2</sub> as oxidants
作者:Mingteng Xiong、Zhan Gao、Xiao Liang、Pengfei Cai、Heping Zhu、Yuanjiang Pan
DOI:10.1039/c8cc05320k
日期:——
A novel I2-catalyzed cross-dehydrogenative aromatization of cyclohexanones and anilines to synthesize N,N′-diaryl-o-phenylenediamines has been unprecedentedly developed with dimethyl sulfoxide and oxygen employed as mild terminal oxidants. To prove the rationality of the two separate dehydration steps of the proposed mechanism, a resulting I2-catalyzed cross-dehydrogenative aromatization of cyclohexenones
Diverse multisubstituted ortho-silylaryl triflates were efficiently synthesized from simple ortho-silylaryl triflates via iridium-catalyzed regioselective C–H borylation and subsequent deborylative functionalizations. An azidoaryne precursor synthesized by this method served as a useful bis-reactive platform molecule, thus demonstrating the utility of the method for preparing diverse aromatic compounds.
Arene Trifunctionalization with Highly Fused Ring Systems through a Domino Aryne Nucleophilic and Diels–Alder Cascade
作者:Jia He、Zizi Jia、Hongcheng Tan、Xiaohua Luo、Dachuan Qiu、Jiarong Shi、Hai Xu、Yang Li
DOI:10.1002/anie.201911730
日期:2019.12.16
A convenient and efficient domino aryne process was developed under transition-metal-free conditions to generate a range of tetra- and pentacyclic ring systems. This transformation was realized via a 1,2-benzdiyne through a nucleophilic and Diels-Alder reaction cascade using styrene as the diene moiety. Three new chemical bonds, namely one C-N and two C-C bonds, and two benzofused rings could be constructed
Transition-Metal-Free Thioamination of Arynes Using Sulfenamides
作者:Rahul N. Gaykar、Subrata Bhattacharjee、Akkattu T. Biju
DOI:10.1021/acs.orglett.8b03966
日期:2019.2.1
The insertion of arynes into the S–N σ-bond of sulfenamides allowing the synthesis of o-sulfanylaniline derivatives with reasonable functional group compatibility is presented. The aryne generated from 2-(trimethylsilyl)aryl triflates using CsF in DME was the key for the success of this transition-metal-free thioamination reaction, which involves new C–N and C–S bond formations in a single step under
A novel four-component coupling reaction of carbon dioxide, amines, cyclic ethers and 3-triflyloxybenzynes has been developed for the first time, providing an efficient method for the synthesis of a series of functionalized carbamate derivatives in moderate to high yields. The process proceeds under mild, transition metal-free and fluoride-free conditions, leading to the formation of two new C–O bonds