Palladium-Catalysed Intramolecular Direct Arylation of 2-Bromobenzenesulfonic Acid Derivatives
作者:Charles Beromeo Bheeter、Jitendra K. Bera、Henri Doucet
DOI:10.1002/adsc.201200793
日期:2012.12.14
arylation of 2-bromobenzenesulfonic acid derivatives was found to proceed using 1 mol% of palladiumacetate as the catalyst. The influence of the substituents on the phenol moiety of 2-bromobenzenesulfonic acid phenyl esters reveals that electron-donating substituents favour the reaction while electron-withdrawing ones are unfavourable. The reactivity of sulfonamides was also studied and, in all cases
Nickel-Catalyzed Denitrogenative Cyclization of 1,2,3,4-Benzothiatriazin-1,1(2<i>H</i>)-dioxides with Arynes To Synthesize Biaryl Sultams
作者:Vijaykumar H. Thorat、Yu-Lin Tsai、Yong-Ran Huang、Chien-Hong Cheng、Jen-Chieh Hsieh
DOI:10.1021/acs.orglett.2c00920
日期:2022.4.22
Herein, we report the nickel-catalyzed denitrogenative cyclization reaction of 1,2,3,4-benzothiatriazine-1,1-dioxides with arynes to generate the polysubstituted biaryl sultams with tolerance of a wide diversity of substituents on every subunit. The mechanistic study indicates that the reaction is initiated by the formation of a diradical species, which reacts with a nickel complex to form a nickelacycle
Synthesis of carbazoles and dibenzofurans via cross-coupling of o-iodoanilines and o-iodophenols with silylaryl triflates and subsequent Pd-catalyzed cyclization
作者:Zhijian Liu、Richard C. Larock
DOI:10.1016/j.tet.2006.10.071
日期:2007.1
An efficient route to a variety of carbazoles and dibenzofurans has been developed. It involves the reaction of o-iodoanilines or o-iodophenols with silylaryl triflates in the presence of CsF to afford the N- or O-arylated products, which are subsequently cyclized using a Pd catalyst to carbazoles and dibenzofurans in good to excellent yields. By using this methodology, the carbazole alkaloid, mukonine has been synthesized in 76% overall yield in three steps. (c) 2006 Elsevier Ltd. All rights reserved.
Huppatz,J.L.; Sasse,W.H.F., Australian Journal of Chemistry, 1963, vol. 16, p. 417 - 431