Iridium(III)-Catalyzed Direct Arylation of C–H Bonds with Diaryliodonium Salts
作者:Pan Gao、Wei Guo、Jingjing Xue、Yue Zhao、Yu Yuan、Yuanzhi Xia、Zhuangzhi Shi
DOI:10.1021/jacs.5b06758
日期:2015.9.30
arylation of complex compounds. Mechanistic studies by density functional theory calculations suggested that the sp(3) C-H activation was realized by a triflate-involved concerted metalation-deprotonation process, and the following oxidation of Ir(III) to Ir(V) is the most favorable when a bistriflimide is contained in the diaryliodonium salt. Calculations indicated that both steps are enabled by initial anion
Synthesis of biaryls via intramolecular free radical ipso-substitution reactions
作者:Feroze Ujjainwalla、Maria Lucília E.N. da Mata、Andrew M.K. Pennell、Carmen Escolano、William B. Motherwell、Santiago Vázquez
DOI:10.1016/j.tet.2015.07.048
日期:2015.9
intramolecular freeradical [1,5]-ipso-substitution using sulfonamide and sulfonate derived tethering chains. The overall efficiency of the process is determined by appropriately positioned substituents on the aromatic acceptor ring. The extension of the process to benzylic sulfonates and their corresponding N-methylsulfonamide alternatives as substrates in potential [1,6]-ipso-substitution reactions leads
A novel route to biaryls via intramolecular free radical ipso substitution reactions
作者:William B. Motherwell、Andrew M. K. Pennell
DOI:10.1039/c39910000877
日期:——
A variety of usefully functionalised biaryls may be prepared under neutral conditions by an intramolecular free radicalipsosubstitution reaction at an sp2 sulphonyl substituted carbon atom; the overall efficiency of the process being determined both by the nature and number of atoms linking the two aromatic rings and by appropriately positioned substituents on the aromatic aceeptor ring.
Cobalt-Catalyzed CH Arylations with Weakly-Coordinating Amides and Tetrazoles: Expedient Route to Angiotensin-II-Receptor Blockers
作者:Jie Li、Lutz Ackermann
DOI:10.1002/chem.201500552
日期:2015.4.7
Cobalt‐catalyzed CH arylations enabled the synthesis of biaryl tetrazoles, which are key structural motifs in antihypertensive angiotensin‐II‐receptor blockers. Thus, weakly‐coordinating benzamides were employed for step‐economical CH arylations with ample scope. Further, a low‐valent NHC complex enabled first cobalt‐catalyzed CH functionalization by tetrazole assistance.
Improved Palladium Catalysis in Suzuki‐Type Coupling of Benzotriazinones for o‐Aryl/Alkenyl Benzamides
作者:Minling Xü、Ke Xü、Gang Zou
DOI:10.1002/adsc.202400276
日期:2024.6.10
A palladium catalyst system based on PdCl2(PPh3)2 or PdCl2(dppf) is reported for Suzuki-typecoupling of both N-aryl and alkyl benzotriazinones with aryl/alkenyl boronic acids to afford a series of ortho-aryl/alkenyl benzamides in yields up to 99%, showing improvements on catalytic efficiency, substrate scope and practicality. Scope and limitations of the improved protocol have been demonstrated with