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.
A palladium-catalyzed chelation-assisted C–H olefination of 2-amino biaryls using readily available vinylsilanes as unactivated alkenes was developed to afford valuable arylated vinylsilanes with exclusive (E)-selectivities.
Aryl radical-induced desulfonylative<i>ipso</i>-substitution of diaryliodonium salts: an efficient route to sterically hindered biarylamines
作者:Huangguan Chen、Limin Wang、Jianwei Han
DOI:10.1039/d0cc01766c
日期:——
By using vicinal aryl sulfonamide substituted diaryliodonium salts, a cascade of desulfonylation/aryl migration was promoted by triethylamine in the synthesis of sterically hindered biarylamines, which operated via a radical-induced reaction pathway. The products were readily converted into a variety of important synthons. Furthermore, coupling reactions of N-methyl biarylamine and 1,6-dibromopyrene
A broadly applicable rhodium-catalyzed direct ortho-arylation of anilines with (hetero)aryl halides based on readily available aminophosphines as traceless directing groups is reported. The ortho-arylated anilines could be obtained in high yields, without any competing diarylation and with full regioselectivity. The catalytic cycle was elucidated by DFT and supporting experiments.