OXIDATIVE CYCLIZATION OF 5-ARYL-1-BENZYL-1,2,3-TRIAZOLES BEARING ELECTRON-RICH AROMATIC GROUPS: <i>ortho</i>/<i>ortho</i> AND <i>ortho</i>/<i>ipso</i> COUPLING
DOI:
https://doi.org/10.1007/6318Ключевые слова:
9H-dibenzo[c, e][1, 2, 3]triazolo[1, 5-a]azepines, 3, 3-disubstituted indoles, quinonoid compounds, 1, 3-triazoles, intramolecular oxidative aryl–aryl coupling, ipso attackАннотация
The intramolecular oxidative coupling of electron-rich aromatic groups in 5-(het)aryl-1-(het)arylalkyl-1H-1,2,3-triazoles was studied in detail. Under treatment with phenyliodoso bis(trifluoroacetate) and boron trifluoride etherate these substrates afforded products of either ortho/ortho or ortho/ipso coupling depending on the nature of aromatic groups and reaction conditions applied. It was found that for substrates which are capable for both types of coupling, ortho-/ipso-adducts are formed under kinetic control while ortho-/ortho-products are formed under thermodynamic control. The developed procedures allow preparation of complex polycyclic azaheterocycles from simple precursors in two steps only.