Photochemical intramolecular aromatic substitutions of the imidazol-2-yl radical are superior to those mediated by Bu<sub>3</sub>SnH
作者:Mairéad A. Clyne、Fawaz Aldabbagh
DOI:10.1039/b512729g
日期:——
Six-membered photochemical cyclisations of 2-iodo-N-(2-arylethyl)imidazoles proceeded regioselectively in higher yields than the equivalent tin hydride-mediated reactions. The decrease in yield of cyclisation products, 5,6-dihydroimidazo[2,1-a]isoquinolines containing strongly deactivating substituents on the aryl ring confirmed the electrophilic nature of the sigma-imidazol-2-yl radicals. The seven-membered