Intermolecular ‘oxidative’ aromatic substitution reactions of the imidazol-5-yl radical mediated by the ‘reductant’ Bu3SnH
作者:Padraig T.F. McLoughlin、Mairéad A. Clyne、Fawaz Aldabbagh
DOI:10.1016/j.tet.2004.06.120
日期:2004.9
The reactivity of the imidazol-5-yl in comparison to the imidazol-2-yl and phenyl radical under the reductive conditions of Bu3SnH, in intermolecular substitution reactions onto various aromatic substrates is reported. The directing effect of the hetero atom or methyl substituent in aromatic substrates was found to be more important than the polarity of the attacking σ-radical in determining the major
据报道在Bu 3 SnH的还原条件下,在各种芳族底物上的分子间取代反应中,咪唑-5-基与咪唑-2-基和苯基的反应性。发现在确定主要产物异构体时,杂原子或甲基取代基在芳族底物中的导向作用比进攻性σ-自由基的极性更重要。