Intramolecular homolytic aromatic substitution of alkyl 2-benzimidazolyl sulfones as a means of entry into alkyl radicals for organic synthesis
作者:David Crich、Daniel Grant
DOI:10.1016/j.tetlet.2008.02.174
日期:2008.4
radical aromatic substitution of heteroaryl sulfones by tethered aryl radicals has been investigated as a source of alkyl radicals. The 1-(2-iodobenzyl)benzimidazole-2-sulfonyl system was found to be the most effective, while a tetrazole-based system did not undergo the desired radical aromatic substitution at all. Application of the benzimidazole-based system to the generation of alkyl radical and their
Aromatic homolytic substitution using solid phase synthesis
作者:Steven M. Allin、W. Russell Bowman、Rehana Karim、Shahzad S. Rahman
DOI:10.1016/j.tet.2006.02.071
日期:2006.5
Solid phase synthesis has been used to carry out intramolecular aromatichomolyticsubstitution with benzoimidazole precursors. The protocol attaches the radical precursors to the resins via the radical leaving groups (in the aromatichomolyticsubstitution). When the radical reactions are complete, the leaving group, unaltered starting material and reduced uncylised products remain attached to the