Intramolecular cascade radical cyclizations promoted by samarium diiodide
作者:Zhang Hu、Si-dong Li、Peng-zhi Hong
DOI:10.3998/ark.5550190.0011.916
日期:——
Samariumdiiodidepromotesintramolecularcascaderadicalcyclizations of cyanamide radical precursors conveniently to afford polycyclic N-heterocycles in moderate to good yields.
Employing a CuI/2,2'-biimidazole catalyst system, the intramolecularC-Ncouplingreactions of various substituted aryl guanidines could be successfully carried out under mild conditions. A variety of 1-cyanobenzimidazoles were synthesized in good to excellent yields.