The title compounds, 2-aryl-3-iodo-4H-1-benzopyrans and 2-alkyl-or 2-aryl-3-iodo-4H-1-benzothiopyrans, were prepared by reaction of the corresponding heterocyclic derivatives with the iodine-cerium(IV) ammonium nitrate system under mild conditions. The scope and proposed mechanism of the reaction were also demonstrated.
在温和的条件下,相应的杂环衍
生物与
碘-
铈(IV)
硝酸铵体系发生反应,制备出了标题化合物--2-芳基-3-
碘-4H-1-苯并
吡喃和 2-烷基-或 2-芳基-3-
碘-4H-1-苯并
硫代
吡喃。此外,还展示了该反应的范围和拟议机理。