The reactivity of various iodanes, such as (diacetoxyiodo)arenes, the Dess–Martin reagent, and (arylsulfonyloxy)benziodoxolones, with (o-alkyl)- and (o-phenyl)arenecarboxylic acids in the presence of iodine (Suárez system) was studied to give the corresponding lactones via oxygen-centered radicals. (Diacetoxyiodo)arenes gave the lactones in good yields, while 1-(arylsulfonyloxy)benziodoxolones gave lactones together with the iodinated lactones. The Dess–Martin reagent also showed the same reactivity as (diacetoxyiodo)arenes to give the lactones. Among them, (diacetoxyiodo)toluene showed the best reactivity for the conversion of these carboxylic acids to the corresponding lactones.
研究了各种
碘试剂,如(
二乙酰氧基
碘)
芳烃、Dess-Martin试剂和(芳磺酰氧基)苯
碘氧杂环酮,与(邻烷基)和(邻苯基)芳香
羧酸在
碘存在下(Suárez系统)的反应活性,经由氧中心自由基生成相应的内酯。(
二乙酰氧基
碘)
芳烃可以高产率地生成内酯,而1-(芳磺酰氧基)苯
碘氧杂环酮则同时生成
碘代内酯。Dess-Martin试剂与(
二乙酰氧基
碘)
芳烃显示出相同的反应活性,也能生成内酯。其中,(
二乙酰氧基
碘)
甲苯对于这些
羧酸转化为相应内酯的反应活性最佳。