Remarkable Switch in the Regiochemistry of the Iodination of Anilines by N-Iodosuccinimide: Synthesis of 1,2-Dichloro-3,4-diiodobenzene
作者:K. Vollhardt、Hao Shen
DOI:10.1055/s-0031-1290118
日期:2012.1
Direct iodination of anilines by NIS in polar solvents (such as DMSO) affords p-iodinated products with up to >99% regioselectivity. Switching to less polar solvents (such as benzene) in the presence of AcOH inverts this outcome toward dramatically increased or preferential generation of the o-isomers, also with up to >99% regioselectivity. This finding was exploited in the synthesis of 1,2-dichloro-3
通过NIS在极性溶剂(例如DMSO)中直接对苯胺进行碘化,可得到对碘化的产品,其区域选择性高达> 99%。在AcOH存在下改用极性较小的溶剂(例如苯)会使该结果转向邻位异构体的急剧增加或优先生成,区域选择性也高达> 99%。该发现被用于合成1,2-二氯-3,4-二碘苯。 芳香胺-亲电取代-卤化-区域选择性-溶剂效应