An improved procedure for the nitration of benzo-2,1,3-selenadiazoles and their reduction to<i>ortho</i>-phenylenediamines
作者:S. W. Wright、L. D. Mcclure
DOI:10.1002/jhet.5570410629
日期:2004.11
for the nitration of benzo-2,1,3-selenadiazoles using nitric acid dissolved in a mixture of methanesulfonic acid and phosphorus pentoxide at room temperature is presented. The SN2Ar displacement of fluoride that is observed when sulfuric acid is used as solvent is prevented and yields are high. Sodium nitrate could be used in place of nitric acid with no loss in yield. Following nitration, the 2,1
提出了一种在室温下使用溶于甲磺酸和五氧化二磷混合物中的硝酸硝化苯并-2,1,3-硒代二唑的方法。当使用硫酸作为溶剂时观察到的氟化物的S N 2Ar置换得到防止,并且产率高。可以使用硝酸钠代替硝酸,而不会损失产率。硝化后,将2,1,3-硒代二唑环用氢碘酸裂解,得到3-硝基-邻-苯二胺。该方法适用于4-氟-3-硝基苯-1,2-二胺的多克制备。