A simple method was developed for selective para-cyanation of alkoxy- and benzyloxy-substituted benzenes with 0.5 equivalents of potassium ferricyanide, 0.8 equivalants of copper(II) nitrate and 0.5 equivalents of iodine in acetonitrile. Among various phenyl carbon-hydrogen bonds, those at the para-position with regard to the alkoxy or benzyloxy groups were selectively cyanated in 20% to 87% yields
一个简单的方法,用于选择性地开发对用0.5当量的
铁氰化钾,
硝酸铜0.8 equivalants和在
乙腈中的0.5当量的
碘的烷氧基和苄氧基-取代的苯的-cyanation。在各种苯基碳氢键中,相对于烷氧基或苄氧基处于对位的那些被选择性
氰化,产率为20%至87%(23个例子)。本方法使用可商购的试剂,并且可以以十克规模进行。有趣的是,在不存在
铁氰化钾的情况下,
甲氧基苯以32%的产率
氰化,这表明一部分产品的腈基可能来自溶剂
乙腈。