A convenient copper-catalyzed direct amination of nitroarenes with O-alkylhydroxylamines
作者:Shinzo Seko、Kunihito Miyake、Norio Kawamura
DOI:10.1039/a901537j
日期:——
O-Alkylhydroxylamines, particularly O-methylhydroxylamine, aminate nitroarenes in the presence of a strong base and a copper catalyst to give aminonitroarenes in good yields. ortho- or para-Amination with respect to the nitro group takes place, and in some cases the ortho-aminated product is preferentially obtained. With 3-substituted nitrobenzenes where the substituent has a lone pair of electrons, preferential amination occurs at the 2-position to give the sterically most congested 3c–f, 14 and 22g.
O-烷基羟胺,尤其是O-甲基羟胺,在强碱和铜催化剂的存在下与硝基芳烃反应,生成氨基硝基芳烃,且产率良好。相对于硝基组,发生邻位或对位氨基化反应,在某些情况下,邻位氨基化产物优先获得。对于3-取代的硝基苯,其中取代基带有孤对电子,氨基化优先发生在2位,生成空间位阻最大的3c–f、14和22g。