A mild and efficient electron-transfer method was developed for the chemoselective reduction of aromatic nitro groups using samarium(0) metal in the presence of a catalytic amount of 1,1'-dioctyl-4,4'-bipyridinium dibromide. This method was found to give the product aromatic amine in 79-99% yield with selectivity over a number of other functional and protecting groups such as alkene, azide, benzyl
在催化量的1,1'-二辛基-
4,4'-联吡啶二
溴化物存在下,开发了一种温和有效的电子转移方法,用于使用sa(0)
金属
化学选择性还原芳香族硝基。发现该方法以79-99%的收率提供了产物芳香胺,对许多其他官能团和保护基团(例如烯烃,
叠氮化物,苄基醚,腈,酰胺,卤化物,对
甲苯磺酰胺,t-Boc,叔丁基二苯基甲
硅烷基醚和脂肪族硝基。我们的结果还表明sa(0)在还原过程中起着重要作用,而1,1'-二辛基-4,4'-联
溴化二
溴化物充当电子转移催化剂,并且在激活((0 )
金属。