1,2-Addition of Alkyl Grignard Reagents to the Nitro Group: Simple Access to 2-[Alkyl(hydroxy)amino]pyridine<i>N</i>-Oxides and 2-Alkylaminopyridine<i>N</i>-Oxides
作者:Kun-Ming Liu、Fang Zhang、Xin-Fang Duan
DOI:10.1002/ejoc.201300801
日期:2013.9
The unexpected 1,2-addition of various alkyl Grignard reagents to nitro groups is described. A simple treatment of a 2-nitropyridine N-oxide with an alkyl Grignard reagent results in a 2-[alkyl(hydroxy)amino]pyridine N-oxide as the result of a 1,2-addition to the nitro group. Moreover, 2-(alkylamino)pyridine N-oxides can also be obtained from this 1,2-addition after a reductive workup by using NaBH4/FeCl3
描述了各种烷基格利雅试剂出人意料的 1,2-加成反应到硝基上。用烷基格利雅试剂对 2-硝基吡啶 N-氧化物进行简单处理,产生 2-[烷基(羟基)氨基]吡啶 N-氧化物,这是硝基 1,2-加成的结果。此外,在使用 NaBH4/FeCl3 进行还原后处理后,2-(烷基氨基)吡啶 N-氧化物也可以从该 1,2-加成获得。这项工作展示了烷基格氏试剂与硝基反应的另一个方面,并提供了一种无需过渡金属催化剂即可形成碳氮键的简单方法。