Substitution of the Nitro Group with Grignard Reagents: Facile Arylation and Alkenylation of Pyridine <i>N</i>-Oxides
作者:Fang Zhang、Song Zhang、Xin-Fang Duan
DOI:10.1021/ol3026632
日期:2012.11.2
unprecedented substitution of a nitro group with aryl or alkenyl groups of Grignard reagents affords 2-aryl or alkenylpyridine N-oxides in modest to high yields with high chemoselectivity. This protocol allows a simple and clean synthesis of various 2-substituted pyridineN-oxides and the corresponding pyridine derivatives. Furthermore, straightforward one-pot iterative functionality of pyridineN-oxides could
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 Grignardreagents to nitro groups is described. A simple treatment of a 2-nitropyridine N-oxide with an alkyl Grignardreagent 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