Facile One-Pot Direct Arylation and Alkylation of Nitropyridine <i>N</i>-Oxides with Grignard Reagents
作者:Fang Zhang、Xin-Fang Duan
DOI:10.1021/ol202597b
日期:2011.11.18
Facile arylation and alkylation of nitropyridine N-oxides were developed through the reactions of Grignard reagents with nitropyridine N-oxides. For the same 4-nitropyridine N-oxide, arylation occurred at the 2- (or 6-) position, whereas alkylation occurred at the 3-position in an adjustably site-selective manner. The cooperative action of the two groups was discovered in the reactions of 3-nitropyridine
通过格氏试剂与硝基吡啶N-氧化物的反应,开发了硝基吡啶N-氧化物的简便芳基化和烷基化反应。对于相同的4-硝基吡啶N-氧化物,芳基化发生在2-(或6-)位,而烷基化发生在3-位以可调节的位点选择性方式发生。在3-硝基吡啶N-氧化物的反应中发现了两组的协同作用。该方案可广泛用于构建各种吡啶化合物,如Emoxipin和Caerulomycin A和E的总合成所示。