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 pyridine N-oxides and the corresponding pyridine derivatives. Furthermore, straightforward one-pot iterative functionality of pyridine N-oxides could
用格氏试剂的芳基或烯基对硝基进行空前的取代,以适度至高收率的高化学选择性提供了2-芳基或烯基吡啶的N-氧化物。该方案允许简单且清洁地合成各种2-取代的吡啶N-氧化物和相应的吡啶衍生物。此外,还可以简单地通过连续应用两种格氏试剂来实现吡啶N-氧化物的直接一锅法迭代功能。