Reactions of 3-R-5-nitropyridines with nucleophiles: Nucleophilic substitution vs conjugate addition
作者:Maxim A. Bastrakov、Vladislav V. Nikol’skiy、Alexey M. Starosotnikov、Ivan V. Fedyanin、Svyatoslav A. Shevelev、Daniil A. Knyazev
DOI:10.1016/j.tet.2019.130659
日期:2019.11
A number of 3-R-5-nitropyridines were synthesized and their reactions with various types of nucleophiles were investigated. The reaction outcome depends on the nature of a nucleophile: in case of anionic O-, N- and S-nucleophiles the previously unreported substitution of non-activated nitro group occurred while carbon nucleophiles underwent dearomatization of the pyridine ring with the formation of
合成了许多3-R-5-硝基吡啶,并研究了它们与各种类型亲核试剂的反应。反应结果取决于亲核试剂的性质:在阴离子O-,N-和S-亲核试剂的情况下,以前未报告的未活化硝基发生取代,而碳亲核试剂经历了吡啶环的脱芳香化反应,形成了1,2-和1,4-加成。