Unexpected Heterocyclization of Electrophilic Alkenes by Tetranitromethane in the Presence of Triethylamine. Synthesis of 3-Nitroisoxazoles
作者:Yulia A. Volkova、Elena B. Averina、Yuri K. Grishin、Per Bruheim、Tamara S. Kuznetsova、Nikolai S. Zefirov
DOI:10.1021/jo100319p
日期:2010.5.7
electrophilic alkenes in the presence of triethylamine yielding substituted 3-nitroisoxazoles was found and studied. Triethylamine increases the reactivity of TNM toward electrophilic alkenes promoting their heterocyclization, and the reactions proceed in an unusual way. A variety of α,β-unsaturated aldehydes, ketones, esters, amides, phosphonates, and nitro and sulfur compounds was involved in the heterocyclization
发现并研究了在三乙胺存在下四硝基甲烷(TNM)与亲电烯烃的新型反应,生成取代的3-硝基异恶唑。三乙胺增加了TNM对亲电烯烃的反应性,从而促进了它们的杂环化,并且反应以不寻常的方式进行。各种α,β-不饱和醛,酮,酯,酰胺,膦酸酯以及硝基和硫化合物都参与了杂环化反应,并以良好或高收率获得了多种官能化的3-硝基异恶唑。讨论了反应的范围和局限性以及机理。