Tricyanovinylation of 2-aryl-1-vinylpyrroles: solvent- and substituent controlled chemo- and regioselectivity
作者:Boris A. Trofimov、Lyubov' N. Sobenina、Vladislav N. Drichkov、Igor' A. Ushakov、Al'bina I. Mikhaleva
DOI:10.1016/j.tet.2009.03.094
日期:2009.5
in 88–94% yield. The latter, upon recrystallization from EtOH, eliminates HCN and entirely rearranges to afford stereospecifically trans-(3E)-4-(2-arylpyrrol-1-yl)-1,3-butadiene-1,1,2-tricarbonitriles. In DMSO, along with the above [2+2]-cycloaddition, tricyanovinylation of the pyrrole ring occurs to form the corresponding 3- and 5-tricyanovinylpyrroles, the product ratio being dependent on the substituents
丙酮,THF和苯中的2-芳基-1-乙烯基吡咯与四氰基乙烯在整个乙烯基上发生化学和区域专一性反应,生成88-中的3-(2-芳基吡咯-1-基)-1,1,2,2-环丁烷四腈产率94%。后者在从EtOH中重结晶后,消除了HCN,并完全重排以提供立体有择的反式-(3E)-4-(2-芳基吡咯-1-基)-1,3-丁二烯-1,1,2-三腈。在DMSO中,连同上述[2 + 2]-环加成反应,吡咯环的三氰基乙烯基化反应形成相应的3-和5-三氰基乙烯基吡咯,产物比例取决于吡咯环中的取代基和反应条件。