1,3-Dipolar cycloaddition between acetylenic dipolarophiles and sydnone-N-ylides as bis(1,3-dipoles)
作者:Florin Albota、Constantin Drăghici、Mino R. Caira、Florea Dumitrascu
DOI:10.1016/j.tet.2015.10.021
日期:2015.12
1,3-Dipolar cycloaddition reaction of sydnone-N-ylides, as model bis(1,3-dipoles), with acetylenic dipolarophiles in 1,2-epoxybutane under reflux gave exclusively pyrroloazines containing a sydnone moiety that resulted by preferred reaction of the N-ylide 1,3-dipole with the acetylenic dipolarophiles. The assembled sydnone-ylide hybrid structures were generated in situ from N-heteroaromatic bromides
sydnone- N- ylides(作为双(1,3-dipoles)模型)与炔属双极性亲和剂在1,2-环氧丁烷中回流下的1,3-偶极环加成反应,仅得到含有sydnone部分的吡咯并嗪,这是由于优选N -ylide 1,3-dipole与炔属双极性亲核试剂。组装的sydnone-ylide杂化结构是由N-杂芳族溴化物原位生成的。通过IR和NMR光谱确定新化合物的结构,并通过X射线分析对代表性化合物进行确认。