Synthesis of pyrrolidin-2-ylidenes and pyrrol-2-ylidenes <i>via</i> 1,3-dipolar cycloaddition of H-bond-assisted azomethine ylides to nitrostyrenes
作者:Issa Yavari、Ramin Mohsenzadeh、Parisa Ravaghi、Maryam Safaei
DOI:10.1039/d3ob00725a
日期:——
ylidene)acetonitriles, undergo a formal Huisgen 1,3-dipolar cycloaddition with β-bromo-β-nitrostyrenes to afford a diastereoselective synthesis of highly substituted pyrrolidin-2-ylidene derivatives. When β-nitrostyrenes were used as the alkene component, 2-(4,5-diaryl-1,5-dihydro-2H-pyrrol-2-ylidene)-1H-indene-1,3(2H)-diones were obtained. Efficient conversion of pyrrolidene-2-ylidenes to the corresponding
氢键辅助的偶氮甲碱叶立德,由 2-(苄氨基)-2-(1,3-二氧代-1,3-二氢-2 H-茚-2-亚基)乙腈生成,经过正式的 Huisgen 1,3-与 β-溴-β-硝基苯乙烯的偶极环加成反应非对映选择性合成高度取代的吡咯烷-2-亚基衍生物。当使用β-硝基苯乙烯作为烯烃组分时,2-(4,5-二芳基-1,5-二氢-2H-吡咯-2-亚基)-1H-茚-1,3(2H ) -二酮获得。在过量 Et 3 N存在下,在回流 1-丙醇中,吡咯烷-2-亚基有效转化为相应的吡咯-2-亚基。此外,通过 X 射线测定了吡咯烷-2-亚基衍生物的结构晶体学。