Silver-Catalyzed Cascade Reaction of β-Enaminones and Isocyanoacetates To Construct Functionalized Pyrroles
作者:Guichun Fang、Jianquan Liu、Junkai Fu、Qun Liu、Xihe Bi
DOI:10.1021/acs.orglett.7b00201
日期:2017.3.17
reported. In this reaction, tautomeric equilibria of β-enaminones are utilized to generate imine partners in situ. A hypothesized sequential Mannich addition/cyclization of imine tautomers and isocyanoacetates followed by an unprecedented ring-opening of the resultant 2-imidazolines and dehydration–condensation deliver the final 1,2,4,5-tetrasubstituted pyrrole products.
报道了出乎意料的银催化的β-烯胺酮和异氰基乙酸酯的级联反应,提供了官能化的吡咯衍生物。在该反应中,利用β-烯胺酮的互变异构平衡原位产生亚胺配体。假设亚胺互变异构体和异氰基乙酸酯的顺序Mannich加成/环化反应,然后空前的所得2-咪唑啉开环和脱水缩合反应生成最终的1,2,4,5-四取代吡咯产物。