Nitropyrimidinone 1 revealed new reactivity upon treatment with active methylene compounds 2 under basic conditions. The N1-C2-C3-C4 moiety of 1 combined with two carbon units of 2 affording polyfunctionalized pyridones 4, which was hitherto unknown ring transformation. On the other hand, the N1-C2 moiety of 1 was transferred to the methylene group of 2 giving functionalized enamines 3. It was also
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, tautomericequilibria 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.