Bulk Gold-Catalyzed Reactions of Diazoalkanes with Amines and O2 to Give Enamines
作者:Yibo Zhou、Robert J. Angelici、L. Keith Woo
DOI:10.1007/s10562-010-0339-7
日期:2010.6
particles, catalyzes reactions of diazoalkanes E(H)C=N2, where E is CO2Et or PhC(O), with amines R1R2NH and O2 to give enamine products (R1R2N)(E)C=CH(E) in 58–94% yield. The reactions are proposed to occur by initial formation of surface-bound (E)(H)C: carbene groups that are attacked by nucleophilic amines. The enamine products are very different than those obtained in reactions catalyzed by homogeneous
2-Imidazolidinone benzofurans as unexpected outcome of the Lewis acid mediated Nenitzescu reaction
作者:Tomas Horsten、Temitayo Omowumi Alegbejo Price、Luc Van Meervelt、Flavio da Silva Emery、Wim Dehaen
DOI:10.1039/d1nj04965h
日期:——
The Lewisacidmediated Nenitzescu reaction with piperazinone enaminoesters surprisingly afforded rearranged 2-imidazolidinone 5-hydroxybenzofurans. The reaction was optimised and a scope study was performed. A one-pot two-step procedure was realised starting directly from 1,2-diaminoethane, diethyl acetylene dicarboxylate and 1,4-benzoquinone. A plausible reaction mechanism is proposed.