Substrate-controlled and highly stereoselective synthesis of 2-aminobut-2-ene-1, 4-diones
摘要:
2-Methylthio-substituted 1,4-enediones, obtained from readily available aryl methyl ketones, were reacted with primary or secondary amines to afford the desired 1,4-diaryl-2-aminobut-2-ene-1,4-diones in excellent yields with high Z/E-stereoselectivity. (C) 2012 Elsevier Ltd. All rights reserved.
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