Cu(I)- and Cu(II)-Catalyzed Cyclo- and Michael Addition Reactions of Unsaturated β-Ketoesters
作者:Christoph Schotes、Antonio Mezzetti
DOI:10.1021/jo200776c
日期:2011.7.15
ethynyl(phenyl)sulfane (4) ([2 + 2] cycloaddition), and 1,2,5-trimethyl-1H-pyrrole (5) (Michael addition) in the presence of copper(I) (6) or copper(II) triflate (7) (1–2 mol %) in dichloromethane. This convenient protocol converts 1a and 1b to the corresponding cycloaddition (8–10) or Michael addition (11) products in good yields after reaction times of 0.5–3 h without requiring purified solvents