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
α-亚烷基β-酮酸酯2-碳乙氧基环戊烯酮(1a)和丙烯酸2-苯甲酰基丙烯酸乙酯(1b)与1,2-二甲基丁二烯(2)(Diels-Alder),N-苄基-N-(环己基乙炔基)-4-甲基苯磺酰胺反应(3)(菲西尼反应),乙炔基(苯基)硫烷(4)([2 + 2]环加成)和1,2,5-三甲基-1 H-吡咯(5)(迈克尔加成)在铜存在下(I)(6)或三氟甲磺酸铜(II)(7)(1-2摩尔%)在二氯甲烷中。此便捷协议将1a和1b转换为相应的环加成(8 – 10)或Michael加成(11)产物在0.5 – 3 h反应时间后收率很高,无需纯化溶剂或惰性气体气氛。