α- and β-Stannyl Trifluoromethylbutenoates: Regioselective Preparation and Use in Copper(I)-Catalyzed Allylation and Propargylation Reactions
作者:Yvan Carcenac、Khalid Zine、Jean-Claude Kizirian、Jérôme Thibonnet、Alain Duchêne、Jean-Luc Parrain、Mohamed Abarbri
DOI:10.1002/adsc.200900828
日期:——
hydrostannylation of ethyl 4,4,4‐trifluorobutynoate 1 with tributyltin hydride at room temperature is highly regio‐ and stereoselective, providing good yields of β‐trifluoromethyl (Z)‐α‐ or (Z)‐β‐stannylacrylates 2. Vinylstannanes 2 undergo a copper(I)‐catalyzed coupling reactions with allylic or propargylic bromides leading selectively to good yields of the corresponding allylated or propargylated products
4,4,4-三氟丁酸乙酯1在室温下与氢化三丁基锡的无钯加氢苯乙烯基化反应具有很高的区域选择性和立体选择性,可提供高产率的β-三氟甲基(Z)-α-或(Z)-β-锡烷基丙烯酸酯2。乙烯基stannanes 2与烯丙基或炔丙基溴进行铜(I)催化的偶联反应,从而选择性地获得相应的烯丙基或炔丙基化产物的良好收率,而无需烯丙基或烯丙基移位。