Carboxylate-Directed Tandem Functionalisations of α,β-Dihaloalkenoic Acids with 1-Alkynes: A Straightforward Access to (Z)-Configured, α,β-Substituted γ-Alkylidenebutenolides
作者:Samuel Inack Ngi、Khalil Cherry、Virginie Héran、Laurent Commeiras、Jean-Luc Parrain、Alain Duchêne、Mohamed Abarbri、Jérôme Thibonnet
DOI:10.1002/chem.201102570
日期:2011.12.2
and stereoselectively leads to rarely described (Z)‐3‐halo‐5‐ylidene‐5H‐furan‐2‐ones. These compounds are subsequently able to undergo classical Pd‐catalysed cross‐coupling reactions, providing 3‐substituted and 3,4‐disubstituted 5‐ylidene‐5H‐furan‐2‐ones (see scheme).
容易和温和的铜(I)催化的易获得的(E)-2,3-二卤代丙酸衍生物的区域选择性和立体选择性内酯化导致很少描述的(Z)-3-卤代-5-亚烷基-5 H-呋喃- 2个 这些化合物随后能够进行经典的Pd催化的交叉偶联反应,提供3-取代的和3,4-二取代的5-亚烷基-5 H-呋喃-2-(参见方案)。