AbstractThe palladium (II) catalyzed direct C3‐(sp2)−H alkenylation of five membered heterocyclic aldehydes has been developed using 3‐aminobutanoic acid as a catalytic transient directing group. A wide range of heterocyclic aldehydes reacted with various acrylates to afford highly site‐selective C3‐alkenylated products. This method features an exclusive E‐selective alkenylation at the C3‐position of heterocyclic aldehydes with a broad substrate scope. The protocol also proved to be useful to construct the mechanochromic luminogen.
摘要 以 3-aminobutanoic acid 为催化瞬时指导基团,开发了
钯 (II) 催化五元杂环醛的直接 C3-(sp2)-H 烯化反应。多种杂环醛与各种
丙烯酸酯发生反应,得到高位点选择性的 C3-烯基化产物。这种方法的特点是在杂环醛的 C3 位进行独有的 E 选择性烯化,具有广泛的底物范围。事实证明,该方法还有助于构建机械变色发光剂。