2,3-二取代的苯并[ b ]呋喃很容易在很温和的反应条件下通过钯/铜催化的各种邻碘苯甲醚和末端炔的交叉偶联反应,然后用I 2,PhSeCl或p-进行亲电环化而制得。 O 2 NC 6 H 4 SCl。芳基和乙烯基取代的炔烃以优异的收率进行亲电子环化。生物学上重要的呋喃吡啶可以通过这种方法以高产率制备。
A novel and efficient palladium-catalyzed cascade annulation/arylthiolation reaction has been developed to afford functionalized 3-sulfenylbenzofuran and 3-sulfenylindole derivatives in moderate to good yields from readily available 2-alkynylphenols and 2-alkynylamines in ionic liquids. This protocol provides a valuable synthetic tool for the assembly of a wide range of 3-sulfenylbenzofuran and 3-sulfenylindole