N-取代的吲哚衍生物的有效合成通过Pd催化的一锅多组分耦合方法与C(SP的切割组合实现3)N个债券。该偶联过程涉及芳基碘化物,炔烃和胺的三种或四种组分。环戊二烯-膦配体显示出高效率。可以使用多种芳基碘化物,包括环状和无环叔氨基芳基碘化物,以及取代的1-溴-2-碘代苯衍生物。可以使用被烷基,芳基或三甲基甲硅烷基取代的对称和不对称炔烃。环仲胺(例如哌啶,吗啉,4-甲基哌啶,1-甲基哌嗪,2-甲基哌啶)和无环胺(包括仲胺和伯胺)均显示出良好的反应性。苯并硅氧烷[2,3- b ]吲哚的合成证明了所得吲哚衍生物的进一步应用。
Cyclopentadiene–Phosphine/Palladium-Catalyzed Cleavage of C–N Bonds in Secondary Amines: Synthesis of Pyrrole and Indole Derivatives from Secondary Amines and Alkenyl or Aryl Dibromides
作者:Weizhi Geng、Wen-Xiong Zhang、Wei Hao、Zhenfeng Xi
DOI:10.1021/ja308950d
日期:2012.12.19
An efficient Pd-catalyzed cleavage of C(sp(3))-Nbonds in secondary amines and a consequent C(sp(2))-N and C(sp(3))-N coupling process was developed. Various secondary amines could be used to react with alkenyl or aryl dibromides, affording pyrroles and indoles in high yields. Cyclopentadiene-phosphine ligands, a new type of P-olefin ligand, were found to be able to promote the efficiency of this Pd-catalyzed