Regioselective Bipyrrole Coupling of Pyrroles and 3-Substituted Pyrroles Using Phenyliodine(III) Bis(trifluoroacetate)
作者:Yasuyuki Kita、Toshifumi Dohi、Koji Morimoto、Motoki Ito
DOI:10.1055/s-2007-983798
日期:2007.9
A series of electron-rich bipyrroles were prepared by the regioselective, phenyliodine(III) bis(trifluoroacetate) (PIFA) induced oxidative coupling of pyrroles in the presence of bromotrimethylsilane. Using pyrrole and 3,4-disubstituted pyrroles gave exclusively 2,2′-linked bipyrroles without the formation of other bipyrrole regioisomers. The 3-alkyl- or 3-aryl-substituted pyrroles gave unsymmetrical
A facile three‐step synthesis of 2‐(2‐aminophenyl)pyrrole (1) and 2‐[(2‐aminomethyl)phenyl]pyrrole (2) is reported by use of Suzuki coupling of N‐Boc‐pyrrol‐2‐yl boronic acid (3) and o‐substituted aryl halogenides, followed by hydrogenation. The Pd‐catalyzed cross‐coupling reaction is optimized to be applicable to a wide range of substitued aryl halogenides, with electron‐donating and electron‐withdrawing
据报道,通过N -Boc-吡咯-2-基的Suzuki偶联,可以轻松实现三步合成2-(2-氨基苯基)吡咯(1)和2-[((2-氨基甲基)苯基]吡咯(2)。硼酸(3)和邻位取代的芳基卤化物,然后氢化。对Pd催化的交叉偶联反应进行了优化,以适用于具有电子给体和吸电子取代基5a,5b,5c,5d,5e,5f,5g的广泛取代的芳基卤化物。此外,邻溴代苯胺和3的Pd催化偶联可用于吡咯并[1,2 - c ]喹唑啉-5(6 H)-一(8)的一步制备。J.杂环化学。(2011)。