Palladium-Catalyzed Indole and Azaindole Synthesis by Direct Annulation of Electron-Poor<i>o</i>-Chloroanilines and<i>o</i>-Chloroaminopyridines with Aldehydes
for the synthesis of 2-unsubstituted indolesand azaindoles has been developed by the palladium-catalyzed directannulation of electron-poor O-chloro/bromoanilines and O-chloroaminopyridines with aldehydes.Coupled with the previous results of Jia and Zhu, this allows rapidaccess to a variety of 2-unsubstituted indoles and azaindoles startingfrom simple and easily accessible precursors.
Synthesis of Substituted 4-, 5-, 6-, and 7-Azaindoles from Aminopyridines via a Cascade C–N Cross-Coupling/Heck Reaction
作者:Marina J. D. Pires、Diogo L. Poeira、Sara I. Purificação、M. Manuel B. Marques
DOI:10.1021/acs.orglett.6b01500
日期:2016.7.1
cascade C–N cross-coupling/Heckreaction of alkenyl bromides with amino-o-bromopyridines is described for a straightforward synthesis of substituted 4-, 5-, 6-, and 7-azaindoles using a Pd2(dba)3/XPhos/t-BuONa system. This procedure consists of the first cascade C–N cross-coupling/Heck approach toward all four azaindole isomers from available aminopyridines. The scope of the reaction was investigated and
一种实用的钯催化级联C-N交联偶合/的Heck反应的链烯基溴化物与氨基ö -bromopyridines用于使用Pd取代的4-,5-,6-,和7-氮杂吲哚的合成简单描述2( dba)3 / XPhos / t -BuONa系统。此过程包括对来自可用氨基吡啶的所有四个氮杂吲哚异构体的第一个级联C–N交叉偶联/ Heck方法。研究了反应的范围,并使用了几种烯基溴化物,从而可以得到不同的取代的氮杂吲哚。该协议被进一步探讨用于Ñ取代氨基Ò -bromopyridines。
Vinylic MIDA Boronates: New Building Blocks for the Synthesis of Aza-Heterocycles
A two‐step synthesis of structurally diverse pyrrole‐containingbicyclic systems is reported. ortho‐Nitro‐haloarenes coupled with vinylic N‐methyliminodiacetic acid (MIDA) boronates generate ortho‐vinyl‐nitroarenes, which undergo a “metal‐free” nitrene insertion, resulting in a new pyrrole ring. This novel synthetic approach has a wide substrate tolerance and it is applicable in the preparation of