A general synthesis of diversely substituted indazoles and hetero-aromatic derivatives from o-halo-(het)arylaldehydes or -phenones
作者:Emmanuelle Dubost、Silvia Stiebing、Thibault Ferrary、Thomas Cailly、Frédéric Fabis、Valérie Collot
DOI:10.1016/j.tet.2014.07.092
日期:2014.11
set of variously substituted indazoles and hetero-aromatic derivatives were synthesized from o-halo-(het)arylaldehydes using a palladium catalyzed amination followed by cyclization. Starting from phenones, this process was extended to give 3-substituted indazoles. Moreover, N-1-substituted-indazoles can be reached by this strategy using an optional selective N-1-alkylation step during the process. This
一组不同取代的吲唑和杂芳族衍生物是使用钯催化的胺化反应由邻-卤-(杂)芳基醛合成的,然后环化。从苯酮开始,该过程扩展为得到3-取代的吲唑。此外,在该方法中,使用任选的选择性N-1-烷基化步骤,可以通过该策略获得N -1-取代的吲唑。这种方法为区域选择性取代的吲唑的合成提供了一条通用而简便的途径。