Palladium‐Catalyzed Regioselective C−H Arylation of 4‐Azaindazole at C3, C5 and C7 Positions
作者:Soukaina Faarasse、Saïd El Kazzouli、Otmane Bourzikat、Stéphane Bourg、Samia Aci‐Sèche、Pascal Bonnet、Franck Suzenet、Gérald Guillaumet
DOI:10.1002/adsc.202001421
日期:2021.8.13
Direct and site-selective C5 and C7 palladium-catalyzed C−H arylations of 4-azaindazole N-oxide have been achieved. A bidentate ligand and Pd(OAc)2 catalyst in toluene promoted the activation of C5 position, while a phosphine ligand and PdCl2 catalyst in DMA directed the arylation at C7 position. Using this new method, the synthesis of C5, C7-diarylated 4-azaindazole N-oxides as well as the C3, C5
已经实现了直接和位点选择性 C5 和 C7 钯催化的 4-氮杂吲唑N-氧化物的C-H 芳基化。甲苯中的二齿配体和 Pd(OAc) 2催化剂促进了 C5 位的活化,而DMA 中的膦配体和 PdCl 2催化剂指导了 C7 位的芳基化。使用这种新方法,实现了C5、C7-二芳基化 4-氮杂吲唑N-氧化物以及 C3、C5、C7-三芳基化 4-氮杂吲唑的合成,以实现未来的药用化合物开发。