Bis(dibenzylideneacetone)palladium(0)/<i>tert-</i>Butyl Nitrite- Catalyzed Cyclization of<i>o</i>-Alkynylanilines with<i>tert-</i>Butyl Nitrite: Synthesis and Applications of Indazole 2-Oxides
作者:Gopal Chandru Senadi、Ji-Qi Wang、Babasaheb Sopan Gore、Jeh-Jeng Wang
DOI:10.1002/adsc.201700456
日期:2017.8.17
An efficient method for the synthesis of 1‐benzyl/arylindazole 2‐oxides via a bis(dibenzylideneacetone)palladium(0) [Pd(dba)2]/tert‐butyl nitrite (TBN)‐catalyzed reaction of o‐alkynylaniline derivatives with TBN is reported. The overall transformation involves the formation of three new bonds via N‐nitrosation (N–NO), 5‐exo‐dig cyclization (C–N) and oxidation (C=O). The notable features are the mild
一种通过双(二亚苄基丙酮)钯(0)[Pd(dba)2 ] /亚硝酸叔丁酯(TBN)催化邻位炔基苯胺衍生物与TBN合成1-苄基/芳基吲唑2-氧化物的有效方法被报道。整体转化涉及通过N亚硝化(N–NO),5 exo形成三个新键dig环化(C–N)和氧化(C = O)。显着的特征是反应条件温和,底物范围宽和TBN作为NO源和氧化还原助催化剂的双重作用。该策略用于吲哚-3-甲醛衍生物的合成以及具有药理活性的YC-1,抗癌剂(lonidamine)以及男性避孕实验药物AF-2785和adjudin(AF-2364)的正式合成。