Synthesis of 2‐Alkyl‐Substituted Benzimidazoles by Thermal Decomposition of 2‐Azidobenzenamines in thePresence of an Aldehyde
作者:Jeffery M. Wallace、Björn C. G. Söderberg、Jeremiah W. Hubbard
DOI:10.1080/00397910600941497
日期:2006.11.1
Abstract 2‐Substituted benzimidazoles were prepared by reaction of 2‐azidoaminobenzenes with aldehydes under thermal conditions. The reaction probably proceeds via a sequential imine formation, azide decomposition forming a nitrene, and electrocyclization.
An efficient synthesis of ortho-aniline derivatives through aromatic C–H azidation catalyzed by Cu(OAc)2 have been disclosed. The amino group plays an ortho-directing effect in the azidation reactions, regiospecifically affording the mono-azidated derivative as the sole products.
A robust, click-chemistry-inspired procedure for radiolabeling of cyclic ureas was developed. This protocol, suitable for all carbonisotopes (11 C, 13 C, 14 C), is based on the direct functionalization of carbon dioxide: the universal building block for carbon radiolabeling. The strategy is operationally simple and reproducible in different radiochemistry centers, exhibits remarkably wide substrate
A one-pot synthesis of [1,2,3]triazolo[1,5-a]quinoxalines from 1-azido-2-isocyanoarenes with high bond-forming efficiency
作者:Dengke Li、Tingting Mao、Jinbo Huang、Qiang Zhu
DOI:10.1039/c6cc08543a
日期:——
An efficient approach to prepare 1,2,3-triazolo[1,5-a]quinoxaline scaffolds, starting from 1-azido-2-isocyanoarenes and terminal acetylenes or substituted acetaldehydes, has been developed.
New efficient synthesis of multisubstituted benzimidazoles and quinoxalin-2(1 H )-ones by a Ugi 4CC/aza-Wittig sequence starting from aromatic amine precursors
作者:Yan-Mei Yan、Yun Gao、Ming-Wu Ding
DOI:10.1016/j.tet.2016.07.048
日期:2016.9
An efficient preparation of multisubstituted benzimidazoles and quinoxalin-2(1H)-ones by Ugi 4CC/aza-Wittig sequence was developed. The 2-azidobenzenamines, obtained from CH activation of aromatic amine precursors, reacted with aldehydes, acids, and isocyanides to produce Ugi products, which were transformed to the benzimidazoles or quinoxalin-2(1H)-ones in moderate to good yields in further reaction