Metal-free electrochemical [3 + 2] heteroannulation of anilines with pyridines enabled by dual C–H radical aminations
作者:Mu-Jia Luo、Xuan-Hui Ouyang、Yan-Ping Zhu、Yang Li、Jin-Heng Li
DOI:10.1039/d1gc02922c
日期:——
electrochemical intermolecular [3 + 2] heteroannulation of anilines with electron-deficient pyridines enabled by dual C–H radicalaminations for producing functionally diverse benzo[4,5]imidazo[1,2-a]pyridines is described. The site-selectivity of aminations of aryl C(sp2)–H bonds relies on the electronic effect of two reaction partners: each contributed two reactive sites (a C(sp2)–H bond and a nitrogen
Copper-Catalyzed Inter- and Intramolecular C–N Bond Formation: Synthesis of Benzimidazole-Fused Heterocycles
作者:Sk. Rasheed、D. Nageswar Rao、Parthasarathi Das
DOI:10.1021/acs.joc.5b01396
日期:2015.9.18
Cu (II)-catalyzed, inter/intramolecular C–N bond formation for the synthesis of various benzimidazole-fused heterocycles in a concise manner has been reported. The robustness of this reaction is demonstrated by the synthesis of a series of benzimidazole-fused heteroaromatics (e.g., pyrido[1,2-a] benzimidazole, benzimidazo[1,2-a]quinolines, benzimidazo [1,2-a]pyrazine, benzo[4,5] imidazo[2,1-b]thiazoles)
据报道,一种Cu(II)催化的,分子间/分子内CN键的形成可用于简明合成各种苯并咪唑稠合的杂环。通过一系列苯并咪唑稠合的杂芳族化合物(例如,吡啶并[1,2- a ]苯并咪唑,苯并咪唑[1,2- a ]喹啉,苯并咪唑并[1,2- a ]吡嗪)的合成证明了该反应的稳健性。一锅中直接来自2-氨基杂戊烯类和2-碘芳基硼酸的苯并[4,5]咪唑并[ 2,1- b ]噻唑类化合物 C–N键形成的新型级联方案是通过Chan–Lam型偶联的独特结合然后进行Ullmann型反应来进行的。