Synthesis of benzimidazoles via iridium-catalyzed acceptorless dehydrogenative coupling
作者:Xiang Sun、Xiao-Hui Lv、Lin-Miao Ye、Yu Hu、Yan-Yan Chen、Xue-Jing Zhang、Ming Yan
DOI:10.1039/c5ob00904a
日期:——
Benzimidazoles were prepared in good yieldsviathe iridium-catalyzed acceptorless dehydrogenative coupling of tertiary amines and arylamines.
苯并咪唑类化合物通过铱催化的受体无氧脱氢偶联反应,产率较高。
Access to Aromatic Ring-Fused Benzimidazoles Using Photochemical Substitutions of the Benzimidazol-2-yl Radical
作者:Fawaz Aldabbagh、Joanne O’Connell、Eoin Moriarty
DOI:10.1055/s-0032-1316775
日期:——
onto the benzimidazole-2-position. Photochemical five-, six-, and seven-membered cyclizations from 2-iodo-1-(ω-arylalkyl)-1H-benzimidazoles are described. This method of producing aromatic ring-fused benzimidazoles is significantly more efficient than literature radical protocols using chemical initiators, although 2-iodo-1-(ω-pyridin-2-ylalkyl)-1H-benzimidazoles preferentially undergo a nucleophilic ipso-substitution
1,1-Hydroboration of Fused Azole–Isoindole Analogues as an Approach for Construction of <i>B</i>,<i>N</i>-Heterocycles and Azole-Fused <i>B</i>,<i>N</i>-Naphthalenes
作者:Yong-gang Shi、Deng-Tao Yang、Soren K. Mellerup、Nan Wang、Tai Peng、Suning Wang
DOI:10.1021/acs.orglett.6b00485
日期:2016.4.1
Three isoelectronic analogues of pyrido[2,1-a]isoindole have been found to undergo a facile 1,1-hydroboration with HBMes2 borane, which provides a new and convenient method for the synthesis of B,N-heterocycles 1a–3a in high yields. Compounds 1a–3a can undergo photoelimination upon irradiation at 300 nm, generating heterocycle-fused B,N-naphthalene molecules 1b–3b, which display distinct yellow-green
Dual Catalysis in Domino<i>N</i>-Benzylation/Intramolecular C-H Arylation: Regio- and Chemoselective Synthesis of Annelated Nitrogen Heterocycles
作者:Joydev K. Laha、Neetu Dayal、Swati Singh、Rohan Bhimpuria
DOI:10.1002/ejoc.201402395
日期:2014.9
A general method has been developed for the synthesis of fused nitrogenheterocycles by using a domino N-benzylation/C–Harylation reaction sequence. The details and yields of the domino process were compared with those of the two-step literature protocol. Fused azaindoles, which are otherwise difficult to obtain, were synthesized by using this process. The unprecedented catalytic role of PPh3 in this
Copper(I)-Catalyzed Intramolecular Direct C-Arylation of Azoles with Aryl Bromides
作者:Yuan Huang、Wei Chen、Dan Zhao、Chen Chen、Huiqing Yin、Likang Zheng、Ming Jin、Shiqing Han
DOI:10.1002/cjoc.201300399
日期:2013.8
heterofused compounds by copper(I)‐catalyzed intramolecular coupling of non‐activated arylbromides with azoles is reported. With CuI as catalyst, 1,10‐phenanthroline as ligand, and K3PO4 as base, the reactions of 1‐(2‐bromobenzyl)‐1H‐imidazoles in DMF/o‐xylene (1:1, V:V) at 145°C afford the corresponding substituted 5H‐imidazo[2,1‐a]isoindoles in high yields via intramolecular C‐arylation.
据报导一种通过非活化的芳基溴化物与吡咯的铜(I)催化的分子内偶合获得5 H-咪唑并[2,1- a ]异吲哚杂稠化合物的简捷方法。以CuI为催化剂,1,10-菲咯啉为配体,K 3 PO 4为碱,1-(2-溴苄基)-1 H-咪唑在DMF /邻二甲苯中的反应(1:1,V:V)在145°C下通过分子内C-芳基化反应高收率提供相应的取代5 H-咪唑并[2,1- a ]异吲哚。