One-Pot Synthesis of Functionalized Benzimidazoles and 1H-Pyrimidines via Cascade Reactions of o-Aminoanilines or Naphthalene-1,8-diamine with Alkynes and p-Tolylsulfonyl Azide
作者:Yanguang Wang、Jin She、Zheng Jiang
DOI:10.1055/s-0029-1217515
日期:2009.7
A one-potsynthesis of functionalized benzimidazoles and 1H-pyrimidines via the cascadereactions of o-aminoanilines or naphthalene-1,8-diamine with terminal alkynes and p-tolylsulfonyl azide is reported. The protocol is efficient and general.
Simple inorganic base promoted C–N and C–C formation: synthesis of benzo[4,5]imidazo[1,2-<i>a</i>]pyridines as functional AIEgens used for detecting picric acid
作者:Kai Yang、Shi-He Luo、Si-Hong Chen、Xi-Ying Cao、Yong-Jun Zhou、Yan-Lan Lin、Yan-Ping Huo、Zhao-Yang Wang
DOI:10.1039/d1ob01424b
日期:——
Metal-free catalyzed intermolecular tandem Michaeladdition/cyclization has been developed for the synthesis of benzo[4,5]imidazo[1,2-a]pyridines from α-bromocinnamaldehyde and 2-substituted benzimidazoles. The reaction promoted by a simple inorganic base displays moderate to good yields and good functional group tolerance. The optical properties of some typical products have been investigated. We
无金属催化分子间串联迈克尔加成/环化已被开发用于从 α-溴肉桂醛和 2-取代苯并咪唑合成苯并[4,5]咪唑并[1,2- a ]吡啶。由简单的无机碱促进的反应显示出中等至良好的产率和良好的官能团耐受性。研究了一些典型产品的光学特性。我们发现,由于苯并[4,5]咪唑并[1,2- a ]吡啶的C1位存在限制分子内运动的苯环,作为一种新型的聚集诱导发射(AIE) luminogen (AIEgen),它们显示出非常好的固态荧光,量子产率高达 88.80%。重要的是,化合物3b的 AIE 性能可用于检测硝基芳香炸药苦味酸 (PA),检测限和淬灭常数分别为 42.5 nM 和 7.27 × 10 4 M -M。
substituted benzimidazolesfrom 1,1-dibromoethenes and o-diaminobenzenes is described. The reaction employs DABCO as the base and NMP as the solvent. A variety of substitutions on both 2-aryl-1,1-dibromoethenes and o-diaminobenzenes are tolerated. This new procedure is carried out under mildly basic conditions, which may provide a complementary route to the existing preparations of benzimidazoles.
Comparative Studies on Conventional and Microwave Synthesis of Some Benzimidazole, Benzothiazole and Indole Derivatives and Testing on Inhibition of Hyaluronidase
作者:Oztekin Algul、Andre Kaessler、Yagmur Apcin、Akin Yilmaz、Joachim Jose
DOI:10.3390/molecules13040736
日期:——
We have synthesized twelve 2-substituted benzimidazole, benzothiazole and indole derivatives using on both microwave irradiation and conventional heating methods. The microwave method was observed to be more beneficial as it provides an increase of yield from 3% to 113% and a 95 to 98 % reduction in time. All compounds were tested by a stains-all assay at pH 7 and by a Morgan-Elson assay at pH 3.5