A new bifunctional heterogeneous nanocatalyst for one-pot reduction-Schiff base condensation and reduction–carbonylation of nitroarenes
作者:Sara Sobhani、Farhad Omarzehi Chahkamali、José Miguel Sansano
DOI:10.1039/c8ra10212k
日期:——
for the reduction of nitroarenes in aqueous media using NaBH4 as a clean source of hydrogen generation at ambient temperature. Using the promising results obtained from the nitroarene reduction, this catalytic system is used for two one-pot protocols including reduction-Schiff base condensation and reduction–carbonylation of variousnitroarenes. In these reactions the in situ formed amines are further
在这项工作中,描述了 Pd-NHC-γ-Fe 2 O 3 - n -丁基-SO 3 H 的合成及其作为含有 Pd-NHC 和酸性官能团的双功能多相纳米催化剂的活性。这种新合成的纳米磁性催化剂通过 FT-IR、XPS、TEM、VSM、ICP 和 TG 分析等不同方法进行了充分表征。首先,评估了Pd-NHC-γ-Fe 2 O 3 - n -丁基-SO 3 H 对使用 NaBH 4在水介质中还原硝基芳烃的催化活性。作为在环境温度下产生氢气的清洁来源。利用从硝基芳烃还原中获得的有希望的结果,该催化系统用于两种一锅法,包括还原-席夫碱缩合和各种硝基芳烃的还原-羰基化。在这些反应中,原位形成的胺进一步与醛反应生成亚胺或羰基化为酰胺。在作为双功能催化剂的 Pd-NHC-γ-Fe 2 O 3 -n-丁基-SO 3 H存在下,以良好至高产率获得所需产物。在磁棒的帮助下,催化剂可以重复使用多达六个连续循环,而不会显着降低其催化活性。
Microwave Assisted Synthesis and Antimicrobial Evaluation of Schiff Bases of Indole-3-aldehyde
In order to develop new antimicrobial agents, a series of Schiff bases of indole-3-aldehyde were synthesized by microwave assisted synthesis by takingDMFas solvent and evaluated for their antimicrobial activity. All the synthesized compounds were characterized byIR,1HNMRand mass spectral analysis. All compounds were tested against five gram positive and five gram negative bacterial strains and one fungal strain. All compounds exhibited better activity against gram positive strains than against gram negative strains and the compounds were found more active againstS.aureusandB.subtilis.
Dual site reactivity of indole-3-Schiff bases with S/Se/Cl substituted ketenes for stereoselective C-4 substituted indole-β-lactams, biological evaluations, magic chloro effect and molecular docking studies
作者:Kiran Sharma、Pankaj kumar、Amita Sharma、Shamsher S. Bari、Gaganpreet Bhullar、Subhash C. Sahoo、Aman Bhalla
DOI:10.1016/j.bioorg.2024.107337
日期:2024.6
substitutions through dual site reactivity of indole-3-Schiff bases towards ketenes has been developed. The reaction proceeded in a stereospecific manner with the exclusive formation of -β-lactams assigned with respect to 3-H and 4-H. The synthesized novel β-lactams have been characterized with the help of elemental analysis (CHNS) and spectroscopic techniques H NMR, C NMR, DEPT 135, HSQC and IR. The configuration
已经开发出一种通过吲哚-3-希夫碱与烯酮的双位点反应性进行氯、硫和硒取代的-4吲哚-β-内酰胺杂化物的便捷方法。该反应以立体定向方式进行,仅形成相对于 3-H 和 4-H 的 -β-内酰胺。借助元素分析 (CHNS) 和光谱技术 H NMR、C NMR、DEPT 135、HSQC 和 IR 对合成的新型 β-内酰胺进行了表征。该结构是根据X射线晶体学数据进一步确定的。对抗菌特性的检查表明,只有具有氯取代特征的衍生物 和 表现出有效的活性,强调了最近创造的术语“神奇氯效应”的出现。分子对接分析为观察到的化合物抗菌活性提供了额外的支持。
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作者:L. K. Sal'keeva、M. T. Nurmaganbetova、O. Sh. Kurmanaliev、T. Kh. Gazizov
DOI:10.1023/a:1019671324617
日期:——
Reactions of bis(trimethylsilyl) hydrogen phosphite with Schiff bases derived from indole-3-carbaldehyde and aniline or ethyl p-aminobenzoate, as well as of diisopropyl hydrogen phosphite with N-benzylideneaniline, gave water-soluble sodium salts of alpha-aminophosphonic acids which are potential radioprotecting agents.
An Expeditious I<sub>2</sub>-Catalyzed Entry into 6<i>H</i>-Indolo[2,3-<i>b</i>]quinoline System of Cryptotackieine
作者:Prakash T. Parvatkar、Perunninakulath S. Parameswaran、Santosh G. Tilve
DOI:10.1021/jo901361x
日期:2009.11.6
A synthesis of a series of novel 6H-indolo[2,3-b]-quinolines with different substituents on the quinoline ring is described. The method involves reaction of indole-3-carboxyaldehyde with aryl amines in the presence of a catalytic amount of iodine in refluxing diphenyl ether to yield indolo[2,3-b]quinolines in one-pot. The present approach provides a new route for the synthesis of polycyclic structures related to an alkaloid cryptotackieine (neocryptolepine).