β-Cyclodextrin-catalyzed one-pot synthesis of aryl benzothiazoles.
Journal name: World Journal of Pharmaceutical Research
Original article title: Β-cyclodextrin catalysed one-pot synthesis of aryl benzothiazoles from dimethylacetals in aqueousphase
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Ravi Lakkakula, Arnab Roy, Khagga Mukkanti and Mendu Narender
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World Journal of Pharmaceutical Research:
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Full text available for: Β-cyclodextrin catalysed one-pot synthesis of aryl benzothiazoles from dimethylacetals in aqueousphase
Source type: An International Peer Reviewed Journal for Pharmaceutical and Medical and Scientific Research
Doi: 10.20959/wjpr20197-15135
Copyright (license): WJPR: All rights reserved
Summary of article contents:
Introduction
The synthesis of heterocyclic compounds, particularly benzothiazoles, has garnered significant attention due to their diverse biological activities and applications in pharmaceutical chemistry and material sciences. Traditionally, various methods have been employed to create 2-substituted benzothiazoles, often involving harsh reaction conditions or toxic reagents. The recent study by Lakkakula et al. introduces a novel one-pot synthesis approach using β-cyclodextrin as a mild catalyst in an aqueous environment at elevated temperatures, aiming to improve the efficiency and eco-friendliness of the synthesis process.
Supermolecular Catalyst: β-Cyclodextrin
One crucial aspect of this study is the utilization of β-cyclodextrin (β-CD), a cyclic oligosaccharide known for forming inclusion complexes with organic substrates. This property enhances the solubility of hydrophobic reactants in an aqueous medium, facilitating chemical reactions that would otherwise be unfavorable in water. The study demonstrates that β-CD serves as an effective catalyst, promoting the hydrolysis of dimethyl acetals and the subsequent reaction with 2-amino thiophenol to yield aryl benzothiazoles with high yields and minimal by-products. This use of β-CD marks a significant advancement in supramolecular catalysis, leveraging non-covalent interactions to activate reactants efficiently.
Environmentally-Friendly Synthesis Method
The research emphasizes the eco-friendly nature of conducting organic reactions in water, a non-toxic, plentiful, and inexpensive solvent. Replacing harmful organic solvents with water not only addresses environmental concerns but also enhances the safety of the chemical processes involved. The study showcases how this method can mitigate the drawbacks of traditional synthesis routes which often involve volatile organic compounds and hazardous conditions. The successful implementation of β-CD in promoting this synthesis underscores the potential of combining supramolecular chemistry with an environmentally benign reaction medium.
Improved Reaction Conditions
Another significant finding of the study is the improved reaction conditions facilitated by the use of β-CD. The synthesis of 2-arylbenzothiazoles was achieved under milder conditions, at 50°C, significantly reducing both reaction time and the formation of unwanted side products. The use of β-CD not only enhanced the yield of the products but also allowed for the recovery and reuse of the catalyst, adding to the overall sustainability and cost-effectiveness of the method. Reactions performed without β-CD resulted in negligible product formation, highlighting the necessity of this catalyst for successful synthesis.
Conclusion
In conclusion, Lakkakula et al.'s research paves the way for a more efficient, safe, and environmentally-friendly synthesis of 2-arylbenzothiazoles using β-cyclodextrin as a catalyst in water. The findings illustrate the potential for biodegradable, non-toxic, and readily available compounds, enhancing the appeal of this synthetic approach in pharmaceutical applications. The study not only advances the field of supramolecular catalysis but also reinforces the importance of sustainable practices in organic chemistry.
FAQ section (important questions/answers):
What is the main focus of this research article on benzothiazoles?
The research presents a synthetic protocol for 2-arylbenzothiazoles from dimethylacetals and 2-amino thiophenol using β-cyclodextrin as a catalyst in aqueous phase at 50°C, aimed at developing eco-friendly methods.
What are the biological activities of benzothiazole derivatives?
Benzothiazole derivatives exhibit diverse biological activities, including anticonvulsant, antidiabetic, anticancer, antimicrobial, antiviral, antihelmintic, antitubercular, antimalarial, analgesic, fungicidal, and anti-inflammatory properties.
What is the significance of using β-cyclodextrin in this synthesis?
β-Cyclodextrin is employed as a mild and efficient catalyst to form inclusion complexes, enhancing the catalytic reaction in water and providing an eco-friendly alternative to conventional organic solvents.
What synthetic method was highlighted for benzothiazole derivatives?
The highlighted method involves the condensation of 2-aminothiophenol with aldehyde dimethyl acetals, facilitated by β-cyclodextrin, yielding high yields without toxic waste or unwanted by-products.
What were the yields achieved in the synthesis of arylbenzothiazoles?
The reactions resulted in excellent yields, ranging from 65% to 86%, demonstrating the efficiency of the β-cyclodextrin catalyzed method for synthesizing 2-arylbenzothiazole compounds.
What analytical techniques were used to characterize the synthesized compounds?
The synthesized compounds were characterized using IR spectroscopy, 1H NMR, 13C NMR, and mass spectral analysis to confirm their structures and ensure accuracy.
Glossary definitions and references:
Scientific and Ayurvedic Glossary list for “β-Cyclodextrin-catalyzed one-pot synthesis of aryl benzothiazoles.”. This list explains important keywords that occur in this article and links it to the glossary for a better understanding of that concept in the context of Ayurveda and other topics.
1) Water:
Water is highlighted as a crucial solvent in this research for the synthesis of aryl benzothiazoles. Its use is relevant due to its non-toxic nature, availability, and environmental friendliness compared to traditional organic solvents. The study explores how water can facilitate organic reactions, promoting greener chemistry practices.
2) Table:
The table in the article presents experimental results systematically, showcasing various yield percentages for different aryl benzothiazoles synthesized. Its relevance lies in providing clear, organized data that supports the study's efficacy in achieving high yields through the proposed catalytic method using β-cyclodextrin in an aqueous medium.
3) Purification:
Purification refers to the process of isolating the desired products from the reaction mixture to achieve purity. In the experiments, flash column chromatography is used, which is relevant as it helps ensure that the final products of the synthesis are free of impurities and correctly characterized by spectroscopic methods.
4) Observation:
Observation in this context relates to monitoring the reactions and the outcomes carefully during the synthesis process. It's relevant to identifying reaction completion through TLC, which guides the further steps in purification and analysis, ultimately ensuring accurate and reliable data reporting in the research.
5) Discussion:
The discussion section interprets the results obtained from the experiments. Its relevance is to analyze the implications of using β-cyclodextrin as a catalyst, compare it with existing methods, and underscore the advantages of their eco-friendly synthetic approach, providing insights into the potential applications of the synthesized compounds.
6) Science (Scientific):
Science, as a fundamental pursuit of knowledge, is central to the research study. Its relevance can be seen in the systematic application of chemical principles and methodologies to achieve desired outcomes in synthesis, thereby advancing our understanding of compound behavior and applications in pharmaceutical development and environmental sustainability.
7) Charan:
Charan likely refers to Dr. Bhim Charan Maiti, one of the acknowledgments in the research. His relevance might be linked to providing guidance or support in the experimental process or appreciating contributions in oversight, reflecting collaborative efforts which are essential in academic and scientific research endeavors.
8) Sharman (Sarma, Sharma, Sarman):
Sharma likely refers to Dr. Somesh Sharma, another individual acknowledged in the study. His relevance could imply that he played a significant role in facilitating the research process, providing mentorship, or contributing expertise, highlighting the cooperative nature of scientific inquiry and the importance of mentorship in research.
9) Medium:
Medium in this research refers to the solvent or environment in which reactions occur, specifically water. Its relevance underscores the study's focus on aqueous-phase synthesis, promoting sustainable practices. The medium directly impacts reaction outcomes, efficiency, and safety, emphasizing the significance of solvent choice in organic synthesis.
10) India:
India is where the research institutions involved, GVK Biosciences and Jawaharlal Nehru Technological University, are located. Its relevance relates to the context of the study, showcasing advancements in Indian science, particularly in pharmaceutical research, and contributing to the global dialogue on green chemistry and sustainable methodologies.
11) Glass:
Glass refers to the material of the silica gel glass plates used for thin layer chromatography (TLC) in monitoring reactions. Its relevance is in providing a surface for separation and analysis of compounds, emphasizing the use of simple yet effective techniques in the research process for qualitative assessment.
12) Ravi (Ravin):
Ravi refers to Dr. Ravi Lakkakula, a co-author of the research. His relevance underscores collaboration, highlighting the contributions of researchers in the development of new synthetic methodologies. It emphasizes the importance of teamwork in achieving scientific advancements and fostering innovative solutions in pharmaceutical chemistry.
13) Pur:
Poor in the context of this research may relate to aspects like 'poor yields' experienced in previous methodologies discussed in the introduction. Its relevance is crucial in justifying the need for the proposed method, which aims to overcome these issues by offering higher yields and improved synthesis conditions.
Other Science Concepts:
Discover the significance of concepts within the article: ‘β-Cyclodextrin-catalyzed one-pot synthesis of aryl benzothiazoles.’. Further sources in the context of Science might help you critically compare this page with similair documents:
Thin Layer Chromatography, Pharmaceutical Chemistry, Toxic waste products, Catalytic system, Environmentally benign, High yield, One-pot synthesis, Inclusion complex, Reaction medium, One pot reaction, Biomimetic approaches, Hydrophobic cavities, Bioactive Molecule, High value compounds.