Unsaturated <i>O</i>- and <i>N</i>-Heterocycles from Carbohydrate Feedstocks

Lichtenthaler, Frieder W.

doi:10.1021/ar010071i

Cited by 402 publications

(204 citation statements)

References 41 publications

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“…A plausible mechanism for the formation of the selected product 4a-k in the presence of The structures of the new compounds 4a-d were confirmed by IR, 1 H, 13 C NMR and CHN as well as mass spectral data. For example, the IR spectrum of 4a showed distinct absorptions at 3435, 3324, and 1733, 1672 cm -1 corresponding to vibrations of its NH and CO groups.…”

Section: Resultsmentioning

confidence: 76%

“…Among these widespread heterocyclic compounds, nitrogen heterocycles occupy a distinct position because of their wide natural abundance and their applications as biologically active pharmaceuticals, agrochemicals, and functional materials are becoming more and more important [11][12][13]. Among them, the indole ring system is probably the most well-known heterocycle, a common and important feature of various natural products and medicinal agents [14].…”

Section: Introductionmentioning

confidence: 99%

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An efficient approach to the synthesis of some novel heterocycles related to indoline moiety using [BMIm]Cl catalysis

Youseftabar‐Miri

Hosseinjani-Pirdehi

2017

Asain J. Green Chem.

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The combination of isatins, active methylene reagents and 4-phenylurazole/ phthalhydrazide in the presence of ionic liquid ([BMIm]Cl) as a solvent catalyst was found to be a suitable and efficient method for the synthesis of the biologically important spirooxindoles. The features of this procedure were characterized by one-pot procedure, reasonable reaction times, fairly high yields, and simple isolation procedures. The ionic liquid can be easily separated and reused for several times. KEYWORDS Ionic liquidMulti-compound reactions Spirooxindole Isatin Pyrazole Graphical AbstractAn efficient approach to the synthesis ...

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Section: Resultsmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

An efficient approach to the synthesis of some novel heterocycles related to indoline moiety using [BMIm]Cl catalysis

Youseftabar‐Miri

Hosseinjani-Pirdehi

2017

Asain J. Green Chem.

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“…[13][14][15] Porém, é importante destacar que dentro dessa classe estão incluídas muitas substâncias, mas poucas são as que efetivamente tem o potencial econômico para atrair o investimento das indústrias químicas. 16 Considera-se que em realidade são quatro carboidratos que têm esse potencial econômico desejado para produção de compostos químicos: celulose, amido, quitina e sacarose (Figura 4).…”

Section: Discussionunclassified

Carboidratos como fonte de compostos para a indústria de química fina

Ferreira¹,

Silva²,

Ferreira³

2013

Quím. Nova

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Recebido em 4/7/13; aceito em 10/10/13; publicado na web em 24/10/13 CARBOHYDRATES AS A SOURCE OF COMPOUNDS FOR FINE CHEMICAL INDUSTRY. Coal, oil, natural gas, and shale gas are biomass that is formed millions of years ago. These are non-renewable and depleting, even considering the recent discovery of new sources of oil in the presalt and new technologies for the exploitation of shale deposits. Currently, these raw materials are used as a source of energy production and are also important for the production of fine chemicals. Since these materials are finite and their (oil) price is increasing, it is clear that there will be a progressive increase in the chemical industry to use renewable raw materials as a source of energy, an inevitable necessity for humanity. The major challenge for the society in the twenty first century is to unite governments, universities, research centers, and corporations to jointly act in all areas of science with one goal of finding a solution to global problems, such as conversion of biomass into compounds for the fine chemical industry.Non-renewable raw materials are used in the preparation of fuels, chemical intermediates, and derivatives for the fine chemical industry. However, their stock in nature has a finite duration, and their price is high and will likely increase with their depletion. In this scenario, the alternative is to use renewable biomass as a replacement for petrochemicals in the production of fine chemicals. As the production of biomass-based carbohydrates is the most abundant in nature, it is judicious to develop technologies for the generation of chain products (fuels, chemical intermediates, and derivatives for the fine chemicals industry) using this raw material. This paper presents some aspects and opportunities in the area of carbohydrate chemistry toward the generation of compounds for the fine chemical industry.Keywords: fine chemicals; chains fine chemical from carbohydrates; renewable biomasses. INTRODUÇÃOA compreensão humana sobre a natureza e a vida é baseada em nosso conhecimento da química, pois, em realidade, todos os processos da vida são controlados por reações químicas.Há vários problemas globais 1,2 em que a química pode ser o elemento chave de sua solução e, desta forma, promover o avanço social e econômico dos países em um mundo sem fronteiras. A saber: 1. biodiversidade e conversão de biomassa em matérias-primas; 2. fontes alternativas de energia limpa e renovável; 3. produção sustentável de fármacos; 4. a produtividade agrícola para alimentar o crescimento populacional; 5. qualidade da água para uso humano; 6. materiais reclicáveis e pouco persistentes; 7. nível dióxido de carbono e seu aproveitamento; 8. risco de desaparecimento de alguns elementos químicos por dispersão; 9. nanotecnologia e nanotoxicologia; 10. educação em todos níveis e em especial em química e; 11. responsabilidade social da química.O grande desafio da sociedade no século XXI é unir governos, universidades, centros de pesquisa e corporações para que atuem conjuntamente e...

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“…Approximately 75% of the biomass produced by Nature through the process of photosynthesis corresponds to carbohydrates, but only between 3-4% of these compounds are used for food and non-food purposes [6]. Therefore the use of carbohydrates as raw materials for the production of basic chemicals is an area of increasing interests [7][8][9][10][11]. In this sense, a variety of glycols (1,2-ethanediol, 1,2-propanediol, 1,2-butanediol or 2,3-butanediol) can be obtained from carbohydrates [1][2][3][4][5]12] as well as from glycerol [13,14] via bio-or chemocatalytic reactions.…”

Section: Introductionmentioning

confidence: 99%

A Chalcone‐Based Highly Selective and Sensitive Chromofluorogenic Probe for Trivalent Metal Cations

et al. 2015

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ElsevierCliment Olmedo, MJ.; Corma Canós, A.; Hernández, JC.; Hungría, AB.; Iborra Chornet, S.; Martínez Silvestre, S. (2012). Biomass into chemicals: One-pot two-and three-step synthesis of quinoxalines from biomass-derived glycols and 1,2-dinitrobenzene derivatives using supported gold nanoparticles as catalysts. AbstractAn efficient and selective one-pot two steps, method for the synthesis of quinoxalines by oxidative coupling of vicinal diols with 1,2-phenylenediamine derivatives, has been developed by using gold nanoparticles supported on nanoparticulated ceria (Au/CeO 2 ) or hydrotalcite (Au/HT) as catalysts and air as oxidant, in absence of any homogeneous base. Reaction kinetics shows that the reaction controlling step is the oxidation of the diol to α-hydroxycarbonyl compound.Furthermore, a one-pot three steps synthesis of 2-methylquinoxaline starting from 1,2-dinitrobenzene and 1,2-propanediol has been successfully carried out with 98% conversion and 83% global yield to the final product.

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Unsaturated O- and N-Heterocycles from Carbohydrate Feedstocks

Cited by 402 publications

References 41 publications

An efficient approach to the synthesis of some novel heterocycles related to indoline moiety using [BMIm]Cl catalysis

An efficient approach to the synthesis of some novel heterocycles related to indoline moiety using [BMIm]Cl catalysis

Carboidratos como fonte de compostos para a indústria de química fina

A Chalcone‐Based Highly Selective and Sensitive Chromofluorogenic Probe for Trivalent Metal Cations

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