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Your search keyword '"ORGANIC solvents"' showing total 2 results
Start Over Descriptor "ORGANIC solvents" Search Limiters Peer Reviewed Topic aldehydes Topic catalysis Topic organic synthesis Publication Year Range Last 50 years Journal tetrahedron letters: international organ for the rapid publication of preliminary communications in organic chemistry
2 results on '"ORGANIC solvents"'

1. Solvent-free synthesis of functionalized pyridine derivatives using Wells-Dawson heteropolyacid as catalyst

Author

Sanchez, Laura M., Sathicq, Ángel G., Jios, Jorge L., Baronetti, Graciela T., Thomas, Horacio J., and Romanelli, Gustavo P.

Subjects
*ORGANIC synthesis, *ORGANIC solvents, *PYRIDINE, *CONDENSATION, *ORGANIC acids, *ACETATES, *RING formation (Chemistry), *ALDEHYDES, *CATALYSIS
Abstract

Abstract: Wells-Dawson heteropolyacids (H6P2W18O62·24H2O) were used as catalysts in the Hantzsch-like multicomponent condensation reaction with 3-formylchromones as aldehyde component, a β-ketoester and ammonium acetate, under solvent-free conditions at 80°C. Although the desired products were obtained, functionalized pyridines were the main reaction product and became the alternative route to dihydropyridine ring formation. Based on the proposed mechanisms for the formation of each of the obtained products, the multicomponent reaction was modified to afford only the functionalized pyridines (60–99%). Our procedure represents a clean alternative for the synthesis of several highly functionalized pyridines. [Copyright &y& Elsevier]

Published
2011
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2. Baker’s yeast catalyzed one-pot three-component synthesis of polyfunctionalized 4H-pyrans

Author

Pratap, Umesh R., Jawale, Dhanaji V., Netankar, Prashant D., and Mane, Ramrao A.

Subjects
*ORGANIC synthesis, *PYRAN, *CONDENSATION, *ALDEHYDES, *NITRILES, *ACETAMIDE, *CATALYSIS, *ORGANIC solvents
Abstract

Abstract: Baker’s yeast catalyzed one-pot three-component cyclocondensation of aryl aldehydes, malononitrile, and β-dicarbonyls in organic medium has been carried out to obtain polyfunctionalized 4H-pyrans. The reaction has been carried out at room temperature in organic solvent, dimethylacetamide and the products obtained in good to moderate yields with simple work up procedure. [Copyright &y& Elsevier]

Published
2011
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