Silica sulfuric acid efficiently catalyzes the three-component Biginelli reaction between an aldehyde, beta-dicarbonyl compound and urea or thiourea in refluxing ethanol to afford the corresponding dihydropyrinudinones in high yields. The catalyst is reusable and can be applied several times without any decrease in the yield of the reactions. (C) 2003 Elsevier Science Ltd. All rights reserved.
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Indian Inst Chem Technol, Div Organ Chem 2, Hyderabad 500007, Andhra Pradesh, IndiaIndian Inst Chem Technol, Div Organ Chem 2, Hyderabad 500007, Andhra Pradesh, India
Reddy, CV
Mahesh, M
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Indian Inst Chem Technol, Div Organ Chem 2, Hyderabad 500007, Andhra Pradesh, IndiaIndian Inst Chem Technol, Div Organ Chem 2, Hyderabad 500007, Andhra Pradesh, India
Mahesh, M
Raju, PVK
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Indian Inst Chem Technol, Div Organ Chem 2, Hyderabad 500007, Andhra Pradesh, IndiaIndian Inst Chem Technol, Div Organ Chem 2, Hyderabad 500007, Andhra Pradesh, India
Raju, PVK
Babu, TR
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Indian Inst Chem Technol, Div Organ Chem 2, Hyderabad 500007, Andhra Pradesh, IndiaIndian Inst Chem Technol, Div Organ Chem 2, Hyderabad 500007, Andhra Pradesh, India
Babu, TR
Reddy, VVN
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