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Poly(4-vinylpyridinium)hydrogen sulfate: An efficient and recyclable Bronsted acid catalyst for the synthesis of fused 3,4-dihydropyrimidin-2(1H)-ones and thiones

✍ Scribed by Janardhan, B.; Rajitha, B.; Crooks, Peter A.


Book ID
120531321
Publisher
Elsevier
Year
2016
Tongue
English
Weight
428 KB
Volume
20
Category
Article
ISSN
1319-6103

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## Abstract Fluoroboric acid supported on silica gel (HBF~4~‐SiO~2~) catalyzes efficiently the three component condensation of an aldehyde, a 1,3‐dicarbonyl compound and urea or thiourea to afford the corresponding 3,4‐dihydropyrimidin‐ 2(1__H__)‐ones and thiones in high yields. The ambient conditi