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p-Sulfonic acid calixarenes as efficient and reusable organocatalysts for the s...

Silva, Daniel L. da; Fernandes, Sergio A.; Sabino, Adão A.; Fátima, Ângelo de

A new and efficient methodology is proposed for obtaining 3,4-dihydropyrimidin-2(1H)-ones/-thiones through Biginelli reactions. It is based on the use of less than the stoichiometric amount of p-sulfonic acid calixarenes as organocatalysts. A number of aromatic aldehydes as well as urea or thiourea can be employed for successfully synthesizing the corresponding Biginelli adducts. The described methodology is de...

Date: 2018   |   Origin: Oasisbr
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