p-Sulfonic acid calixarenes as efficient and reusable organocatalysts for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones/-thiones
作者:Daniel L. da Silva、Sergio A. Fernandes、Adão A. Sabino、Ângelo de Fátima
DOI:10.1016/j.tetlet.2011.08.175
日期:2011.11
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
提出了一种通过Biginelli反应获得3,4-二氢嘧啶-2(1 H)-酮/硫酮的高效方法。这是基于使用少于化学计量的对磺酸杯芳烃作为有机催化剂。许多芳族醛以及脲或硫脲可用于成功合成相应的Biginelli加合物。所描述的方法没有含金属的催化剂,因此对于安全生产3,4-二氢嘧啶-2-(1 H)-具有药理学意义的一个/硫酮。此外,催化剂在反应中连续使用后,其效率不会受到损害。这是有关杯芳烃作为催化剂在多组分Biginelli反应中的应用的第一份报告。