A mild route for one pot synthesis of 5,6-unsubstituted 1,4-dihydropyridines catalyzed by sulphated mixed metal oxides
作者:Sandeep S. Kahandal、Sandip R. Kale、Manoj B. Gawande、Radha V. Jayaram
DOI:10.1039/c3cy00651d
日期:——
Synthesis of 1,4-dihydropyridines via a four component one pot reaction starting from α,β-unsaturated aldehyde, β-keto ester, amine and alcohol, catalysed by SO42−/CexZr1−xO2 is explored. The method has several advantages such as reusability of catalyst, avoidance of a multistep procedure and readily available starting materials. The protocol gives high to moderate yields for structurally diverse amines, β-keto esters and α,β-unsaturated aldehydes. SO42−/CexZr1−xO2 (x = 0.02–0.15 mol%) catalysts were prepared and characterized by various analytical techniques such as XRD, FT-IR, TGA-DSC, SEM-EDAX and the total acidity.
探索了一种通过四组分一锅反应合成1,4-二氢吡啶的方法,反应起始物为α,β-不饱和醛、β-酮酯、胺和醇,催化剂为SO42−/CexZr1−xO2。该方法具有多个优点,如催化剂可重复使用、避免多步程序以及起始材料容易获得。该协议对结构多样的胺、β-酮酯和α,β-不饱和醛具有高至中等的产率。制备了SO42−/CexZr1−xO2(x = 0.02–0.15 mol%)催化剂,并通过多种分析技术如XRD、FT-IR、TGA-DSC、SEM-EDAX及总酸度进行表征。