cinnamaldehydes, anilines and 2-keto esters in methanol. The synthesized compounds were screened for their antidyslipidemic and antioxidant activity in vivo and in vitro. Compounds 2a, 2g, and 2l have exhibited promising lipid and TG lowering activity, whereas compounds 2m and 2n have showed potent antioxidant activity.
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.
An efficient approach for one‐pot three‐component reaction of aromatic amines, α,β‐unsaturated aldehydes and β‐keto esters using magneticnanocrystallineFe3O4 as a catalyst has been described. The corresponding 1,4‐dihydropyridines are obtained in good yields under mild conditions. In addition, the catalyst can be recovered with a magnet and reused at least five consecutive cycles without appreciable
描述了一种使用磁性纳米晶体Fe 3 O 4作为催化剂进行芳族胺,α,β-不饱和醛和β-酮酸酯的单锅三组分反应的有效方法。在温和的条件下,可以良好的收率获得相应的1,4-二氢吡啶。此外,可以用磁体回收催化剂,并至少连续五个循环重复使用,而不会明显降低其催化活性。
Sulfonic Acid Functionalized Silica: An Efficient Heterogeneous Catalyst for a Three-Component Synthesis of 1,4-Dihydropyridines under Solvent-Free Conditions
Sulfonicacidfunctionalized silica catalyzed the three-component reaction of aromatic amines, alpha,beta-unsaturated aldehydes and beta-keto esters forming the corresponding 1,4-dihydropyridines in short reaction times and in high yields.
A new three-component domino synthesis of 1,4-dihydropyridines
作者:Vellaisamy Sridharan、Paramasivan T. Perumal、Carmen Avendaño、J. Carlos Menéndez
DOI:10.1016/j.tet.2007.03.092
日期:2007.5
three-component domino reaction between aromatic amines, α,β-unsaturatedaldehydes, and ethyl acetoacetate, providing an efficient new entry into 1,4-dihydropyridines. This new reaction requires very mild reaction conditions, has water as the only side product and is complementary to the classical Hantzsch synthesis in that it is well suited to the preparation of N-aryl-5,6-unsubstituted dihydropyridines. Experiments