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。
Silica-supported Perchloric Acid Catalyzed One-pot Synthesis of 1,4-Dihydropyridines
AbstractAn environmentally friendly and highly efficient procedure for the preparation of 1,4‐dihydropyridines by the reaction between α,β‐unsaturated aldehydes, aromatic amines and β‐keto esters in the presence of silica supported perchloric acid is described.
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.