Covalently Anchored Sulfonic Acid on Silica Gel as an Efficient and Reusable Heterogeneous Catalyst for the One-Pot Synthesis of Hantzsch 1,4-Dihydropyridines under Solvent-Free Conditions
作者:Satya Paul、Raman Gupta、Rajive Gupta、Andre Loupy
DOI:10.1055/s-2007-983839
日期:2007.9
A highly efficient one-pot synthesis of Hantzsch 1,4-dihydropyridines under solvent-free conditions catalyzed by sulfonic acid covalently anchored onto the surface of silica gel is reported here. All types of aldehydes, including aromatic, unsaturated, and heterocyclic aldehydes, gave excellent yields. The silica gel/sulfonic acid catalyst (SiO 2 -SO 3 H) is completely heterogeneous and can be recycled
本文报道了在无溶剂条件下由共价锚定在硅胶表面的磺酸催化的 Hantzsch 1,4-二氢吡啶的高效一锅法合成。所有类型的醛,包括芳香醛、不饱和醛和杂环醛,都得到了优异的收率。硅胶/磺酸催化剂 (SiO 2 -SO 3 H) 是完全非均相的,可以连续 8 次循环使用而不会显着降低活性。