Diverse Oxidative C(sp2)–N Bond Cleavages of Aromatic Fused Imidazoles for Synthesis of α-Ketoamides and N-(pyridin-2-yl)arylamides
摘要:
An efficient and chemoselective C(sp(2))-N bond cleavage of aromatic imidazo[1,2-a]pyridine molecules is developed. A broad scope of amide compounds such as alpha-ketoamides and N-(pyridin-2-yl)arylamides are afforded as the final products in up to quantitative yields. Diverse C-N bond cleavages are controlled by the oxidative species used in this transformation, with various amide products afforded in a chemoselective fashion. A preliminary study indicated that some alpha-ketoamides exhibit anti-Tobacco Mosaic Virus activity for potential use in plant protection.
Diverse Oxidative C(sp2)–N Bond Cleavages of Aromatic Fused Imidazoles for Synthesis of α-Ketoamides and N-(pyridin-2-yl)arylamides
摘要:
An efficient and chemoselective C(sp(2))-N bond cleavage of aromatic imidazo[1,2-a]pyridine molecules is developed. A broad scope of amide compounds such as alpha-ketoamides and N-(pyridin-2-yl)arylamides are afforded as the final products in up to quantitative yields. Diverse C-N bond cleavages are controlled by the oxidative species used in this transformation, with various amide products afforded in a chemoselective fashion. A preliminary study indicated that some alpha-ketoamides exhibit anti-Tobacco Mosaic Virus activity for potential use in plant protection.
Efficient Synthesis of 3-Aminoimidazo[1,2-a] Pyridines Using Silica-Supported Perchloric Acid (HClO4-SiO2) as a Novel Heterogenous Catalyst
作者:Azizollah Habibi、Zahra Tarameshloo、Shahnaz Rostamizadeh、Ali M. Amani
DOI:10.2174/157017812800167439
日期:2012.3.1
An efficient and green protocol for synthesis of 3-aminoimidazo[1,2-a] pyridine derivatives through a three-component reaction of aldehyde, 2-amino pyridine and isocyanide in the presence of silica-supportedperchloricacid (HClO4-SiO2) is described in this paper. The solid catalyst could be recycled and reused.
An Efficient, Regioselective, Versatile Synthesis of N-Fused 2- and 3-Aminoimidazoles via Ugi-Type Multicomponent Reaction Mediated by Zirconium(IV) Chloride in Polyethylene Glycol-400
作者:Sankar Guchhait、Chetna Madaan
DOI:10.1055/s-0028-1087915
日期:2009.3
An Ugi-type multicomponent reaction of heterocyclicamidines with aldehydes and isocyanides catalyzed by zirconium(IV) chloride in PEG-400 was developed. The protocol offers the rapid, environment friendly, regioselective and versatile synthesis of medicinally important N-fused 2- and 3-aminoimidazoles in good to high yields. The combination of catalyst and solvent, that was judiciously explored, was
开发了 PEG-400 中氯化锆 (IV) 催化的杂环脒与醛和异氰化物的 Ugi 型多组分反应。该协议提供了快速、环境友好、区域选择性和多功能的医学上重要的 N-融合 2-和 3-氨基咪唑的合成,产量高。明智地探索了催化剂和溶剂的组合,对于该方法的区域选择性和多功能性至关重要。