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.
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。
Synthesis of quaternary succinimides promoted by Ferric Nitrate
synthesis of quaternary α-aminosuccinimides in toluene medium involving 2-phenylimidazo[1, 2-a]pyridine in a one-pot reaction promoted by FerricNitrate at 120 °C. The protocol presented herein, is for the first time, via a novel transformation where FerricNitrate promotes imidazo[1,2-a]pyridine structural metamorphosis to the title compound quaternary succinimides. High compatibility, easy work-up
Synthesis of functionalized 3-amino-pyrrolidine-2,5-diones through an aliphatic acid silver mediated oxidative post-GBB modification reaction
作者:Xiang Wang、Yue Sun、Meng-Yuan Wang、Jing-Ru Zou、Zeng-Yun Tian、Lei-Ming Huo、Xin-Gang Xie、Guo-Xin Wang、Xing Huo
DOI:10.1016/j.tet.2024.133876
日期:2024.3
The efficient synthesis of a range of biologically significant functionalized 3-aminopyrrolidine-2,5-dione derivatives was achieved from -fused imidazole derivatives (GBB(Groebke-Blackburn-Bienaymé) reaction products) through structural rearrangement by the treatment of aliphatic acid silver salt. The reaction features wide substrates scope, exceptionally mild conditions, moderate-to-good yields and