Skeletal Diverse Synthesis of N-Fused Polycyclic Heterocycles via the Sequence of Ugi-Type MCR and CuI-Catalyzed Coupling/Tandem Pictet–Spengler Reaction
摘要:
Several diversity-oriented syntheses of N-fused polycyclic heterocycles have been demonstrated but most of them are based on point diversity within the same library and usually involve time-consuming sequential multistep syntheses, which also suffer from low yields and/or poor precursor scopes. We have developed a new strategy for the syntheses of skeletal diverse N-fused polycyclic compounds via an Ugi-type MCR followed by a CuI-catalyzed coupling reaction or tandem Pictet-Spengler reaction. This two-step sequence provides eight distinct skeleton of fused {6-5-5-6}, {5-5-5-6}, {6-5-6-6}, and {5-5-6-6} ring systems that have applications in medicinal chemistry and chemical genetics too.
In this study, first biocatalytic synthesis of clinically important imidazo[1,2- a]pyridine based compounds has been achieved. The Candida antarctica lipase B (CALB) enzyme was found suitable to catalyze the Groebke-Blackburn-Bienaymé (GBB) multicomponent reaction of substituted 2-aminopyridine, benzaldehyde and isocyanides to synthesize imidazo[1,2-a]pyridine derivatives in very good yields. Further
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
Fluorescent annulated imidazo[4,5-<i>c</i>]isoquinolines <i>via</i> a GBB-3CR/imidoylation sequence – DNA-interactions in pUC-19 gel electrophoresis mobility shift assay
作者:M. Stahlberger、O. Steinlein、C. R. Adam、M. Rotter、J. Hohmann、M. Nieger、B. Köberle、S. Bräse
DOI:10.1039/d2ob00372d
日期:——
Herein we report the development of a sequential synthesis route towards annulated imidazo[4,5-c]isoquinolines comprising a GBB-3CR, followed by an intramolecular imidoylative cyclisation. X-Ray crystallography revealed a flat 3D structure of the obtained polyheterocycles. Thus, we evaluated their interactions with double-stranded DNA by establishing a pUC-19 plasmid-based gel electrophoresis mobility
在本文中,我们报告了针对包含 GBB-3CR 的环化咪唑并[4,5 - c ] 异喹啉的顺序合成路线的开发,然后是分子内酰亚胺化环化。X 射线晶体学揭示了所得多杂环的平坦 3D 结构。因此,我们通过建立基于 pUC-19 质粒的凝胶电泳迁移率变化分析来评估它们与双链 DNA 的相互作用,揭示了 ds-DNA 对链断裂诱导条件的稳定作用。
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