Solvent/Oxidant-Switchable Synthesis of Multisubstituted Quinazolines and Benzimidazoles via Metal-Free Selective Oxidative Annulation of Arylamidines
摘要:
A fast and simple divergent synthesis of multisubstituted quinazolines and benzimidazoles was developed from readily available amidines, via iodine(III)-promoted oxidative C(sp(3))-C(sp(2)) and C(sp(2))-N bond formation in nonpolar and polar solvents, respectively. Further selective synthesis of quinazolines in polar solvent was realized by TEMPO-catalyzed sp(3)C-H/sp(2)C-H direct coupling of the amidine with K2S2O8 as the oxidant. No metal, base, or other additives were needed.
An electrochemical dehydrogenative amination for the synthesis of benzimidazoles was developed. This electrosynthesis method could address the limitations of the C(sp3)–H intramolecularaminationsynthesis reaction and provide novel access to obtain 1,2-disubstituted benzimidazoles without transition metals and oxidants. Under undivided electrolytic conditions, various benzimidazole derivatives could
Design and Syntheses of Ruthenium ENE (E = S, Se) Pincer Complexes: A Versatile System for Catalytic and Biological Applications
作者:Surabhi Bhatt、Neha Meena、Mukesh Kumar、Nattamai Bhuvanesh、Anil Kumar、Anuj K. Sharma、Hemant Joshi
DOI:10.1002/asia.202200736
日期:2022.11.2
Two ruthenium ENE (E = S, Se) pincer complexes were designed and synthesized, and shown to constitute a versatile system for catalytic and biologicalapplications.
设计和合成了两种钌 ENE (E = S, Se) 钳形配合物,并证明它们构成了用于催化和生物应用的多功能系统。