Catalytic Formal Benzylic C–H Bond Functionalization of 2,5-Dialkylfuran Derivatives with Ferrocenyl Alcohols as Alkylation Reagents
摘要:
The inert benzylic C-H bond of pi-electron-rich heteroaromatic 2,5-dialkylfuran derivatives was conveniently functionalized with ferrocenyl alcohols as alkylation reagents under catalytic acidic conditions at room temperature, which features chemo- and regiospecificity, mild and metallic catalyst free conditions, and environmental benignity.
A class of polysubstituted functionalized furans was synthesized efficiently starting from readily available furans involving the oxidative ringopening of the furanrings using NBS as an oxidant. The reaction proceeded through a sequence of oxidative dearomatization of the furanring/spirocyclization/aromatization.
leaving group, azide is capable of initiating the generation of a furfuryl cation under the Lewis acid-catalyzed conditions, followed by reacting with the other azide to realize an intermolecular [3 + 2] cycloaddition/furan ring-opening cascade. By extending the reaction time, a fragmentationreaction of resulting furfuryl triazoles occurs to afford 1H-triazoles in high yield. Control studies demonstrated
Catalytic Formal Benzylic C–H Bond Functionalization of 2,5-Dialkylfuran Derivatives with Ferrocenyl Alcohols as Alkylation Reagents
作者:Didi Ren、Lubin Xu、Liang Wang、Shuai-Shuai Li
DOI:10.1021/acs.orglett.8b03701
日期:2019.2.1
The inert benzylic C-H bond of pi-electron-rich heteroaromatic 2,5-dialkylfuran derivatives was conveniently functionalized with ferrocenyl alcohols as alkylation reagents under catalytic acidic conditions at room temperature, which features chemo- and regiospecificity, mild and metallic catalyst free conditions, and environmental benignity.
Interrupted Furan–Yne Cyclization: Access to Unsaturated Dicarbonyl Compounds and Their Subsequent Transformation into Functionalized Pyridazines
作者:Yury A. Vasev、Ekaterina R. Nasibullina、Anton S. Makarov、Maxim G. Uchuskin
DOI:10.1021/acs.orglett.3c02794
日期:2023.11.3
The key carbenoidintermediate of transition-metal-catalyzed furan–yne cyclization in Hashmi phenol synthesis could be efficiently intercepted with water under the developed reaction conditions in order to provide access to functionalized unsaturated dicarbonyl compounds that might serve as convenient precursors for the straightforward synthesis of annulated pyridazines.