Synthesis of Polyheteroaromatic Compounds via Rhodium-Catalyzed Multiple C–H Bond Activation and Oxidative Annulation
作者:Shiyong Peng、Suna Liu、Sai Zhang、Shengyu Cao、Jiangtao Sun
DOI:10.1021/acs.orglett.5b02510
日期:2015.10.16
Transition-metal-catalyzed multiple C–Hactivation and sequential oxidative annulation allows rapidly assembling of those compounds from readily available starting materials. A rhodium-catalyzed cascade oxidative annulation of β-enamino esters or 4-aminocoumarins with internal alkynes is described to access those compounds, featuring multiple C–H/N–H bond cleavages and sequential C–C/C–N bond formations in one pot
Palladium-Catalyzed Oxidative Annulation<i>via</i>CH/NH Functionalization: Access to Substituted Pyrroles
作者:Shiyong Peng、Lei Wang、Jiayao Huang、Shaofa Sun、Haibing Guo、Jian Wang
DOI:10.1002/adsc.201300512
日期:2013.9.16
Pyrroles, ubiquitous bioactive heterocycles in nature, are readily prepared via a palladium‐catalyzedoxidative annulation of cyclic trans‐enamines to various internal alkynes in the absence of a directing group.
Acetic acid promoted an efficient and eco-friendly one-pot synthesis of functionalized novel isoxazolyl amino chromenopyrrole derivatives in aqueous medium
作者:Nallamothu Vanaja Rani、Ravindhranath Kunta
DOI:10.1080/00397911.2020.1846058
日期:2021.2.16
An efficient, economical, and environmentally friendly method has been reported for one-potsynthesis of isoxazolyl amino chromenopyrrole derivativesfrom 4-amino-3-methyl-5-styrylisoxazoles, aryl ...
An effective tandem reaction of 4-aminocoumarins and 1,3-diarylpropenes mediated by Cu(OTf)2/TBHP (tert-butyl hydroperoxide)/O2 that provides various benzopyrano[4,3-b]pyridines in moderate to good yields is disclosed. The reaction proceeds through oxidative coupling, intramolecular cyclization, and dehydro-aromatization. This approach has the advantages of high atom-economy, environmental compatibility
Efficient Cu(OTf) 2 -catalyzed and microwave-assisted rapid synthesis of 3,4-fused chromenopyridinones under neat conditions
作者:Anubha Yadav、Soumen Biswas、Shaikh M. Mobin、Sampak Samanta
DOI:10.1016/j.tetlet.2017.08.006
日期:2017.9
An efficient, solvent-free, environmentally benign, Cu(OTf)(2)-catalyzed and microwave-assisted fast synthesis of a fascinating class of a number of angularly fused chromenopyridinones having a carboxylate group at C-2 position on the pyridine ring via a one-pot [3+3] annulation reaction of several aminocoumarins/cyclic beta-enaminones with different kinds of gamma-aryI/styryI/heteroaryl-substituted-beta,gamma-unsaturated alpha-ketoesters as Michael acceptors under open atmosphere. This eco-friendly method delivers good to excellent yields of pyridine-fused-heterocycles within (15-40 min) without using any traditional oxidants and allows several important functionalities. Furthermore, by this method, stereos elective synthesis of trans-7,8-diaryl-8.9-dihydrochromeno[4,3-b]cyclopenta[e]pyridine-6,10-diones were obtained in an excellent diastereoselective manner (dr <= 99:1). (C) 2017 Elsevier Ltd. All rights reserved.