FeCl
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‐Catalyzed Formal [3+2] Cyclodimerization of 4‐Carbonyl‐1,2‐diaza‐1,3‐dienes
作者:Giacomo Mari、Matteo Corrieri、Lucia De Crescentini、Gianfranco Favi、Stefania Santeusanio、Fabio Mantellini
DOI:10.1002/ejoc.202101046
日期:2021.10.7
An 1,2-diaza-1,3-diene's cyclodimerization that provides symmetrical fully substituted 1-amino pyrroles through an unusual formal [3+2] reaction is investigated. The study has demonstrated that the presence of electron withdrawing groups on the terminal carbon atom of the azo-ene system is crucial for the success of the reaction. The synthesis occurs with complete regioselectivity and requires a very
Synthesis of Polysubstituted Pyrroles via PhI(OAc)2-Mediated Oxidative Coupling of Enamine Esters and Ketones
作者:Wei Yu、Jun-Yan Wang、Su-Ping Liu
DOI:10.1055/s-0029-1217743
日期:2009.9
Enamine esters or ketones could undergo homocoupling by the action of (diacetoxyiodo)benzene in the presence of BF 3 -OEt 2 , giving rise to pyrrole products. This reaction could be used to synthesize symmetric polysubstituted pyrroles. Some asymmetric polysubstituted pyrroles could also be prepared using this protocol.
benzene to afford the corresponding E-2-phenyliodonio tosylate in good yield. This new alkenyl iodonium salt upon reaction with various nucleophiles offers an easy access to substituted enamine derivatives of crotonic acid. The reaction can be also extended to N-substituted crotonates.
Trifluoroethanol as a Unique Additive for the Chemoselective Electrooxidation of Enamines to Access Unsymmetrically Substituted NH‐Pyrroles
作者:Mrinmay Baidya、Debabrata Maiti、Lisa Roy、Suman De Sarkar
DOI:10.1002/anie.202111679
日期:2022.1.26
A chemoselective electrooxidative heterocoupling of two different enamines is reported for the synthesis of unsymmetricallysubstituted NH-pyrroles. A “magic effect” of the additive trifluoroethanol is utilized to achieve the desired chemoselectivity by tuning the oxidation potentials and controlling the activation energy of the rate-determining step.
Infrared heat aided solid state synthesis of pyrroles from 1,4-diketones and ammonium acetate
作者:Chun Zhang、Jian Wang、Jing-Hua Li
DOI:10.1002/jhet.744
日期:2012.1
A facile amination of 1,4‐diketones with ammoniumacetate has been achieved by mechanochemical grinding assisted by infrared irradiation in the presence of silica gel. The wastes are reduced and the energy resources saved. J. Heterocyclic Chem., (2012).