A novel and efficient methodology for the synthesis of 1,2,3-trisubstituted pyrroles by one-pot two-step reaction has been developed. The iodocyclization of a series of β-enamino esters followed by dehydroiodination, led to the formation of corresponding pyrroles. This approach provides an easy access to a wide range of 1,2,3-trisubstituted pyrroles.
Solvent-free iodine-promoted synthesis of 3,2′-pyrrolinyl spirooxindoles from alkylidene oxindoles and enamino esters under ball-milling conditions
作者:Hui Xu、Hong-Wei Liu、Hao-Sheng Lin、Guan-Wu Wang
DOI:10.1039/c7cc08306h
日期:——
A solvent-free mechanochemical reaction of alkylidene oxindoles with enamino esters via an iodine-promoted tandem Michael/cyclization sequence has been developed to provide a variety of spirocyclic oxindoles in moderate to good yields with excellent diastereoselectivities.
β-pyrrolinones from simple amines, alkynes, and α-diazo-β-ketoesters. This approach involving the regioselective C-nucleophilic attack of enamines, uncommon C-nucleophilic addition to ketenes, and umpolung of imines enables the direct synthesis of full-substituted β-pyrrolinones, which were hardly constructed by traditional synthetic strategies.
A new synthetic approach to polyfunctional hexahydropyrrolo[3,4-b]pyrroles was developed based on cyclization of N-arylbromomaleimides with aminocrotonic acid esters. A highly chemo- and stereoselective reaction is a Hantzsch-type domino process, involving the steps of initial nucleophilic C-addition or substitution and subsequent intramolecular nucleophilic addition without recyclyzation of imide
A novel and efficient I2/FeCl3-catalyzed dominoreaction of aurones with enamino esters via Michael addition, iodination, intramolecular nucleophilicsubstitution, and spiro ring opening processes has been developed, affording a vast variety of polysubstituted pyrroles in moderate to excellent yields. This protocol features mild reaction conditions, broad substrate scope, high atom economy and efficiency
已开发出一种新颖且高效的 I 2 /FeCl 3催化的金酮与烯胺酯的多米诺反应,通过迈克尔加成、碘化、分子内亲核取代和螺环开环过程,以中等至优异的收率提供多种多取代吡咯。该方案具有反应条件温和、底物范围广、原子经济性和效率高以及大规模合成的可行性等特点。提出了一种可能的吡咯合成机理。