Selective palladium-catalyzed carbonylative synthesis of aurones with formic acid as the CO source
作者:Xinxin Qi、Rui Li、Xiao-Feng Wu
DOI:10.1039/c6ra13615j
日期:——
A general and practical strategy has been developed to prepare aurone derivatives. In the presence of the palladium catalyst, 2-iodophenol and terminal alkynes were reacted by using formic acid as the CO source with acetic anhydride as the additive. A variety of aurones were obtained in moderate to good yields. Notably, this is first report on carbonylativesynthesis of aurones with formic acid as
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。
Synthesis of Fully Substituted 5-(<i>o</i>-Hydroxybenzoyl)imidazoles via Iodine-Promoted Domino Reaction of Aurones with Amidines
The reaction proceeds in a consecutive manner containing Michael addition, iodination, cyclization from intramolecular nucleophilic substitution, and dehydrogenative aromatization from spiro ring opening. Following this novel strategy, a variety of 1,2,4-trisubstituted 5-(o-hydroxybenzoyl)imidazoles were efficiently synthesized in moderate to good yields from readily available starting materials. A plausible