Synthesis of Chromones via Palladium-Catalyzed Ligand-Free Cyclocarbonylation of <i>o</i>-Iodophenols with Terminal Acetylenes in Phosphonium Salt Ionic Liquids
作者:Qian Yang、Howard Alper
DOI:10.1021/jo902210p
日期:2010.2.5
The highly efficient and selective palladium-catalyzed ligand-free cyclocarbonylation reaction of o-iodophenols with terminalacetylenes and CO in the phosphonium salt ionic liquid, C14H29(C6H13)3P+Br−, affords diversified chromones in good to excellent yields under atmospheric CO pressure. The ionic liquid, as the reaction medium, enhances the efficiency of the cyclocarbonylation reaction.
高效和选择性的钯催化的无配体的cyclocarbonylation的反应Ó在鏻盐离子性液体终端乙炔和CO -iodophenols,C 14 H ^ 29(C 6 H ^ 13)3 P +溴- ,得到多样化良好色酮类在常压CO压力下具有出色的产量。作为反应介质的离子液体提高了环羰基化反应的效率。
Metal-free, visible-light-induced C(sp2)-H functionalization/C O bond formation for the synthesis of flavones using air as an oxidant
A green and practical method for synthesizing high value-added flavones from readily available chalcones based on visible-light-induced C(sp2)-H functionalization /CO bondformation is described. This reaction utilizes organic dye (Rose Bengal) as the photosensitizer and atmospheric oxygen as the green oxidant and oxygen source without any metals and external additive requirement. Through this methodology
描述了一种基于可见光诱导的 C(sp 2 )-H 功能化/C O 键形成,从现成的查耳酮合成高附加值黄酮的绿色实用方法。该反应以有机染料(玫瑰红)为光敏剂,大气中的氧气为绿色氧化剂和氧源,无需任何金属和外加剂。通过这种方法,以中等到良好的收率合成了多种黄酮。