Palladium catalysed queuing processes. Part 1: Termolecular cyclization–anion capture employing carbon monoxide as a relay switch and hydride, organotin(IV) or boron reagents
作者:Stephen Brown、Stephen Clarkson、Ronald Grigg、W.Anthony Thomas、Visuvanathar Sridharan、D.M Wilson
DOI:10.1016/s0040-4020(00)01103-0
日期:2001.2
enhance the scope of our cyclization–anion capture methodology, is introduced and exemplified by a wide variety of catalytic cyclization–carbonylation–anion capture processes employing hydride, organostannanes and NaBPh4 as anion capture agents. Mono- and bis-cyclization processes forming 5- and 6-membered rings are described, all of which employ CO at atmospheric pressure. Cyclocarboformylation processes
Palladium(II)-catalyzed intramolecular addition of arylboronic acids to ketones
作者:Guixia Liu、Xiyan Lu
DOI:10.1016/j.tet.2008.05.056
日期:2008.7
A palladium(II)-catalyzed intramolecular addition of arylboronic acids to ketones was developed. Compared to Pd(OAc)2 catalysis system, cationic palladium complex with dppp as the ligand has higher catalytic activity and efficiency for wider scope of substrates. From this reaction, the normal addition product or the dehydrated product could be selectively furnished as controlled by additives. Highly
An intramolecular annulation strategy has been developed for the synthesis of fluoroalkylated indane-type analogs. The difluoromethyl and trifluoromethyl functional motifs could be derived from gem-difluoroalkenes through this palladium-catalyzed reaction. This method is also extendable to other fluoroalkenes and multi-component reactions.
Palladium‐Catalyzed Defluorinative Coupling of Difluoroalkenes and Aryl Boronic Acids for Ketone Synthesis
作者:Guangwu Sun、Herui Liu、Xiu Wang、Wenbo Zhang、Wenjun Miao、Qinyu Luo、Bing Gao、Jinbo Hu
DOI:10.1002/anie.202213646
日期:2023.1.2
A palladium-catalyzed defluorinative coupling reaction of gem-difluoroalkenes and arylboronicacids affords ketones with an α-all-carbon quaternary center. The vinyl difluoromethylene motif serves as an in situ carbonyl precursor that is unprecedented in transition-metal-catalyzed coupling reactions. The key difluoroalkyl palladium(II) RCF2−PdII intermediate and related organometallic species were
钯催化的偕二氟烯烃和芳基硼酸的脱氟偶联反应提供了具有 α-全碳季中心的酮。乙烯基二氟亚甲基基序用作原位羰基前体,这在过渡金属催化的偶联反应中是前所未有的。关键的二氟烷基钯 (II) RCF 2 -Pd II中间体和相关的有机金属物种得到了充分表征。