Ruthenium(II)-Catalyzed Cyclization of Aromatic Acids with Allylic Acetates via Redox-Free Two-Fold Aromatic/Allylic C–H Activations: Combined Experimental and DFT Studies
A Ru(II)-catalyzed, redox-free, two-fold aromatic/allylic C–H bond activation of aromatic acids with allylic acetates to give (Z)-3-ylidenephthalides is described. In the reaction, H2 was formed as a side product. The detailed mechanistic investigation and DFT studies including the transition-state analysis support the postulate that the C–H allylation takes place at the ortho position of aromatic
A facile route to 3,7-cis-disubstituted cycloocta-1,5-diene-1,2,5,6- tetracarboxylates through photochemical [2 + 2]cycloaddition of 3-substituted cyclobutene-1,2-dicarboxylates and thermal isomerization†
Photochemical dimerization of 3-substituted cyclobutene-1,2-dicarboxylates followed by thermal isomerization gives regio- and stereo-selectively 3,7-cis-disubstituted cycloocta-1,5-diene-1,2,5,6-tetracarboxylates.
Highly Regio- and Stereoselective Heck Reaction of Allylic Esters with Arenediazonium Salts: Application to the Synthesis of Kavalactones
作者:Angélica Venturini Moro、Flávio Sega Pereira Cardoso、Carlos Roque Duarte Correia
DOI:10.1021/ol901416e
日期:2009.8.20
highly efficient palladium-catalyzed Heck reaction of allylic esters with arenediazoniumsalts is described. The reaction proceeds under mild conditions, with excellent to total regio- and stereochemical control and with retention of the traditional leaving group. Furthermore, the generality of the present methodology is illustrated by the short total synthesis of the natural kavalactones, yangonine,
Carboxylic Acid Promoted, Redox‐Neutral Ru‐Catalyzed C−H Allylation of Aromatic Ketones
作者:Dattatraya H. Dethe、Nagabhushana C. Beeralingappa、Balu D. Dherange
DOI:10.1002/ejoc.202100717
日期:2021.9.7
ketone-directed C(sp2)−H allylation of aromatic ketones such as substituted acetophenones, 3-acetyl indoles, and chalcones was developed under redox-neutral conditions. 1-Adamantane carboxylic acid plays a crucial role in improving the reactivity of the [RuCl2(p-cymene)]2 catalyst at mild reaction temperatures. This method provides an access to various synthetically useful terminalolefin systems in moderate to good
Substituted aromaticketoximes reacted efficiently with allylicacetates in the presence of [RuCl2(p‐cymene)]2} and AgSbF6 in 1,2‐dichloroethane at ambient temperature, providing ortho‐allyl aromaticketoximes in a highly regioselective manner without an oxidant. In the reaction, the acetate group of allyl acetate acts as a base to activate the CH bond of aromatics. Later, ortho‐allyl aromatic ketoximes