Atom-Efficient Metal-Catalyzed Cross-Coupling Reaction of Indium Organometallics with Organic Electrophiles
作者:Ignacio Pérez、José Pérez Sestelo、Luis A. Sarandeses
DOI:10.1021/ja004195m
日期:2001.5.1
The novel metal-catalyzed cross-coupling reaction of indium organometallics with organic electrophiles is described. Triorganoindiumcompounds (R(3)In) containing alkyl, vinyl, aryl, and alkynyl groups are efficiently prepared from the corresponding lithium or magnesium organometallics by reaction with indium trichloride. The cross-coupling reaction of R(3)In with aryl halides and pseudohalides (iodide
susceptibility of the unsaturated C-C bonds adjacent to the carbonyl group toward Pd catalysts makes the direct conversion of α, β-unsaturated derivatives as acyl electrophiles to cross-conjugated ketones rare. This work presents a highly selective C-O activation approach to prepare cross-conjugated enynones using α, β-unsaturated triazine esters as acyl electrophiles. Under base and phosphine ligand-free
Palladium-catalyzed acylation and/or homo-coupling of aryl- and alkyl-acetylenes
作者:Serena Perrone、Fabio Bona、Luigino Troisi
DOI:10.1016/j.tet.2011.07.032
日期:2011.9
Allyl or benzyl halides, through a Pd(0)-catalyzed reaction and under CO pressure, generate acyl-palladium/halides that, in the presence of a base and an aryl- and alkyl-acetylene, undergo nucleophilic acyl substitution giving conjugated acetylenic ketones. Diynes, resulting from allcyne/alkyne homo-coupling, were instead the main products in reactions performed without allyl or benzyl halides. Moreover, dimerization, trimerization, and cyclotrimerization reactions of acetylenes were observed in reaction carried out even without base. (C) 2011 Elsevier Ltd. All rights reserved.
Palladium-Catalyzed Regio- and Stereoselective Cross-Addition of Terminal Alkynes to Ynol Ethers and Synthesis of 1,4-Enyn-3-ones
作者:Madala Hari Babu、Vikas Dwivedi、Ruchir Kant、Maddi Sridhar Reddy
DOI:10.1002/anie.201411261
日期:2015.3.16
Conjugated enynes, enol ethers, and enynones are versatile building blocks that can be elaborated by a wide variety of synthetic transformations. The selective synthesis of such units is a prerequisite for their effective utilization. The synthesis of conjugated 2‐phenoxyenynes through a palladium‐catalyzed cross‐addition of terminal alkynes to phenylethynyl ethers (hydroalkynylation) is now presented