Palladium-Catalyzed Carbonylation of Aryl, Alkenyl, and Allyl Halides with Phenyl Formate
作者:Tsuyoshi Ueda、Hideyuki Konishi、Kei Manabe
DOI:10.1021/ol301192s
日期:2012.6.15
palladium-catalyzed carbonylation of aryl, alkenyl, and allyl halides with phenyl formate is reported. This procedure does not use carbon monoxide and affords one-carbon-elongated carboxylic acid phenyl esters in excellent yields. The reaction proceeds smoothly under mild conditions and tolerates a wide range of functional groups including aldehyde, ether, ketone, ester, and cyano groups. Furthermore, a variety
decarbonylative C−H coupling of azoles and aromaticesters by palladium catalysis is described. Our previously reported Ni‐catalyzed C−H coupling of azoles and aromaticesters has a significant drawback regarding the substrate scope. Herein, we employ palladium catalysis instead of nickel, resulting in a broader substrate scope in terms of azoles and aromaticesters.
Switchable Selectivity in the Pd-Catalyzed Alkylative Cross-Coupling of Esters
作者:Jeanne Masson-Makdissi、Jaya Kishore Vandavasi、Stephen G. Newman
DOI:10.1021/acs.orglett.8b01646
日期:2018.7.6
The Pd-catalyzed cross-coupling of phenyl esters and alkyl boranes is disclosed. Two reaction modes are rendered accessible in a selective fashion by interchange of the catalyst. With a Pd–NHC system, alkyl ketones can be prepared in good yields via a Suzuki–Miyaurareaction proceeding by activation of the C(acyl)–O bond. Use of a Pd–dcype catalyst enables alkylated arenes to be synthesized by a modified
“Dance reaction” on the aromatic ring is a powerful method in organic chemistry to translocate functional groups on arene scaffolds. Notably, dance reactions of halides and pseudohalides offer a unique platform for the divergent synthesis of substituted (hetero)aromatic compounds when combined with transition-metal-catalyzed coupling reactions. Herein, we report a tandemreaction of ester dance and
A nickel-catalyzed decarbonylative C-H biaryl coupling of azoles and aryl esters is described. The newly developed catalytic system does not require the use of expensive metal catalysts or silver- or copper-based stoichiometric oxidants. We have successfully applied this new C-H arylation reaction to a convergent formal synthesis of muscoride A.