Ligand-Controlled Chemoselective C(acyl)–O Bond vs C(aryl)–C Bond Activation of Aromatic Esters in Nickel Catalyzed C(sp<sup>2</sup>)–C(sp<sup>3</sup>) Cross-Couplings
converted into the alkylated arenes and ketone products, respectively. The utility of this newly developed protocol was demonstrated by its wide substrate scope, broad functional group tolerance and application in the synthesis of keyintermediates for the synthesis of bioactive compounds. DFT studies on the oxidative addition step helped rationalizing this intriguing reaction chemoselectivity: whereas
Fluoride anion-initiated bis-trifluoromethylation of phenyl aromatic carboxylates with (trifluoromethyl)trimethylsilane
作者:Kenjiro Takahashi、Yusuke Ano、Naoto Chatani
DOI:10.1039/d0cc04826g
日期:——
carboxylates with (trifluoromethyl)trimethylsilane (Me3SiCF3) that results in the formation of O-silyl-protected 2-aryl-1,1,1,3,3,3-hexafluoroisopropanols is reported. A phenoxide anion, generated during the trifluoromethylation of the phenyl carboxylate, also activates the Me3SiCF3, which permits a catalytic amount of the fluoride anion source to be used. Various functional groups, which can be used for further
Nickel-Catalyzed C–CN Bond Formation via Decarbonylative Cyanation of Esters, Amides, and Intramolecular Recombination Fragment Coupling of Acyl Cyanides
An efficientnickel-catalyzed decarbonylative cyanation reaction which allows the direct functional-group interconversion of readily available esters into the corresponding nitriles was developed. This reaction successfully offers access to structurally diverse nitriles with high efficiency and excellent functional-group tolerance and provides a good alternative to classical synthetic pathways from
N-Heterocyclic carbene catalysed aerobic oxidation of aromatic aldehydes to aryl esters using boronic acids
作者:Panjab Arde、B. T. Ramanjaneyulu、Virsinha Reddy、Apurv Saxena、R. Vijaya Anand
DOI:10.1039/c1ob06566a
日期:——
The organocatalytic behavior of N-heterocyclic carbenes in the aerobicoxidation of aromatic aldehydes to esters with boronic acids has been explored. This transition metal-free protocol allows access to a wide variety of aromatic esters in good to excellent yields under mild reaction conditions.
Direct Esterification of Aromatic Aldehydes with Tetraphenylphosphonium Bromide under Oxidative N-Heterocyclic Carbene Catalysis
作者:Bandaru T. Ramanjaneyulu、Manish Pareek、Virsinha Reddy、R. Vijaya Anand
DOI:10.1002/hlca.201300369
日期:2014.3
An unconventional reagent, tetraphenylphosphonium bromide, was employed as a phenyl source in the direct transformation of aromaticaldehydes to the corresponding phenyl esters under oxidative N‐heterocyclic carbene (NHC) catalysis. The phenyl esters were obtained in moderate yields under mild and organocatalytic conditions.