A Kinetic Study on Aminolysis of 2-Pyridyl X-Substituted Benzoates: Effect of Changing Leaving Group from 4-Nitrophenolate to 2-Pyridinolate on Reactivity and Mechanism
Transesterification of (hetero)aryl esters with phenols by an Earth-abundant metal catalyst
作者:Jianxia Chen、E. Namila、Chaolumen Bai、Menghe Baiyin、Bao Agula、Yong-Sheng Bao
DOI:10.1039/c8ra04984j
日期:——
for the transesterification of aryl or heteroaryl esters with phenols which is a challenging and underdeveloped transformation. The simple conditions and the use of heterogeneous alkali metal catalyst make this protocol very environmentally friendly and practical. This reaction fills in the missing part in transesterification reaction of phenols and provides an efficient approach to aryl esters, which
Heterogeneous Suzuki–Miyaura coupling of heteroaryl ester <i>via</i> chemoselective C(acyl)–O bond activation
作者:Hongpeng Ma、Chaolumen Bai、Yong-Sheng Bao
DOI:10.1039/c9ra02394a
日期:——
A site-selective supported palladium nanoparticle catalyzed Suzuki–Miyaura cross-coupling reaction with heteroaryl esters and arylboronic acids as coupling partners was developed. This methodology provides a heterogeneous catalytic route for aryl ketone formation via C(acyl)–O bond activation of esters by successful suppression of the undesired decarbonylation phenomenon. The catalyst can be reused
Comparison of Aminolysis of 2-Pyridyl and 4-Pyridyl X-Substituted Benzoates in Acetonitrile: Evidence for a Concerted Mechanism Involving a Cyclic Transition State
作者:Ik-Hwan Um、Ae-Ri Bae、Tae-Il Um
DOI:10.1021/jo402629e
日期:2014.2.7
but rather by resonance stabilization of substrates possessing an electron-donating group (EDG) in the benzoyl moiety. The Brønsted-type plots are linear with βnuc = 0.59 ± 0.02, which is typical of reactions reported to proceed through a concerted mechanism. A cyclic transition state (TS), which forces the reaction to proceed through a concerted mechanism, is proposed. The deuterium kinetic isotope
A photoredox-assisted reductiveacyl cross-coupling reaction of two different carboxylic acid esters was developed for ketone synthesis. The reaction proceeded smoothly under mild conditions using Hantzsch ester (HE) as an organic reductant, with high chemoselectivity and functional group compatibility. A large range of aryl and 1°, 2°, 3°-acyl electrophiles, and 1°, 2°, 3°-alkyl radical precursors
Nickel-Catalyzed Three-Component Alkylacylation of Alkenes Enabled by a Photoactive Electron Donor–Acceptor Complex
作者:Xiaoxiang Xi、Yukun Chen、Weiming Yuan
DOI:10.1021/acs.orglett.2c01237
日期:2022.6.10
An electron donor–acceptor complex-enabled, nickel-catalyzed three-component net-reductive 1,2-alkylacylation of alkenes is developed. This conjunctive reductive acyl cross-coupling process obviates the use of an exogenous photocatalyst and a stoichiometric metal-based reductant, affording various synthetically useful 1,3-dicarbonylcompounds in good yields with a broad substrate scope and excellent