Mechanistic studies of DCC/HOBt-mediated reaction of 3-phenylpropionic acid with benzyl alcohol and studies on the reactivities of ‘active ester’ and the related derivatives with nucleophiles
extensive study for peptide synthesis, DCC-mediated esterification is left still unclear. Therefore, DCC- and DCC/HOBt-mediated reactions of 3-phenylpropionic acid (1) with benzyl alcohol were carried out under several mechanistic considerations. Further, in order to determine the reactivities of the so-called ‘active esters’ compounds changing the substituents bearing carbonyl and relatedderivatives group
Catalyticα‐alkylation of esters with primary alcohols is a desirable process because it uses low‐toxicity agents and generates water as the by‐product. Reported herein is a NCP pincer/Ir catalyst which is highlyefficient for α‐alkylation of a broad scope of unactivated esters under mild reaction conditions. For the first time, alcohols alkylate unactivated α‐substituted acyclic esters, lactones,
Umpolung reactions in an ionic liquid catalyzed by electrogenerated N-heterocyclic carbenes. Synthesis of saturated esters from activated α,β-unsaturated aldehydes
The umpolung reaction of alpha,beta-unsaturated aldehydes to saturated esters has been carried out in an ionic liquid by organocatalysis of electrogenerated NHC. The roles of solvent, precatalyst and proton donor of the ionic liquid have been verified and good to high yields of esters have been obtained using a "green" and mild methodology.
Lipase-catalyzed esterification in water enabled by nanomicelles. Applications to 1-pot multi-step sequences
作者:Vani Singhania、Margery Cortes-Clerget、Jade Dussart-Gautheret、Bhornrawin Akkachairin、Julie Yu、Nnamdi Akporji、Fabrice Gallou、Bruce H. Lipshutz
DOI:10.1039/d1sc05660c
日期:——
Esterification in an aqueous micellar medium is catalyzed by a commerciallyavailable lipase in the absence of any co-factors. The presence of only 2 wt% designer surfactant, TPGS-750-M, assists in a 100% selective enzymatic process in which only primary alcohols participate (in a 1 : 1 ratio with carboxylic acid). An unexpected finding is also disclosed where the simple additive, PhCF3 (1 equiv. vs
Visible‐Light‐Promoted Catalyst‐Free Oxyarylation and Hydroarylation of Alkenes with Carbon Dioxide Radical Anion
作者:Jing Hou、Li‐Li Hua、Yan Huang、Le‐Wu Zhan、Bin‐Dong Li
DOI:10.1002/asia.202201092
日期:2023.1.3
Visible-light-mediated oxyarylation and hydroarylation of alkenes with aryl halides using formate salts as the reductant and hydrogen source under ambient conditions were developed. The protocol represents a rare catalyst-free example of the realization of such transformations.