Metal-free, catalytic regioselective oxidative conversion of vinylarenes: a mild approach to phenylacetic acid derivatives
作者:Srujana Kodumuri、Swamy Peraka、Naresh Mameda、Durgaiah Chevella、Rammurthy Banothu、Narender Nama
DOI:10.1039/c5ra25296b
日期:——
A new synthetic approach towards the synthesis of phenylacetic acids from aromatic alkenes has been developed for the first time under mild conditions by employing non-toxic reagents such as molecular iodine and oxone. This metal-free catalytic regioselective oxygenation of vinylarenes proceeds via tandem iodofunctionalization/de-iodination induced rearrangement.
Methanesulfonamide: a Cosolvent and a General Acid Catalyst in Sharpless Asymmetric Dihydroxylations
作者:Mikko H. Junttila、Osmo O. E. Hormi
DOI:10.1021/jo8026998
日期:2009.4.17
effect on the reaction time and methanesulfonamide effect. The more polar the intermediate osmate ester, the faster is the reaction without methanesulfonamide and the smaller the accelerating methanesulfonamide effect. Methanesulfonamide had no accelerating effect in the asymmetric dihydroxylation of short chain terminal aliphatic olefins as a result of easier accessibility of terminal osmate ester
Liquid‐phase oxidation of olefins with rare hydronium ion salt of dinuclear dioxido‐vanadium(V) complexes and comparative catalytic studies with analogous copper complexes
作者:Abhishek Maurya、Chanchal Haldar
DOI:10.1002/aoc.6203
日期:2021.6
[NsalLH4], respectively). Anionic vanadium and copper complexes 1, 2, 3, and 4 were isolated in the form of their hydronium ion salt, which is rare. The molecular structure of the hydronium ion salt of anionic dinuclear vanadium dioxido complex [(VO2)2(salLH)]− (1) was established through single‐crystal X‐ray analysis. The chemical and structural properties were studied using Fourier transform infrared
An Expedient Procedure for the Oxidative Cleavage of Olefinic Bonds with PhI(OAc)<sub>2</sub>, NMO, and Catalytic OsO<sub>4</sub>
作者:K. C. Nicolaou、Vikrant A. Adsool、Christopher R. H. Hale
DOI:10.1021/ol100290a
日期:2010.4.2
PhI(OAc)2 in the presence of OsO4 (cat.) and 2,6-lutidine cleaves olefinicbonds to yield the corresponding carbonyl compounds, albeit, in some cases, with α-hydroxy ketones as byproduct. A more practical and clean protocol to effect oxidative cleavage of olefinicbonds involves NMO, OsO4 (cat.), 2,6-lutidine, and PhI(OAc)2.
Cyclic Seleninate Esters as Catalysts for the Oxidation of Sulfides to Sulfoxides, Epoxidation of Alkenes, and Conversion of Enamines to α-Hydroxyketones
作者:Eric A. Mercier、Chris D. Smith、Masood Parvez、Thomas G. Back
DOI:10.1021/jo300313v
日期:2012.4.6
sulfides to sulfoxides, alkenes to epoxides, and enamines to α-hydroxyketones. Optimal conditions were found that minimize the overoxidation of the product sulfoxides to sulfones and the hydrolysis of epoxides to diols. In some examples such as styrene derivatives, oxidative cleavage was observed instead of epoxidation. The enamine oxidations proceed via the initial formation of dimeric 2,5-diamino-1