1,1,2,2-Tetrahydroperoxy-1,2-Diphenylethane: An efficient and high oxygen content oxidant in various oxidative reactions
作者:Kaveh Khosravi、Shirin Naserifar
DOI:10.1016/j.tet.2018.09.041
日期:2018.11
Several oxidative approaches namely thiocyanation of aromatic compounds, epoxidation of alkenes, amidation of aromaticaldehydes, epoxidation of α, β-unsaturated ketones, oxidation of sulfides to sulfoxides and sulfones, bayer-villeger reaction, bromination and iodation of aniline and phenol derivatives oxidativeesterification, oxidation of pyridines and oxidation of secondary, allylic and benzyllic
Efficient Transfer of Chelating Amides into Different Types of Esters and Lactones
作者:Uwe Jakob、Stephan Mundinger、Willi Bannwarth
DOI:10.1002/ejoc.201402843
日期:2014.11
corresponding esters despite the fact that the former are thermodynamically more stable. The transformations are mediated by the coordination of CuI by a chelating entity. The resulting weakening of the amide bond allows for nucleophilicattack by alcoholic hydroxyl functions. The principle is demonstrated for a wide variety of transformations, leading to different kinds of esters and lactones.
我们描述了一种将羧酸酰胺转化为其相应酯的通用方法,尽管前者在热力学上更稳定。转化是由螯合实体协调 CuI 介导的。由此产生的酰胺键弱化允许醇羟基官能团进行亲核攻击。该原理适用于各种转化,导致产生不同种类的酯和内酯。
Catalytic Redox Chain Ring Opening of Lactones with Quinones To Synthesize Quinone-Containing Carboxylic Acids
作者:Xiao-Long Xu、Zhi Li
DOI:10.1021/acs.orglett.9b01672
日期:2019.7.5
Catalytic ringopening of five- to eight-membered lactones with quinones is achieved through a redox chain mechanism. With low loading of a simple metal triflate Lewis acid catalyst and a chain initiator, C–H bonds of many quinones were efficiently functionalized with carboxylic acid-containing side chains. This method also features 100% atom economy and wide substrate scope. A novel route to the anti-asthma
N'-dioxide-Sc(III) complex catalysts. The BV oxidations of prochiral cyclohexanones and cyclobutanones afforded series of optically active ε- and γ-lactones, respectively, in up to 99% yield and 95% ee. Meanwhile, the kinetic resolution of racemic 2-arylcyclohexanones was also realized via an abnormal BV oxidation. Enantioenriched 3-aryloxepan-2-ones, whose formation is counter to the migratoryaptitude, were
Last‐minute deal: A directlactonisation of ethers and alcoholsontoamides that proceeds at room temperature under mild conditions is reported (see scheme). This allows the effective saving of up to two unproductive, sequential deprotection operations in synthetic sequences. Mechanistic studies are described, and a new “amidestrategy” that exploits the dual robustness/late‐stage selective activation