Highly Regio- and Stereoselective Ring-Opening Reaction of γ-Alkenyl-γ-butyrolactones with Allylsilanes in the Presence of Trimethyloxonium Salt Leading to Methyl 4,8-Alkadienoates
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
[EN] KETAL ESTERS OF ANHYDROPENTITOLS AND USES THEREOF<br/>[FR] CÉTO-ESTERS D'ANHYDROPENTITOLS ET LEURS UTILISATIONS
申请人:XLTERRA INC
公开号:WO2010138842A1
公开(公告)日:2010-12-02
The present disclosure relates to the preparation of ketal compounds from anhydropentitols and oxocarboxylates; derivatives, homopolymers, and copolymers thereof; and various compositions, formulations, and articles derived therefrom.
collective synthesis of medium‐sized methylene lactones via controlled cyclizations of easily accessible collective precursors is described. The rapid composition of key–hydroxyalkenoic acid scaffold yields an assembly of oxocanones, oxepanones, and pyranones in a regioselective and stereodirected fashion via palladium‐catalyzedcyclization.
Deuterated analogues of α- and γ-CEHC, main urinary and plasma metabolites of vitaminE, can be traced and accurately determined quantitatively by MS in complex matrices. In that regard, here we report the first synthesis of rac-[D3]-γ-CEHC together with a simple route to 7a,8a-[D2]-γ-CEHC through the set up of efficient procedures for the preparation of the corresponding deuterated hydroquinone building
Pyridinium chlorochromate (PCC) has been found to be selective reagent for the oxidative cleavage of enol ethers to esters or keto lactones in high yields.