Formation of Chiral Allylic Ethers via an Enantioselective Palladium-Catalyzed Alkenylation of Acyclic Enol Ethers
作者:Harshkumar H. Patel、Matthew B. Prater、Scott O. Squire、Matthew S. Sigman
DOI:10.1021/jacs.8b02751
日期:2018.5.9
palladium-catalyzed process to access highly functionalized, optically active allylic aryl ethers. A number of electron-deficient alkenyl triflates underwent enantioselective and site-selective coupling with acyclic aryl enol ethers in the presence of a chiral palladium catalyst. This transform provides chiral allylicether products in high yields and excellent enantiomeric ratios, furnishing a unique
Palladium-Catalyzed Enantioselective Heck Alkenylation of Acyclic Alkenols Using a Redox-Relay Strategy
作者:Harshkumar H. Patel、Matthew S. Sigman
DOI:10.1021/ja5130836
日期:2015.3.18
carbonyl group in high enantioselectivity. The success of this reaction is attributed to the use of electron-withdrawing alkenyl triflates, which offer selective β-hydride elimination followed by migration of the catalyst through the alkyl chain to give the alkenylated carbonyl products. The synthetic utility of the process is demonstrated by a two-step modification of a reaction product to yield a tricyclic
Palladium‐Catalyzed Enantioselective Alkenylation of Enelactams Using a Relay Heck Strategy
作者:Qianjia Yuan、Matthew S. Sigman
DOI:10.1002/chem.201902813
日期:2019.8.14
In this report, a palladium-catalyzed redox-relay Heck process to access optically active alkenylated α,β-unsaturated lactams is described. Under mildreaction conditions, electron-deficient alkenyl triflates and electron-rich alkenyliodoniumsalts undergo enantioselective and site-selective coupling with enelactams to deliver the products in high yields and excellent enantioselectivities. Furthermore
Investigating Direct Access to 2-Oxospiro[4.5]decanones via 6π-Electrocyclisation
作者:Rebecca H. Pouwer、Heiko Schill、Craig M. Williams、Paul V. Bernhardt
DOI:10.1002/ejoc.200700367
日期:2007.10
The 2-oxospiro[4.5]decan-1-one (or spiro-γ-lactone) structural motif is contained within a number of natural products, for example, the clerodane family of diterpenes. Methods to construct this structural motif are somewhat limited and usually involve multiple functional group interconversions. A novel synthetic approach to this system utilising 6π-electrocyclisation has been identified and associated
Enantioselective Synthesis of γ‐Functionalized Cyclopentenones and δ‐Functionalized Cycloheptenones Utilizing a Redox‐Relay Heck Strategy
作者:Qianjia Yuan、Matthew B. Prater、Matthew S. Sigman
DOI:10.1002/adsc.201901239
日期:2020.1.23
In this report, the desymmetrization of cyclic enones under relay Heck conditions with an array of aryl boronic acids, alkenyl triflates and indole derivatives is described. This method grants facile access to diverse γ‐functionalized cyclopentenones and δ‐functionalized cycloheptenones. Using this approach, a formal synthesis of (S)‐baclofen was completed in high yield and excellent enantioselectivity