Enantioselective Organocatalytic Rearrangement of α-Acyloxy- β-keto Sulfides to α-Acyloxy Thioesters
作者:Francesca Capitta、Angelo Frongia、Pier Paolo Piras、Patrizia Pitzanti、Francesco Secci
DOI:10.1002/adsc.201000376
日期:2010.11.22
The first highly enantioselectiveorganocatalyticrearrangement of α-acyloxy-β-keto sulfides to α-acyloxy thioesters has been developed which provides a number of important synthetic building blocks in high yield and with excellent enantioselectivities (ee: up to 92%).
A facile and efficient protocol for the α-benzoyloxylation of β-keto sulfides is presented. This methodology provides a step-economical, mild and practical access to highly functionalized α-O-benzoyloxy substituted β-keto sulfides, including those with quaternary carbons, which are not easily obtained through currently available methods.
Organocatalytic Isomerization/Allylic Alkylation of <i>O</i>-Acylated Hemithioacetals and Their Application in Tandem Sequence to Access 2,7-Dioxabicyclo[2.2.1]heptan-3-one Derivatives
作者:Huan-Qing Zhang、Ji-Ming Xi、Wei-Wei Liao
DOI:10.1021/acs.joc.9b03172
日期:2020.1.17
preparation of α-hydroxy allylic thioesters via a Lewis base-catalyzed tandem isomerization/allylic alkylationprocess is reported. The resulting allylic thioesters can serve as valuable scaffolds to undergo a stereoselective intramolecular cyclization to deliver 2,7-dioxabicyclo[2.2.1]heptan-3-one derivatives in a catalytically atom-economic fashion.