Stereoselective Access to Fully Substituted Aldehyde‐Derived Silyl Enol Ethers by Iridium‐Catalyzed Alkene Isomerization
作者:Itai Massad、Heiko Sommer、Ilan Marek
DOI:10.1002/anie.202005058
日期:2020.9
An in situ generated cationic Ir‐catalyst isomerizes simple allylic silylethers into valuable, fully substituted aldehyde‐derived silylenolethers. Importantly, by judicious choice of substrate, either of the two possible stereoisomers of a given enolate derivative is accessible with complete stereoselectivity. One‐pot isomerization‐aldol and isomerization‐allylation processes illustrate the synthetic
Stereoselective Sc(OTf)
<sub>3</sub>
‐Catalyzed Aldol Reactions of Disubstituted Silyl Enol Ethers of Aldehydes with Acetals
作者:Peter‐Yong Wang、Itai Massad、Ilan Marek
DOI:10.1002/anie.202101634
日期:2021.6
access to stereodefined disubstituted aldehyde-derived silyl enol ethers allowed their successful application in a stereoselective aldol reaction affording the products with excellent yields and diastereomeric ratios. The counter-intuitive stereochemical behavior of this Mukaiyama-aldol reaction is accounted for by a non-classical open transition state.