In memory of Professor Dieter Enders
Published as part of the ISySyCat2019 Special Issue
Abstract
In the reactions of simple starting materials, precise catalytic control of the stereochemical
outcome (enantio- and diastereoselectivity), as well as chemoselectivity and regioselectivity
is an efficient approach to increase molecular complexity with minimal use of protecting
groups. Here, we introduce our ongoing studies on asymmetric catalytic reactions using
α-keto esters as pronucleophiles or formal 1,3-dipolarophiles. Capitalizing on the
high tunability of our late transition-metal complexes with a suitable basic counteranion,
we have established a range of multiselective catalytic protocols starting from α-keto
esters to provide a wide variety of stereochemically complex molecules incorporating
adjacent stereocenters.
1 Introduction
2 Catalytic Asymmetric Monofluorination with NSFI
3 Catalytic Asymmetric Michael Reaction with Nitroolefins
4 Catalytic Asymmetric [3+2] Cycloaddition with (E)-Nitrones
5 Catalytic Asymmetric [3+2] Cycloaddition with Nitrile Oxides
6 Summary
Key words
α-keto esters - enolates - chemoselectivity - stereoselectivity - regioselectivity
- transition metals - asymmetric catalysis - nucleophilic addition