Abstract
A new light-driven asymmetric ion-pair catalysis procedure for the metal-free enantioselective hydrogenation of in situ generated pyrylium ions from readily available chalcones was developed (see scheme). The photo-assisted Brønsted acid catalyzed procedure has broad scope and allows, for the first time, access to valuable 4H-chromenes in good yields and with excellent enantioselectivities.
Original language | English (US) |
---|---|
Pages (from-to) | 9775-9779 |
Number of pages | 5 |
Journal | Chemistry - A European Journal |
Volume | 19 |
Issue number | 30 |
DOIs | |
State | Published - Jul 22 2013 |
Externally published | Yes |
Keywords
- asymmetric catalysis
- benzopyrane
- chiral ion pair
- oxocarbenium ion
- reduction
ASJC Scopus subject areas
- Catalysis
- Organic Chemistry