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Shedding Light on Organocatalysis—Light‐Assisted Asymmetric Ion‐Pair Catalysis for the Enantioselective Hydrogenation of Pyrylium Ions
Author(s) -
Hsiao ChienChi,
Liao HsuanHung,
Sugiono Erli,
Atodiresei Iuliana,
Rueping Magnus
Publication year - 2013
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201300766
Subject(s) - enantioselective synthesis , organocatalysis , scope (computer science) , catalysis , chemistry , combinatorial chemistry , ion , asymmetric hydrogenation , computer science , nanotechnology , organic chemistry , materials science , programming language
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 4 H ‐chromenes in good yields and with excellent enantioselectivities.