期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 139, 期 47, 页码 17186-17192出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b10586
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资金
- NSF [CHE 1665109]
- Institute for Basic Science in Korea [IBS-R10-D1]
- KAIST Presidential Fellowship (KPF)
- NIH [S10 OD020022, S10 OD012245]
- Paul J. Bender fund
- Ministry of Science & ICT (MSIT), Republic of Korea [IBS-R010-D1-2017-A00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Stereochemical control of electronically excited states is a long-standing challenge in photochemical synthesis, and few catalytic systems that produce high enantioselectivities in triplet-state photoreactions are known. We report herein an exceptionally effective chiral photocatalyst that recruits prochiral quinolones using a series of hydrogen-bonding and pi-pi interactions. The organization of these substrates within the chiral, environment of the transition-metal photosensitizer leads to efficient Dexter energy transfer and effective stereoinduction. The relative insensitivity of these organometallic chromophores toward ligand modification enables the optimization of this catalyst structure for high enantiomeric excess at catalyst loadings as much as 100-fold lower than the optimal conditions reported for analogous chiral organic photosensitizers.
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