期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 137, 期 35, 页码 11254-11257出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b07136
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资金
- WWU Munster
- Deutsche Forschungsgemeinschaft [SFB 858]
- Deutsche Forschungsgemeinschaft (Excellence Cluster) [EXC 1003]
- Fonds der Chemischen Industrie (FCI)
Herein, Nature's flavin-mediated activation of complex (poly)enes has been translated to a small molecule paradigm culminating in a highly (Z)-selective, catalytic isomerization of activated olefins using (-)-ribo-flavin (up to 99:1 Z/E). In contrast to the prominent Z -> E isomerization of the natural system, it was possible to invert the directionality of the isomerization (E -> Z) by simultaneously truncating the retinal scaffold, and introducing a third olefin substituent to augment A1,3-strain upon isomerization. Consequently, conjugation is reduced in the product chromophore leading to a substrate/product combination with discrete photophysical signatures. The operationally simple isomerization protocol has been applied to a variety of enone-derived substrates and showcased in the preparation of the medically relevant 4-substituted coumarin scaffold. A correlation of sensitizer triplet energy (ET) and reaction efficiency, together with the study of additive effects and mechanistic probes, is consistent with a triplet energy transfer mechanism.
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