Enantioselective photochemistry through Lewis acid-catalyzed triplet energy transfer.
Enantioselective photochemistry through Lewis acid-catalyzed triplet energy transfer.
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DOI:
10.1126/science.aai8228
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发表时间:
2016-12-16
期刊:
影响因子:
--
通讯作者:
Yoon TP
中科院分区:
文献类型:
--
作者:
Blum TR;Miller ZD;Bates DM;Guzei IA;Yoon TP
Relatively few catalytic systems are able to control the stereochemistry of electronically excited organic intermediates. Here we report the discovery that a chiral Lewis acid complex can catalyze triplet energy transfer from an electronically excited photosensitizer. This strategy is applied to asymmetric [2+2] photocycloadditions of 2′-hydroxychalcones using tris(bipyridyl) ruthenium(II) as a sensitizer. A variety of electrochemical, computational, and spectroscopic data rule out substrate activation via photoinduced electron transfer and instead support a mechanism in which Lewis acid coordination dramatically lowers the triplet energy of the chalcone substrate. We expect that this approach will enable chemists to more broadly apply their detailed understanding of chiral Lewis acid catalysis to stereocontrol in reactions of electronically excited states.
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