Photoenzymatic Generation of Unstabilized Alkyl Radicals: An Asymmetric Reductive Cyclization.
Photoenzymatic Generation of Unstabilized Alkyl Radicals: An Asymmetric Reductive Cyclization.
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DOI:
10.1021/jacs.0c07918
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发表时间:
2020-09-16
影响因子:
15
通讯作者:
Hyster TK
中科院分区:
文献类型:
--
作者:
Clayman PD;Hyster TK
Flavin-dependent ‘ene’-reductases (ERED) can generate stabilized alkyl radicals when irradiated with visible light, however, they are not known to form unstabilized radicals. Here, we report an enantioselective radical cyclization using alkyl iodides as precursors to unstabilized nucleophilic radicals. Evidence suggests this species is accessed by photoexcitation of a charge-transfer complex that forms between flavin and substrate within the protein active site. Stereoselective delivery of a hydrogen atom from the flavin semiquinone to the prochiral radical formed after cyclization provides high levels of enantioselectivity across a variety of substrates. Overall, this transformation demonstrates that photoenzymatic catalysis can address long-standing selectivity challenges in the radical literature.
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