Ketones as directing groups in photocatalytic sp(3) C-H fluorination.
Ketones as directing groups in photocatalytic sp(3) C-H fluorination.
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DOI:
10.1039/c7sc02703f
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发表时间:
2017-10-01
期刊:
影响因子:
8.4
通讯作者:
Lectka T
中科院分区:
文献类型:
--
作者:
Bume DD;Pitts CR;Ghorbani F;Harry SA;Capilato JN;Siegler MA;Lectka T
Visible light-sensitization allows conformationally rigid ketones to act as “directing groups” for aliphatic fluorination using Selectfluor, catalytic benzil, and LEDs. The ubiquitous ketone carbonyl group generally deactivates substrates toward radical-based fluorinations, especially sites closest to it. Herein, ketones are used instead to direct aliphatic fluorination using Selectfluor, catalytic benzil, and visible light. Selective β- and γ-fluorination are demonstrated on rigid mono-, di-, tri-, and tetracyclic (steroidal) substrates employing both cyclic and exocyclic aliphatic ketones as directing groups.
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