Visible-light-induced intramolecular charge transfer in the radical spirocyclisation of indole-tethered ynones.
Visible-light-induced intramolecular charge transfer in the radical spirocyclisation of indole-tethered ynones.
复制标题
可见光诱导的分子内电荷转移在吲哚倾斜的YNONE的根本螺旋环境中。
DOI:
10.1039/c9sc05311e
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发表时间:
2019-12-13
期刊:
影响因子:
8.4
通讯作者:
Unsworth WP
中科院分区:
文献类型:
--
作者:
Ho HE;Pagano A;Rossi-Ashton JA;Donald JR;Epton RG;Churchill JC;James MJ;O'Brien P;Taylor RJK;Unsworth WP
Indole-tethered ynones form an intramolecular electron donor–acceptor complex that can undergo visible-light-induced charge transfer to promote thiyl radical generation from thiols. This initiates a novel radical chain sequence, based on dearomatising spirocyclisation with concomitant C–S bond formation. Sulfur-containing spirocycles are formed in high yields using this simple and mild synthetic protocol, in which neither transition metal catalysts nor photocatalysts are required. The proposed mechanism is supported by various mechanistic studies, and the unusual radical initiation mode represents only the second report of the use of an intramolecular electron donor–acceptor complex in synthesis. Indole-tethered ynones form an intramolecular electron donor–acceptor complex that can undergo visible-light-induced charge transfer to promote thiyl radical generation from thiols.
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