Sulfamate Esters Guide Selective Radical-Mediated Chlorination of Aliphatic C-H Bonds.
Sulfamate Esters Guide Selective Radical-Mediated Chlorination of Aliphatic C-H Bonds.
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DOI:
10.1002/anie.201710322
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发表时间:
2018-01-02
期刊:
影响因子:
--
通讯作者:
Roizen JL
中科院分区:
文献类型:
--
作者:
Short MA;Blackburn JM;Roizen JL
Masked alcohols are particularly appealing as directing groups because of the ubiquity of hydroxyl groups in organic small molecules. Herein, we disclose a general strategy for aliphatic γ-C(sp3)–H functionalization guided by a masked alcohol. Specifically, we determine that sulfamate ester-derived nitrogen-centered radicals mediate 1,6-hydrogen-atom transfer (HAT) processes to guide γ-C(sp3)–H chlorination. This reaction proceeds through a light-initiated radical chain-propagation process and is capable of installing chlorine atoms at primary, secondary, and tertiary centers. Guided Chlorination: Aliphatic γ-C(sp3)–H chlorination is directed by a sulfamate-ester masked alcohol. This reaction involves a light-initiated N–Cl bond homolysis, followed by an unusual radical-mediated 1,6-hydrogen-atom abstraction with subsequent chlorination enabled by a chain-propagation process. Through this process, chlorine atoms can be selectively installed at primary, secondary, and tertiary centers with predictable selectivity.
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