Photochemically Induced Intramolecular Radical Cyclization Reactions with Imines

Photochemically Induced Intramolecular Radical Cyclization Reactions with Imines
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光化学诱导的亚胺分子内自由基环化反应

DOI:
10.1021/acs.joc.7b02810
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发表时间:
2018
期刊:
The Journal of Organic Chemistry
影响因子:
--
通讯作者:
Hoffmann Norbert
Hoffmann Norbert
中科院分区:
--
文献类型:
--
作者:
Lefebvre Corentin;Michelin Clment;Martzel Thomas;Djou’ou Mvondo Vaneck;Bulach Vronique;Abe Manabu;Hoffmann Norbert

文献摘要

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研究了光化学诱导的环状亚胺8a、b中的分子内夺氢或氢原子转移,然后进行环化。观察到两种类型的产物,一种是由 C-C 键的形成产生的,另一种是由 C-N 键的形成产生的。计算研究表明,氢完全转移到亚胺氮上,形成三重态双自由基中间体。系间交叉后,所得的两性离子中间体经历环化,形成最终产物。
The photochemically induced intramolecular hydrogen abstraction or hydrogen atom transfer in cyclic imines8a,bfollowed by a cyclization is investigated. Two types of products are observed, one resulting from the formation of a C–C bond, the other from the formation of a C–N bond. A computational study reveals that hydrogen is exclusively transferred to the imine nitrogen leading to a triplet diradical intermediate. After intersystem crossing, the resulting zwitterionic intermediate undergoes cyclization leading to the final product.