期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 6, 页码 1794-1798出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201812398
关键词
C-H activation; Heck reaction; palladium; photochemistry; radicals
资金
- National Institutes of Health [GM120281]
- National Science Foundation [CHE-1663779]
The Mizoroki-Heck reaction is one of the most efficient methods for alkenylation of aryl, vinyl, and alkyl halides. Given its innate nature, this protocol requires the employment of compounds possessing a halogen atom at the site of functionalization. However, the accessibility of organic molecules possessing a halogen atom at a particular site in aliphatic systems is extremely limited. Thus, a protocol that allows a Heck reaction to occur at a specific nonfunctionalized C(sp(3))-H site is desirable. Reported here is a radical relay Heck reaction which allows selective remote alkenylation of aliphatic alcohols at unactivated beta-, gamma-, and delta-C(sp(3))-H sites. The use of an easily installed/removed Si-based auxiliary enables selective I-atom/radical translocation events at remote C-H sites followed by the Heck reaction. Notably, the reaction proceeds smoothly under mild visible-light-mediated conditions at room temperature, producing highly modifiable and valuable alkenol products from readily available alcohols feedstocks.
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