Dual Nickel‐ and Photoredox‐Catalyzed Enantioselective Desymmetrization of Cyclic
<i>meso</i>
‐Anhydrides
作者:Erin E. Stache、Tomislav Rovis、Abigail G. Doyle
DOI:10.1002/anie.201700097
日期:2017.3.20
The enantioselective desymmetrization of cyclic meso‐anhydrides with benzyl trifluoroborates under nickel‐photoredox catalysis is described. The reaction tolerates a variety of sterically and electronically different trifluoroborates, as well as structurally unique cyclic anhydrides. The trans isomer of the keto‐acid products is also observed at varying levels dependent on the trifluoroborate identity
Continuous UV-Flow Microsystem for Efficient Radical Generation from Organotrifluoroborates by Photoredox Catalysis
作者:Nassim El Achi、Maël Penhoat、Youssef Bakkour、Christian Rolando、Laëtitia Chausset-Boissarie
DOI:10.1002/ejoc.201600728
日期:2016.9
An efficient continuous-flow protocol for C–O and C–C bond formation fromorganoborates by photoredoxcatalysis under UV irradiation was explored. The combination of a cyclometalated iridium photocatalyst, high-power UV light-emitting diode irradiation, and microreactor technology resulted in very efficient radicalgeneration. The flow device enabled determination of highly accurate kinetic data that
Direct photochemical cross-coupling between aliphatic acids and BF<sub>3</sub>K salts
作者:Zhuming Sun、Bingqing Tang、Kevin K.-C. Liu、Hugh Y. Zhu
DOI:10.1039/c9cc09164e
日期:——
We describe a novel photoredox hetero-coupling reaction of two C (sp3) radicals from aliphatic acids or BF3K salts. The kinetic differences in radical persistence provide cross-selectivity, using an organic photoredox catalyst and an oxidant with visible light. This method exhibits broad scope, including several examples constructing sterically hindered C(sp3)-C(sp3) bonds.
Visible-Light-Catalyzed Radical–Radical Cross-Coupling Reaction of Benzyl Trifluoroborates and Carbonyl Compounds to Sterically Hindered Alcohols
作者:Hao-Luo Jiang、Yu-Hao Yang、Yan-Hong He、Zhi Guan
DOI:10.1021/acs.orglett.2c01583
日期:2022.6.17
require any external oxidants or reductants. In this reaction, benzyl trifluoroborates are oxidized by excited-state 4Cz-IPN to generate benzyl radicals, and the resulting boron trifluoride acts as a Lewis acid to reduce the reduction potential of carbonyl compounds. The dualroles of benzyl trifluoroborates enable aldehydes, ketones, diketones, and ketone esters to react with benzyl trifluoroborates to
Catalyst-free benzylic C(sp<sup>3</sup>)–H cross-coupling with organotrifluoroborates enabled by electrochemistry
作者:Chao Li、Ran Ding、Heng-Yi Guo、Shuang Xia、Lei Shu、Pei-Long Wang、Hongji Li
DOI:10.1039/d2gc02204d
日期:——
rare catalyst-free electrochemical cross-coupling of benzylic C–H bonds with organotrifluoroborates, which readily proceeds at room temperature and provides a unique protocol for forging C(sp3)–C(sp3), C(sp3)–C(sp2) and C(sp3)–C(sp) bonds. In particular, this work discloses the dual role of organotrifluoroborates serving both as a coupling partner and an electrolyte in C(sp3)–H functionalization.