Radical Cyclization Reactions with a Zirconocene-Olefin Complex as an Efficient Single Electron Transfer Reagent
作者:Kazuya Fujita、Hideki Yorimitsu、Koichiro Oshima
DOI:10.1055/s-2002-19777
日期:——
A zirconocene-olefin complex induced reductive radical cyclization of β-haloalkyl allyl acetals in THF. This complex served as a single electrontransferreagent to promote the cyclization. Furthermore, the reaction in DME afforded tetrahydrofuranylmethylzirconium species effectively.
1,3,2‐Diazaphospholene‐Catalyzed Reductive Cyclizations of Organohalides**
作者:Johannes Klett、Łukasz Woźniak、Nicolai Cramer
DOI:10.1002/anie.202202306
日期:2022.7.25
1,3,2-diazaphospholenes hydrides (DAP-H) are shown as efficient catalysts for reductive radical cyclization of aryl and alkyl halides under irradiation with visible light. The pivotal DAP catalyst turnover was achieved by a DBU-assisted σ-bondmetathesis between the formed DAP halide and HBpin.
Activation of Aryl and Alkyl Halides Enabled by Strong Photoreduction Potentials of a Hantzsch Ester/Cs<sub>2</sub>CO<sub>3</sub> System
作者:Junhua Xu、Yingjun Lan、Bin Liu
DOI:10.1021/acs.joc.3c02320
日期:2024.1.5
We disclose herein a light-induced Hantzsch ester-initiated aryl and alkyl radical generation protocol from aryl halides (Br and Cl) and alkyl iodides. This method provides access to a wide range of benzo-fused heterocycles and C(sp3)–C(sp3) coupling products. The reductive detosylation reaction has also been demonstrated using the same reaction conditions. Initial mechanism studies provide evidence
Sml2-promoted aryl radical cyclization. A new synthetic entry into heterocycles
作者:Junji Inanaga、Osamu Ujikawa、Masaru Yamaguchi
DOI:10.1016/s0040-4039(00)74317-6
日期:1991.4
Benzofuran, naphthofuran, and indole frameworks were expediently constructed at ambient temperature from arene bromides with ortho O- and N-substituents containing double or triple bonds via radical cyclization process promoted by Sml2.