Sustainable Radical Cascades to Synthesize Difluoroalkylated Pyrrolo[1,2-<i>a</i>]indoles
作者:Honggui Huang、Menglin Yu、Xiaolong Su、Peng Guo、Jia Zhao、Jiabing Zhou、Yi Li
DOI:10.1021/acs.joc.7b03017
日期:2018.2.16
We disclose herein a photocatalytic difluoroalkylation and cyclization cascade reaction of N-(but-2-enoyl)indoles with broad substrate scopes in up to 90% isolated yield. This method provides sustainable and efficient access to synthesize difluoroalkylated pyrrolo[1,2-a]indoles with a quaternary carbon center under mild conditions.
我们在此公开了N-(丁-2-烯酰基)吲哚具有宽的底物范围的光催化二氟烷基化和环化级联反应,其分离产率高达90%。该方法提供了在温和条件下可持续有效地合成具有季碳中心的二氟烷基化吡咯并[1,2- a ]吲哚的方法。
Ruthenium-Catalyzed<i>meta</i>-Selective C−H Mono- and Difluoromethylation of Arenes through<i>ortho</i>-Metalation Strategy
作者:Zhong-Yuan Li、Liang Li、Qi-Li Li、Kun Jing、Hui Xu、Guan-Wu Wang
DOI:10.1002/chem.201700354
日期:2017.3.8
Mechanistic studies indicate that a reaction pathway involving palladium‐initiated radical species is involved in the catalytic cycle. The new dual catalytic system consisting of compatible ruthenium(II) and palladium(0) complexes enables the key processes of C−H activation and mono‐/difluoromethyl‐radical formation to occur and achieves the meta‐selective functionalization efficiently. In addition, the present
Sustainable Cascades to Difluoroalkylated Polycyclic Imidazoles
作者:Sheng‐Nan Lin、Yu Chen、Xiao‐Dong Luo、Yi Li
DOI:10.1002/ejoc.202100868
日期:2021.8.20
synthesis of imidazoles from alkenes is described here. Series of highly functionalized polycyclic imidazoles were prepared efficiently with 0.01 equiv. of fac-Ir(ppy)3 as photocatalyst under the irradiation of 3 W blue LEDs. This method is characterized by a wide substrate scope with up to 95 % isolated yield under mild conditions. Mechanistic studies indicated a photocatalyzed direct radical difluoroalkylated
We herein report an unprecedented photoinduced cyclization/defluorination domino process of N-allylbromodifluoroacetamide with cyclic secondaryamines. Consequently, a wide array of valuable 3-fluoro-1,5-dihydro-2H-pyrrol-2-ones were facilely prepared from readily available starting materials under mild conditions. Preliminary mechanistic investigations suggest that a radical chain propagation and
我们在此报告了N-烯丙基溴二氟乙酰胺与环状仲胺的前所未有的光致环化/脱氟多米诺骨牌过程。因此,在温和的条件下,从容易获得的起始材料中轻松制备了一系列有价值的 3-fluoro-1,5-dihydro-2 H -pyrrol-2-ones。初步的机理研究表明,自由基链增长和胺促进的脱氟途径可能参与了这种转变。
Synthesis of 2-Fluoro-1,4-benzoxazines and 2-Fluoro-1,4-benzoxazepin-5-ones by Exploring the Nucleophilic Vinylic Substitution (S<sub>N</sub>V) Reaction of <i>gem</i>-Difluoroenamides
作者:Tamara Meiresonne、Guido Verniest、Norbert De Kimpe、Sven Mangelinckx
DOI:10.1021/acs.joc.5b00507
日期:2015.5.15
novel structural units which have been explored as precursors in heterocyclic synthesis. The presence of two fluorine atoms at the β-position of the enamide moiety endows unique electrophilic reactivity. Treatment of these enamides with oxygen nucleophiles gives rise to a nucleophilicvinylicsubstitution (SNV) reaction, which was directed toward 2-fluoro-1,4-benzoxazines and 2-fluoro-1,4-benzoxazepin-5-ones