Ni-Catalyzed Reductive Cyanation of Aryl Halides and Phenol Derivatives via Transnitrilation
作者:L. Reginald Mills、Joshua M. Graham、Purvish Patel、Sophie A. L. Rousseaux
DOI:10.1021/jacs.9b11208
日期:2019.12.11
reductive coupling for the synthesis of benzonitriles from aryl (pseudo)halides and an electrophilic cyanating reagent, 2-methyl-2-phenyl malononitrile (MPMN). MPMN is a bench-stable, carbon-bound electrophilic CN reagent that does not release cyanide under the reaction conditions. A variety of medicinally relevant benzonitriles can be made in good yields. Addition of NaBr to the reaction mixture allows for
Pd‐Catalyzed Intermolecular Transthiolation of Ar‐OTf Using Methyl 3‐(Methylthio) Propanoate as a Thiol Surrogate
作者:Dandan Pan、Shasha Xu、Qingqiang Tian、Yahui Li
DOI:10.1002/ejoc.202100822
日期:2021.9.7
The work describes an intermoleculartransthiolation of Ar−OTf usingmethyl 3-(alkyllthio) propanoate as an odourless thiolsurrogate. A series of substituted aryl methyl sulfides have been obtained in moderate to good yields.
ortho-Difunctionalization of arynes by LiZnEt2(TMP)-mediated deprotonative zincation/elimination of aryl triflates
作者:Seoyoung Cho、Qiu Wang
DOI:10.1016/j.tet.2018.03.044
日期:2018.6
Generation of arynes from aryl triflates has been achieved using lithium diethyl(tetramethylpiperidyl)-zincate base LiZnEt2(TMP), via a directed ortho-deprotonative zincation and subsequent elimination of the triflate group. The aryne formation has been demonstrated by the cycloaddition reaction with diene and insertion reactions with ureas. Furthermore, the nucleophilicaddition of LiZnEt2(TMP) to
1,2-Difunctionalization of Aryl Triflates: A Direct and Modular Access to Diversely Functionalized Anilines
作者:Seoyoung Cho、Qiu Wang
DOI:10.1021/acs.orglett.0c00320
日期:2020.2.21
ortho-Amino difunctionalization of aryl triflates has been achieved via a three-component reaction. The cascade reaction proceeds through a zincate base-mediated deprotonative formation of a reactive aryne intermediate, in situ nucleophilic addition, and coupling with electrophilic partners. This strategy leverages the advantageous reactivity of organozincate intermediates, enabling the installation
zinc bromides and regioconvergent Negishi coupling with aryl or alkenyl triflates. The use of a suitable phosphine ligand favoring Pd migration enabled the selective formation of the linear cross‐coupling product. Subsequently, mixtures of secondary alkyl bromides were prepared from linear alkanes by standard bromination, and regioconvergent cross‐coupling then provided access to the corresponding linear