Zinc Trimethylsilylamide as a Mild Ammonia Equivalent and Base for the Amination of Aryl Halides and Triflates
作者:Dae-Yon Lee、John F. Hartwig
DOI:10.1021/ol050141b
日期:2005.3.1
report that Zn[N(SiMe(3))(2)](2) is a mild ammoniaequivalent and base for the palladium-catalyzed amination of aryl halides and triflates. In contrast to LiN(SiMe(3))(2), the combination of Zn[N(SiMe(3))(2)](2) and LiCl coupled with aryl halides and triflates containing base-sensitive functionality in high yields. In addition, aryl bromides coupled with aryl and alkylamines with the combination of
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.
Nickel catalyzed decarboxylative alkylation of aryl triflates with anhydrides
作者:Hui Chen、Xuebin Liao
DOI:10.1016/j.tet.2019.05.070
日期:2019.8
Aliphatic acid anhydrides are the versatile building blocks and the new method for the conversion of anhydrides is thus of great significance. Herein, we report the decarboxylative alkylation of aryl triflates with aliphatic acid anhydrides via nickel catalysis. This novel method provides a facile access to construct Csp2-Csp3 bond. In addition, this method is compatible with a broad array of functional
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
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