Late-stage azolation of benzylic C‒H bonds enabled by electrooxidation
作者:Zhixiong Ruan、Zhixing Huang、Zhongnan Xu、Shaogao Zeng、Pengju Feng、Ping-Hua Sun
DOI:10.1007/s11426-020-9938-9
日期:2021.5
The installation of azoles via C-H/N-H cross-coupling is significantly underdeveloped, particularly in benzylic C-H azolation due to the requirement for external chemical oxidants and the challenge in controlling the site- and chemo-selectivity. Herein, a late-stage azolation of benzylic C-H bonds enabled by electrooxidation is described, which proceeds in an undivided cell under mild, catalyst- and
Palladium-Catalyzed Intermolecular α-Arylation of Zinc Amide Enolates under Mild Conditions
作者:Takuo Hama、Darcy A. Culkin、John F. Hartwig
DOI:10.1021/ja056076i
日期:2006.4.1
The intermolecular α-arylation and vinylation of amides by palladium-catalyzedcoupling of aryl bromides and vinyl bromides with zinc enolates of amides is reported. Reactions of three different types of zinc enolates have been developed. The reactions of aryl halides occur in high yields with isolated Reformatsky reagents generated from α-bromo amides, with Reformatsky reagents generated in situ from
报道了通过芳基溴化物和乙烯基溴化物与酰胺的烯醇锌的钯催化偶联,酰胺的分子间α-芳基化和乙烯基化。已经开发了三种不同类型的烯醇化锌的反应。芳基卤化物与由 α-溴酰胺产生的分离的 Reformatsky 试剂、由 α-溴酰胺原位产生的 Reformatsky 试剂以及通过用氯化锌淬灭酰胺的烯醇锂而产生的烯醇锌以高产率发生反应。这种使用锌烯醇化物代替碱金属烯醇化物极大地扩展了酰胺芳基化的范围。该反应在室温或 70 °C 下与含有氰基、硝基、酯、酮、氟、羟基或氨基官能团的溴芳烃以及溴吡啶发生反应。此外,该反应已开发与吗啉酰胺,其产物是酮和醛的前体。酰胺的烯醇锌的芳基化是用带有受阻五苯的催化剂进行的...
Chemoselective α-Sulfidation of Amides Using Sulfoxide Reagents
作者:Mario Leypold、Kyan A. D’Angelo、Mohammad Movassaghi
DOI:10.1021/acs.orglett.0c03160
日期:2020.11.20
The direct α-sulfidation of tertiary amidesusing sulfoxide reagents under electrophilic amide activation conditions is described. Employing convenient and readily available reagents, selective functionalization takes place to generate isolable sulfonium ions en route to α-sulfide amides. Mechanistic studies identified activated sulfoxides as promoters of the desired transformation and enabled the
Direct defluorinative amidation–hydrolysis reaction of <i>gem</i>-difluoroalkenes with <i>N</i>,<i>N</i>-dimethylformamide, and primary and secondary amines
作者:Biyun Wang、Xianghu Zhao、Qingyun Liu、Song Cao
DOI:10.1039/c8ob02322k
日期:——
A novel and efficient method for the synthesis of arylacetamides by the reactions of gem-difluoroalkenes with N,N-dialkylformamides, and primary and secondary amines with the assistance of KOtBu and water was developed.
开发了一种新颖有效的合成方法,该方法通过宝石-二氟烯烃与N,N-二烷基甲酰胺以及伯胺和仲胺在KO t Bu和水的反应下合成芳基乙酰胺。
Ni-Catalyzed Regiodivergent and Stereoselective Hydroalkylation of Acyclic Branched Dienes with Unstabilized C(sp<sup>3</sup>) Nucleophiles
unstabilized C(sp3) nucleophiles, a highly regioselective 1,4-addition process is favored. The addition products are obtained in high yield and with excellent stereocontrol of the internal olefin. Using a chiral ligand and imides as carbon nucleophiles, a 3,4-addition protocol was developed enabling to construct two contiguous tertiary stereocenters in a single step with moderate to high levels of diastereocontrol