Nickel-catalyzed decarbonylation of N-acylated N-heteroarenes is developed. This method can be used to produce a variety of N-aryl heteroarenes, including pyrroles, indoles, carbazoles and phenoxazines, using benzoic acid derivatives as arylating reagents. Arylnickelamide intermediates that are relevant to the catalytic reaction were characterized by X-ray crystallography. When N-acylated benzimidazoles
开发了镍催化的N-酰化 N-杂芳烃的脱羰。该方法可用于生产多种N-芳基杂芳烃,包括吡咯、吲哚、咔唑和吩恶嗪,使用苯甲酸衍生物作为芳基化试剂。与催化反应相关的芳基镍酰胺中间体通过 X 射线晶体学进行了表征。当N-酰化苯并咪唑用作底物时,脱羰伴随1,2-迁移形成2-芳基化苯并咪唑。
An Efficient Protocol to Synthesize N-Acyl-enamides and -Imines by Pd-Catalyzed Carbonylations
2‐bis(di‐tert‐butylphosphinoxy)ethane (tBu2POCH2CH2OPtBu2) was synthesized. In the presence of this ligand, various N‐acyl enamides were obtained in good yields and chemoselectivity by Pd‐catalyzed carbonylation reaction of imines containing α‐H. Meanwhile, imines without α‐H could be transformed to N‐acyl imines, which form highly hindered amides by straightforward addition of Grignard reagents.
首次合成了二齿次膦酸酯配体1,2-双(二叔丁基次膦氧基)乙烷(t Bu 2 POCH 2 CH 2 OP t Bu 2)。在存在这种配体的情况下,通过Pd催化含α-H的亚胺的羰基化反应,可以得到高收率和化学选择性的各种N-酰基酰胺。同时,不含α-H的亚胺可以转化为N-酰基亚胺,通过直接添加格利雅试剂即可形成受阻酰胺。
DMAPO/Boc
<sub>2</sub>
O‐Mediated One‐Pot Direct
<i>N</i>
‐Acylation of Less Nucleophilic
<i>N</i>
‐Heterocycles with Carboxylic Acids
作者:Atsushi Umehara、Soma Shimizu、Makoto Sasaki
DOI:10.1002/cctc.202201596
日期:2023.3.8
Nitrogen Nucleophiles: A general method for direct N-acylation of less nucleophilic nitrogen heterocycles with carboxylic acids is reported. The method, which uses simple, commercially available reagents, no metals and user-friendly conditions, shows excellent functional group tolerance and broad substrate scope for both nitrogen nucleophiles and carboxylic acids.
Dearomatization of Indoles via Azido Radical Addition and Dioxygen Trapping To Access 2-Azidoindolin-3-ols
作者:Meng-Meng Xu、Wen-Bin Cao、Rao Ding、Hai-Yan Li、Xiao-Ping Xu、Shun-Jun Ji
DOI:10.1021/acs.orglett.9b02009
日期:2019.8.16
Efficient copper-catalyzed aerobic oxidative dearomatization of indoles with trimethylsilyl azide (TMSN3) for the synthesis of 2-azidoindolin-3-ols has been developed. Molecular oxygen served as the oxygen-atom source in this transformation. The multicomponent reaction is appreciated by its high site- and diastereoselectivity, broad substrate scope, and mild conditions at room temperature.
Nickel-Catalyzed Addition of C–C Bonds of Amides to Strained Alkenes: The 1,2-Carboaminocarbonylation Reaction
C(aryl)–C(═O) bonds of aryl amides can be activated and added across alkenes with the aid of a nickel catalyst. This 1,2-carboaminocarbonylation reaction enables the dicarbofunctionalization of alkenes with an atom economy of 100%.