Zinc-catalyzed chemoselective alkylation of α-keto amides with 2-alkylazaarenes
作者:Alagesan Muthukumar、Govindasamy Sekar
DOI:10.1039/c6ob02432g
日期:——
addition of 2-alkylazaarenes to α-keto amides to furnish azaarene incorporated α-hydroxy amides has been developed with a wide range of substrates in moderate to excellent yields, respectively. Chemoselectivealkylation of the keto functionality of the α-keto amides in the presence of simple ketones is the key advantage of this Zn-catalyzed transformation. This approach has been demonstrated to one gram-scale
已经开发了一种锌催化的C-(sp 3)-H将2-烷基氮杂芳烃添加到α-酮基酰胺中以提供掺入氮杂芳烃的α-羟基酰胺的方法,该方法分别在中等到极好的收率下使用了多种底物。在简单的酮存在下,α-酮酰胺的酮官能团的化学选择性烷基化是这种锌催化转化的关键优势。这种方法已被证明可以进行一克规模的合成。1 H NMR和D 2 O交换实验研究表明该反应通过Zn-烯酰胺中间体进行。
Facile photochemical synthesis of α-ketoamides and quinoxalines from amines and benzoylacetonitrile under mild conditions
Abstract A selective protocol for the synthesis of either α -ketoamides or quinoxaline derivatives under the same reaction conditions has been achieved simply by varying substitution number of amino-groups. The method features metal-free, room temperature and broad substrate scopes as well as no extra oxidant. This process applies to various substituent groups and gives products in moderate to good
Friedel–Crafts Hydroxyalkylation of Indoles with α-Keto Amides using Reusable K<sub>3</sub>PO<sub>4</sub>/<i>n</i>Bu<sub>4</sub>NBr Catalytic System in Water
作者:Alagesan Muthukumar、Govindasamy Sekar
DOI:10.1021/acs.joc.8b00844
日期:2018.8.17
in water as solvent through a solid–liquid interface formation. The transition-metal-free protocol does not demand column chromatography purification and results in highly pure indole fused α-hydroxy amides in good to excellent yields. Reusability of the catalytic system up to five cycles and extension to a gram-scale reaction are the key advantages of this transformation. The mechanisticstudy involving
通过使用固-液界面形成水中的催化量的K 3 PO 4和n Bu 4 NBr作为溶剂,首次开发了一种温和且操作简单的吲哚与α-酮酰胺的弗瑞德-克来夫斯羟烷基化方法。不含过渡金属的方案不需要柱色谱纯化,并且可以以高至优异的收率得到高纯度的吲哚稠合的α-羟基酰胺。这种转化的关键优势是催化系统最多可重复使用五个循环并扩展至克级反应。涉及1 H NMR实验的机理研究表明,反应是通过离子交换途径进行的。
Visible-light-mediated metal-free decarboxylative acylations of isocyanides with α-oxocarboxylic acids and water leading to α-ketoamides
An efficient visible-light-promoted approach for preparing α-ketoamides from α-oxocarboxylic acids, isocyanides and water is disclosed. The present transformation could be achieved under mild and metal-free conditions through a sequence of decarboxylation, radical addition and hydration processes, which provides a novel and facile route to construct α-ketoamides from simple and readily available chemical
A Cs2CO3-catalyzed hydrosilylation reaction of α-keto amides that proceeds through the in situ formation of MeSiH3 has been developed by using inexpensive polymethylhydrosiloxane in 2-methyltetrahydrofuran (2-MeTHF) as the solvent. A wide range of aryl and alkyl α-keto amides, prepared from anilines and alkylamines, were subjected to the hydrosilylation conditions to afford α-hydroxy amides in moderate
通过在2-甲基四氢呋喃(2-MeTHF)中使用廉价的聚甲基氢硅氧烷,开发了通过MeSiH 3原位形成的α-酮酰胺的Cs 2 CO 3催化的氢化硅烷化反应。将由苯胺和烷基胺制得的各种芳基和烷基α-酮酰胺置于氢化硅烷化条件下,以中等至极好的收率得到α-羟基酰胺。将该无过渡金属的方案应用于化学选择性氢化硅烷化反应,其中与简单酮相比,α-酮酰胺官能团的羰基发生还原,并进一步扩展至克级规程。