Visible-Light-Promoted Oxidative Amidation of Bromoalkynes with Anilines: An Approach to α-Ketoamides
作者:Ke Ni、Ling-Guo Meng、Kuai Wang、Lei Wang
DOI:10.1021/acs.orglett.8b00586
日期:2018.4.20
A convenient and practical synthetic route to α-ketoamides from bromoalkynes and anilines through phototriggered organic transformations via a C–N cross-coupling and an oxidation of C≡C was developed. The reaction could be furnished without an external photocatalyst at ambient conditions, and a wide range of α-ketoamides were obtained in good yields.
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。
Novel synthesis of tetrahydro-1H-pyrrolo[1,2-a]imidazol-2-ones via decarboxylative cyclization reaction of α-amino acids and α-ketoamides
An efficient and practical method was developed for the synthesis of tetrahydro-1H-pyrrolo[1,2-a]imidazol-2-ones based on the decarboxylative cyclization reaction of α-ketoamides and proline. In most cases, tetrahydro-1H-pyrrolo[1,2-a]imidazol-2-ones were obtained with perfect diastereoselectivity to give trans-isomer in excellent yield.
基于α-酮酰胺与脯氨酸的脱羧环化反应,开发了一种高效,实用的四氢-1 H-吡咯并[1,2 - a ]咪唑-2-酮的合成方法。在大多数情况下,以完美的非对映选择性获得四氢-1 H-吡咯并[1,2- a ]咪唑-2-酮,从而以优异的收率得到反式异构体。
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。
Synthesis of Polycyclic Imidazolidinones via Amine Redox-Annulation
作者:Zhengbo Zhu、Xin Lv、Jason E. Anesini、Daniel Seidel
DOI:10.1021/acs.orglett.7b03309
日期:2017.12.1
α-Ketoamides undergo redox-annulations with cyclic secondary amines, such as 1,2,3,4-tetrahydroisoquinoline, pyrrolidine, piperidine, and morpholine. Catalytic amounts of benzoic acid significantly accelerate these transformations. This approach provides polycyclic imidazolidinone derivatives in typically good yields.