Acylation of oxindoles using methyl/phenyl esters <i>via</i> the mixed Claisen condensation – an access to 3-alkylideneoxindoles
作者:Ramdas Sreedharan、Purushothaman Rajeshwaran、Pradeep Kumar Reddy Panyam、Saurabh Yadav、C. M. Nagaraja、Thirumanavelan Gandhi
DOI:10.1039/d0ob00789g
日期:——
Predominantly, aggressive acid chlorides and stoichiometric coupling reagents are employed in the acylating process for synthesizing carbonyl tethered heterocycles. Herein, we report simple acyl sources, viz. methyl and phenyl esters, which acylate oxindoles via the mixed Claisen condensation. This straightforward protocol is mediated by LiHMDS and KOtBu and successfully applied to a wide range of
在酰化过程中,主要使用侵蚀性的酰氯和化学计量的偶联剂来合成羰基束缚的杂环。在这里,我们报告简单的酰基来源,即。甲酯和苯酯,它们通过混合的克莱森缩合反应酰化吲哚。这种简单的方法是由LiHMDS和KOtBu介导的,并成功地应用于各种基材。这是一个值得注意的转变,它跳过了烯醇化物和酰化的逐步生成,并且该反应在中等温度下进行,没有任何副反应。该方案产生了芳基环中的邻位取代基的第一个例子,该芳基环上有供电子和吸电子底物。有趣的是,坚固的有机金属二茂铁基甲基酯在这些条件下容易裂解。此外,