Multicomponent Domino Reaction for Concise Access to 2-Amino-Substituted 1,3,4 Oxadiazoles via Smiles Rearrangement
作者:Prasanna Anjaneyulu Yakkala、Imran A. Khan、Srinivas Reddy Dannarm、Jyoti Aboti、Rajesh Sonti、Syed Shafi、Ahmed Kamal
DOI:10.1021/acs.joc.3c00516
日期:2023.9.1
4-oxadiazole in excellent yields. The GSD studies of NMR spectra of aliphatic substrates (4di, 4dh) revealed the formation of three products, whereas, in the case of allylic and benzylic substrates, thiazolidinones were obtained as the sole products. Furthermore, to elucidate the plausible mechanism, DFT studies were performed affirming carbodiimide as the crucial intermediate for the interconversion of thiazolidinone
多组分多米诺反应已被开发用于直接从各种酰肼制备N-取代的 2-氨基-1,3,4-恶二唑(32 个实例)。2-氨基-1,3,4-恶二唑的形成涉及噻唑烷酮的 Smiles 重排,这导致碳二亚胺中间体的形成,同时发生酰胺-亚氨酸互变异构,然后环化。开发的方案具有广泛的适用性,并以优异的产率提供了所需的 2-氨基-1,3,4-恶二唑。脂肪族底物 ( 4di , 4dh ) NMR 谱的 GSD 研究揭示了三种产物的形成,而在烯丙基和苄基底物的情况下,噻唑烷酮作为唯一产物获得。此外,为了阐明合理的机制,进行了 DFT 研究,确认碳二亚胺是噻唑烷酮向恶二唑相互转化的关键中间体。