Photo-oxidative Ruthenium(II)-Catalyzed Formal [3 + 2] Heterocyclization of Thioamides to Thiadiazoles
作者:Pragya Pali、Gaurav Shukla、Priya Saha、Maya Shankar Singh
DOI:10.1021/acs.orglett.1c00766
日期:2021.5.21
An operationally simple and sustainable one-pot photo-oxidative formal [3 + 2] heterocyclization of β-ketothioamides with aryldiazonium salts catalyzed by Ru(bpy)3Cl2 has been realized to provide 2,4-disubstituted 5-imino-1,2,3-thiadiazoles in good to high yields under mild reaction conditions for the first time. The reaction proceeded via an α-phenylhydrazone adduct of thioamides leading to 1,2,3-thiadiazoles
通过Ru(bpy)3 Cl 2催化,可操作简便且可持续的一锅光氧化形式[3 + 2]的β-酮硫酰胺与芳基重氮盐杂环杂环化反应可提供2,4-二取代的5-亚氨基-1, 2,3-噻二唑首次在温和的反应条件下以高收率获得高收率。该反应通过硫酰胺的α-苯基hydr加合物进行,在室温下通过NS键形成1,2,3-噻二唑。值得注意的是,关于在环的5位上的环外C═N双键,产物具有Z-立体化学。