Synthesis of 3,5-Disubstituted-1,2,4-thiadiazoles via NaH–DMF-Promoted Dehydrogenative Intramolecular N–S Bond Formation
作者:Mary Antony P.、Jeevan Chakravarthy A. S.、Hiriyakkanavar Ila
DOI:10.1021/acs.joc.3c02591
日期:2024.4.5
A facile transition-metal-free synthesis of 3,5-bis(het)aryl/arylaminothiadiazoles has been reported. The overall protocol involves base-mediated tandem thioacylation of amidines with dithioesters or aryl isothiocyanates in DMF solvent and subsequent in situ intramolecular dehydrogenative N–S bond formation of thioacylamidine intermediates under an inert atmosphere. A probable mechanism involving a
已报道了一种简便的无过渡金属合成 3,5-双(杂)芳基/芳基氨基噻二唑的方法。整个方案涉及在DMF溶剂中用二硫酯或异硫氰酸芳基酯对脒进行碱介导的串联硫酰化,随后在惰性气氛下原位形成硫代酰脒中间体的分子内脱氢N-S键。有人提出了一种可能的机制,涉及由 DMF 去质子化产生的氨基甲酰阴离子作为自由基引发剂。