We report a direct synthesis of 2‐thioxooxazolidin‐4‐ones and oxazolidine‐2,4‐diones from α‐keto thioesters with sodium thiocyanate or potassium cyanate, respectively. The reactions proceed through nucleophilic substitution of a thioester with thiocyanate/cyanate anion, thiolate anion addition to carbonyl carbon, and subsequent intramolecular C−O heterocyclization.
我们报道了分别由α-酮
硫酯与
硫氰酸钠或
氰酸钾直接合成2-thioxooxazolidlin-4-ones和oxazolidine-2,4-diones。反应通过
硫氰酸盐/
氰酸盐阴离子的
硫酯的亲核取代,向羰基碳上的
硫醇盐阴离子的亲核取代以及随后的分子内C-O杂环化而进行。