A stereoconservative three-step synthesis to access to 1,2,4-oxadiazine-3,6-dione is presented. This underexplored platform could be considered as a constrained oxy-azapeptide or an aza-diketomorpholine, the methodology being then successfully applied to produce enantiopure aza-analogs of diketomorpholine natural products. Importantly, the first crystal structures were obtained and compared to diketomorpholine
提出了一种立体保守的三步合成法,以合成1,2,4-恶二嗪-3,6-二酮。该未充分开发的平台可以被认为是受约束的氧-氮杂肽或氮杂-二酮吗啉,该方法随后成功地用于生产对映纯的二酮吗啉
天然产物的氮杂类似物。重要的是,获得了第一晶体结构并将其与二酮吗啉和二酮
哌嗪结构进行比较。最后,描述了有关该杂环支架与各种
氨基酸的偶联以提供原始
假二肽类似物的简单方法。