isothiocyanates gave thioureas and heterocyclic derivatives. Moreover, cis-fused glycopyrano[2,1-d]imidazolidin-2-thiones, which have a close structural analogy with some naturally-occurring glycosidase inhibitors, were synthesised for the first time. The mechanism of formation of glycofurano and glycopyrano[2,1-d]imidazolidin-2-thiones occurs via the intermediacy of monocyclic 5-hydroxyimidazolidin-2-thiones
2-
氨基-和2-烷基
氨基-2-脱氧
甘露糖醛糖与异
硫氰酸酯的反应产生了
硫脲和杂环衍
生物。此外,首次合成了与某些天然存在的糖苷酶
抑制剂具有相似结构相似的顺式融合
吡喃并
吡喃并[ 2,1- d ]
咪唑烷基-2-
硫酮。糖基
呋喃和糖
吡喃并[ 2,1- d ]
咪唑烷基-2-
硫酮的形成机理是通过单环5-羟基
咪唑啉-2-
硫酮的中间体。这些物质是通过分子内亲核加成一个NH基团到糖的醛基上而产生的。已分离出单环中间体,并证明了它们参与了双环
咪唑烷-2-
硫酮和/或单环
咪唑啉-2-
硫酮的形成。与之形成鲜明对比的是,通过亲核置换制备了顺式融合的
吡喃并
吡喃并
噻唑烷。