Synthesis and Mass Spectra of Sugar Thioimidazole Derivatives
摘要:
The reaction of 1-halogenophenylglucofuranoimidazolidine-2-thiones (1, 2) with benzyl chloride gives bicyclic S-benzylthioimidazolines (3, 4) or tetrahydroxybutyl S-benzylthioimidazoles (7, 8) depending on the presence or absence of sodium hydrogencarbonate. In the latter case a partial desulphuration takes place. The electron impact mass spectra of compounds 1-4, 7, 8, and of the acetyl derivatives 5, 6, 9, and 10 are examined. The primary fragmentations and two fragmentation pathways were observed, the importance of which depends on the cyclic character of the molecule and of the nature of the substituent (OH or OAc).
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。
Acylation of glycofurano[2,1-d]imidazolidine-2-thiones: A structural revision
作者:Martin Avalos Gonzalez、Jose L. Jimenez Requejo、Juan C. Palacios Albarran、Maria D. Ramos Montero、Juan A. Galbis Perez
DOI:10.1016/0008-6215(87)84005-3
日期:1987.3
Abstract Acetylation of glycofurano[2,1- d ]imidazolidine-2-thiones leads to the O -acetylated or N -acetylated, O -acetylated glycofurano[2,1- d ]imidazolidine-2-thiones depending on the reaction conditions. The position of acetylation on the imidazolidine-2-thione ring was demonstrated by spectroscopic data and by transformation of CSaCO groups. The formation of a glycofuranoimidazolidine-2-thione