Treatment of the 1,3,4-oxadiazoles 3a and 3b with 3-chloropentane-2,4-dione gave the thiazoles 4a and 4b, respectively, which were methylated to furnish compounds 5a and 5b. The formation of 1,3,4-oxadiazoles using the 1,3-dithietane 1 as starting material, and the consecutive reactions mentioned above were transferred into sugar chemistry to provide the corresponding derivatives 6 - 9 in good yields. The reaction of 5a with benzyl amine, ethylene diamine and o-phenylene diamine afforded compounds 10, 11, and 12, respectively, which possess better stabilized push-pull systems than 5a. The structures of 3a, 4a, 5a, 10, 11, and 12 were compared with the previously proposed structures I - VI, respectively. The structures of compounds 1, 3b, and 11 were confirmed by X-ray diffraction studies.
1,3,4-噁二唑3a和3b分别与3-
氯戊二酮反应生成
噻唑4a和4b,随后进行甲基化反应得到化合物5a和5b。利用1,3-二
硫杂
环戊烷1为起始物质进行
1,3,4-噁二唑的合成,并进行上述连续反应,成功地将其转化为糖
化学中的相应衍
生物6-9,收率良好。化合物5a与
苄胺、
乙二胺和
邻苯二胺反应,分别得到化合物10、11和12,它们的推-拉电子效应更稳定。化合物3a、4a、5a、10、11和12的结构分别与之前提出的结构I-VI进行了比较。化合物1、3b和11的结构经过X射线衍射研究得到了确认。