γ-Ketothioesters were easily transformed into furans, dihydrofurans or butenolides by simple treatment with diisopropylamine in diethyl ether. The substitution pattern of the starting material has a great influence on the outcome of the reaction. Possible mechanisms for the formation of the heterocycles were proposed. The structures of all new compounds were ascribed using usual NMR data (19F, 1H, 13C NMR), X-ray diffraction analysis and 1H-1H NOE experiments.
在二
乙醚中用
二异丙基胺进行简单处理后,δ-
硫代
酮类化合物很容易转化为
呋喃、二氢
呋喃或
丁烯内酯。起始材料的取代模式对反应结果有很大影响。研究人员提出了形成杂环的可能机制。利用常见的核磁共振数据(19F、1H、13C NMR)、X 射线衍射分析和 1H-1H NOE 实验对所有新化合物的结构进行了归纳。