2,2-二甲基-1,3-二恶烷-5-酮与芳香醛和丙二腈一锅法合成了一系列二氢吡喃二恶英产品。第一步在回流的含水醇介质中迅速发生,然后将丙二腈亲核加成到中间体的烯烃位点,碘诱导氧化成最终产物,最终产物直接在容器中沉淀,避免了耗时和昂贵的色谱分离。产品的结构基于其核磁共振数据进行了阐明,并通过 X 射线晶体学进行了验证。在α-取代衍生物的情况下,由大量邻位取代基引起的旋转势垒导致形成阻转异构产物。为了研究这方面,4 g的分子几何由 ChemDraw Professional 20 优化,然后进行 MM2 计算。
Ultrasound mediated synthesis of dihydropyrano[3,2-<i>d</i>][1,3]dioxin-7-carbonitrile derivatives in H<sub>2</sub>O/EtOH medium
作者:Mohammad M. Mojtahedi、Masoomeh Mehraban、Kiana Darvishi、M. Saeed Abaee
DOI:10.1515/hc-2017-0014
日期:2017.4.1
aldehydes in aqueous sodium hydroxide under ultrasonic irradiation furnishes a series of pyrano[3,2-d][1,3]dioxin derivatives 3. Reactions are completed after a few minutes and the precipitated products are purified by simple crystallization from ethanol. The reaction with ethylcyanoacetate instead of malononitrile gives the respective analogous products in high yields.