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。
The First Synthesis of Bis(arylmethylidene)dioxan-5-ones: Potential Scaffolds to Access Vicinal Tricarbonyl Derivatives
作者:M. Abaee、Mohammad Mojtahedi、Vahid Hamidi、A.Wahid Mesbah、Werner Massa
DOI:10.1055/s-2008-1067114
日期:——
Double crossed-aldol condensation of a variety of aromatic aldehydes with 1,3-dioxan-5-one in the presence of magnesiumbromide diethyl etherate and diethylamine at room temperature is described. Excellent yields of 4,6-bis(arylmethylidene)dioxan-5-ones are achieved in a facile, one-pot, general procedure. The structure and the Z, Z-configuration of the exocyclic double bonds of the products were determined
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.
Multicomponent synthesis of novel dihydropyrano-dioxine fused-bicyclic systems as a potentially new class of heterocyclic atropisomers
作者:Mohammad M. Mojtahedi、Kiana Darvishi、M. Saeed Abaee、Mohammad R. Halvagar、Mitra Ghasemzadeh
DOI:10.1016/j.tetlet.2022.153810
日期:2022.5
vessel, avoiding time consuming and expensive chromatographic separations. The structure of the products was elucidated based on their NMR data and verified by X-raycrystallography. In the case of α-substituted derivatives, rotationalbarrier caused by the bulk of the ortho substituent led to the formation of atropisomeric products. To study this aspect, molecular geometry of 4 g was optimized by ChemDraw
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。