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.