Synthesis of Difluoromethylene-Containing 1,2,4-Oxadiazole Compounds via the Reaction of 5-(Difluoroiodomethyl)-3-phenyl-1,2,4-oxadiazole with Unsaturated Compounds Initiated by Sodium Dithionite
作者:Fanhong Wu、Xueyan Yang、Zhonghua Wang、Xiang Fang、Xianjin Yang、Yongjia Shen
DOI:10.1055/s-2007-983705
日期:2007.6
5-(Difluoroiodomethyl)-3-phenyl-1,2,4-oxadiazole, synthesized by the iodination of the corresponding zinc reagent of 5-(bromodifluoromethyl)-3-phenyl-1,2,4-oxadiazole, reacted with various unsaturated compounds, such as alkenes, alkynes, pent-4-en-1-ols, and pent-4-enoic acids, in the presence of sodium dithionite and sodium hydrogen carbonate in aqueous acetonitrile solution at ambient temperature to afford various difluoromethylenated 1,2,4-oxadiazole-containing compounds, including γ-butyrolactones and tetrahydrofurans, in moderate yields.
5-(二氟碘甲基)-3-苯基-1,2,4-恶二唑,由 5-(溴二氟甲基)-3-苯基-1,2,4-恶二唑的相应锌试剂碘化合成,与各种不饱和化合物,如烯、炔、戊-4-烯-1-醇和戊-4-烯酸反应、在二亚硫酸钠和碳酸氢钠的存在下,在乙腈水溶液中于常温下反应,得到各种二氟甲基化的含 1,2,4-恶二唑的化合物,包括δ-丁内酯和四氢呋喃,收率适中。