作者:D. Chiarino、M. Fantucci
DOI:10.1002/jhet.5570280710
日期:1991.11
both isoxazole rings and diol function for the final cyclization. Starting from succinic aldehyde, the new 1,7-octadiyne-3,6-diol (4) was prepared and was submitted to a double cycloaddition with bromonitrile oxide to yield the key intermediate 1,4-bis(3-bromo-5-isoxazolyl)-1,4-butanediol. The methoxy analogs 3 were obtained by methanolysis of the bromo derivatives 2.
2,3-双(3-溴-5-异恶唑基)四氢呋喃(2)和2,5-双(3-甲氧基-5-异恶唑基)四氢呋喃(3)的合成分别通过三个步骤和四个步骤完成。顺式和反式异构体已被分离并充分表征。与迄今为止用于制备2,5-二杂芳基四氢呋喃类似物的合成方案不同,我们的方法涉及直接合成包含异恶唑环和二醇功能的关键中间体,以进行最终环化。从琥珀醛开始,新的1,7-辛二炔-3,6-二醇(4制备),并使其与氧化溴腈进行双环加成,得到关键的中间体1,4-双(3-溴-5-异恶唑基)-1,4-丁二醇。通过溴代衍生物2的甲醇分解获得甲氧基类似物3。