4-Bromo-2,3-dihydroisoxazoles: synthesis and application in halogen-lithium exchange reactions
作者:Lucia Kleščíková、Jana Doháňošová、Róbert Fischer
DOI:10.1016/j.tet.2015.06.102
日期:2015.9
The synthesis of novel types of 4-bromo-2,3-dihydroisoxazoles using pyridinium tribromide in the presence of base is described. Reactivity of the initial substrates and the yields depend on the substituent at C3. To demonstrate a practical scope of the 4-bromo-substituted 2,3-dihydroisoxazoles, representative 2-benzyl-4-bromo-3,5-diphenyl-2,3-dihydroisoxazole is subjected to halogen-lithium exchange
描述了在碱存在下使用三溴化吡啶鎓合成新型的4-溴-2,3-二氢异恶唑。初始底物的反应性和产率取决于C3处的取代基。为了证明4-溴取代的2,3-二氢异恶唑的实用范围,对代表性的2-苄基-4-溴-3,5-二苯基-2,3-二氢异恶唑进行卤素-锂交换反应。相应的(2,3-二氢异恶唑-4-基)锂与三种选定的亲电试剂反应,以中等收率得到4-取代的2,3-二氢异恶唑。