Bromination of an N-carbethoxy-7-aza-2,3-benzonorbornadiene and synthesis of N-carbethoxy-7-aza-2,3-dibromo-5,6-benzonorbornadiene: high temperature bromination. Part 14
作者:Ahmet Tutar、Metin Balci
DOI:10.1016/s0040-4020(02)01150-x
日期:2002.10
The electrophilic addition of bromine to an N-carbethoxy-7-aza-2,3-benzonorbornadiene at 0°C led in high yield to the formation of rearranged dibromides. However, high-temperature bromination of N-carbethoxy-7-aza-2,3-benzonorbornadiene in carbon tetrachloride at 77°C while irradiating, gave exclusively non-rearranged products. From the elimination of these non-rearranged products, N-carbethoxy-4-bromo-7-aza-2
在0℃下将溴亲电加到N-甲乙氧基-7-氮杂-2,3-苯并降冰片二烯中导致高产率形成重排的二溴化物。但是,在辐射下于四氯化碳中于77°C进行高温溴化N-甲乙氧基-7-氮杂-2,3-苯并降冰片二烯的过程,得到的纯产物是未重排的。通过消除这些未重排的产物,获得了N-甲乙氧基-4-溴-7-氮杂-2,3-苯并降冰片二烯作为唯一产物。类似地,单溴化物N-乙氧基-4-溴-7-氮杂-2,3-苯并降冰片二烯在77℃下溴化生成未重排的三溴化物。这些三溴化物的脱氢溴化作用提供了N-高产率的-carbethoxy-5,6-dibromo-7-氮杂-2,3-苯并降冰片二烯,它是三聚反应的合成子。