通过区域选择性脱溴,1,3-溴转移过程,强碱处理芳构化,C7位使用胺和氰化物作为亲核试剂在没有金属源和不存在金属的情况下亲核取代反应,合成了不同的功能化8-甲氧基奎纳啶。不寻常的亲电子芳族加成(Ad E Ar)反应产物7和8的催化剂。另外,在室温下由N-(烷基氨基)-8-甲氧基喹啉在室温下在CANOH和H 2 O中存在CAN(硝酸硝酸铵)10分钟,制得喹诺啶-7,8-二酮。在广告E中Ar反应中,根据甲氧基和溴的占据位置,通过区分反应路线生成了新的立体选择性脱芳构加成产物。Ad E Ar反应不仅允许富电子稠合的杂环芳烃的功能化,而且为亲电芳族取代反应的另一种机理提供了一条新的合成途径。
Facile Oxidation of Fused 1,4-Dimethoxybenzenes to 1,4-Quinones Using NBS: Fine-Tuned Control over Bromination and Oxidation Reactions
摘要:
[GRAPHICS]Fused 1,4-dimethoxybenzenes could be oxidized to benzoquinones by either direct oxidation or demethylation-oxidation. The oxidative demethylation of 5,8-dimethoxy-2-methylquinoline using 1.1 equiv of NBS in aqueous THF and a catalytic amount of H2SO4 at 20 degreesC for 5 min gave 2-methylquinoline-5,8-dione in 98% yield without bromination. Moreover, we can control either bromination or oxidative demethylation, or both reactions.