已经开发了通过使用H 2 O-THF中的NaOH亲核取代3-芳基-4-硝基呋喃烷中的硝基来制备待探索的3-芳基-4-羟基呋喃烷的通用而简单的方法。用各种甲基化试剂(CH 2 N 2,MeI,(MeO)2 SO 2)研究了3-芳基-4-羟基呋喃恶烷的甲基化,这首次表明3-芳基-4-羟基呋喃恶烷倾向于侧-链质变互变异构。在温和条件下,合成了新型呋喃喃衍生物,N(5)-烷基化产物(3-芳基-5-甲基-1,2,5-恶二唑-4(2 H)-一2-氧化物)。与O的区域选择性形成-烷基化产物(3-芳基-4-甲氧基呋喃烷)。
Furoxans are potentially useful heteroaromatic units in pharmaceuticals and agrichemicals. However, the applications for furoxan-based compounds have been hampered due to the underdevelopment of their synthetic methods. Herein, we report a new synthetic approach for the synthesis of chloro- and bromofuroxans. The starting materials were dichloro- and dibromofuroxans, and the substituents were directly