Intramolecular Aromatic Nucleophilic Substitution of the Benzimidazole-Activated Nitro Group
作者:Tomasz Fekner、Judith Gallucci、Michael K. Chan
DOI:10.1021/ol035761w
日期:2003.12.1
A wide range of 2-(2-nitrophenyl)-1H-benzimidazoles undergo high-yielding intramolecular S(N)Ar of nitrite with N-pendant alkoxides under mild conditions (DMF, rt). When this operationally simple process is carried out at elevated temperatures in the presence of excess NaH, the initially formed S(N)Ar products are converted to the corresponding N-vinyl-substituted 2-(2-hydroxyphenyl)-1H-benzimidazoles
各种2-(2-硝基苯基)-1H-苯并咪唑在温和的条件下(DMF,rt)经历高产率的亚硝酸盐分子内S(N)Ar与N-侧链醇盐的结合。当此操作简单的过程在过量的NaH存在下于高温下进行时,最初形成的S(N)Ar产物会通过碱转化为相应的N-乙烯基取代的2-(2-羟苯基)-1H-苯并咪唑-催化的异构化。[反应:看文字]