New syntheses of condensed heterocycles from isoxazole derivatives. IV. Benzimidazol-2(3<i>H</i>)ones and 1-<i>H</i>-1,5-benzodiazepin-2(3<i>H</i>)one
作者:Enrico Ajello、Onofrio Migliara、Leopoldo Ceraulo、Salvatore Petruso
DOI:10.1002/jhet.5570110313
日期:1974.6
A new synthesis of the title compounds is described. Catalytic hydrogenation of 3-R-5-R'-2-nitro-4-isoxazolecarboxanilides (III) yield compounds IV which were cyclized by refluxing in toluene with traces of p-toluenesulphonic acid. In contrast to IVa which gave directly 3-acetyl-4-phenyl-1H-1,5-benzodiazepin-2(3H)one (Va), compounds IVb and IVc afforded instead the 1-substituted benzimidazolones VIb
描述了标题化合物的新合成。3-催化氢化- [R -5- [R “-2-硝基-4- isoxazolecarboxanilides(III)收率化合物IV其通过在甲苯中的痕迹回流环化p甲苯磺酸。与直接提供3-乙酰基-4-苯基-1 H -1,5-苯并二氮杂-2-2(3 H)酮(Va)的IVa相反,化合物IVb和IVc分别提供了1个取代的苯并咪唑酮VIb和VIc 。VIa,b和c,VIIb和VIIc的结构已通过化学和光谱手段(包括质谱和nmr光谱)进行了阐明。