Synthesis of Benzimidazolequinone Analogue of Cyclopropamitosene Antitumor Agents
作者:Fawaz Aldabbagh、John O’Shaughnessy、Desmond Cunningham、Paul Kavanagh、Dónal Leech、Patrick McArdle
DOI:10.1055/s-2004-831341
日期:——
The preparation of a pyrrolo[ 1,2-a]benzimidazole, pyrido[1,2-a]benzimidazole and pyrrolo[1,2-a]benzimidazolequinone containing a fused cyclopropane ring is reported. Their synthesis involved the thermolysis of the respective benzimidazole-2-Eschenmoser hydrazones (aziridinyl imines), which facilitated an intramolecular 1,3-dipolar cycloaddition. X-ray crystal structure of one [3+2] pyrazoline-cycloadduct
报道了含有稠环丙烷环的吡咯并[1,2-a]苯并咪唑、吡啶并[1,2-a]苯并咪唑和吡咯并[1,2-a]苯并咪唑醌的制备。它们的合成涉及各自苯并咪唑-2-Eschenmoser 腙(氮丙啶基亚胺)的热解,这促进了分子内 1,3-偶极环加成。展示了一种 [3+2] 吡唑啉环加合物的 X 射线晶体结构。环丙吡咯并 [1,2-a] 苯并咪唑醌的 -1.052 V(相对于二茂铁)的氧化还原电位通过循环伏安法测定,表明单电子还原比丝裂霉素 C 或环丙酰胺更容易发生。