The total synthesis of [10-13C]bilirubin IXα, the principal waste product of haem degradation, is described. Site specific labelling was accomplished by the Vilsmeier formylation of one of the dipyrrolic fragments using [1-13C]dimethylformamide. The penultimate dehydrohalogenation reaction was complicated by a competing elimination reaction which yielded a bridged biliverdin derivative. [10-13C]bilirubin IXα was prepared in an overall yield of 6% (from the step where 13C was introduced) with quantitative isotopic incorporation.
描述了血红素降解的主要废产物[10-13C]
胆红素IXα的全合成。位点特异性标记是通过使用[1-13C]二甲基甲酰胺对二
吡咯片段之一进行Vilsmeier甲酰化来完成的。倒数第二个脱卤化氢反应因竞争消除反应而变得复杂,产生桥联胆绿素衍
生物。 [10-13C]
胆红素IXα通过定量同位素掺入制备,总产率为6%(来自引入13C的步骤)。