The present invention involves, in addition to many unique substituted sapphyrins, a novel method for synthesizing sapphyrins with good efficiency and high yield. An improved 9-step synthesis of substituted sapphyrins, e.g., the two C.sub.2 symmetric sapphyrins, compounds 2 and 4 of FIG. 1C, is described herein. This synthesis involves as an important step the condensation between a tripyrrane diacid and a diformyl bipyrrole. The key tripyrrane component is prepared in three high-yield steps from readily available pyrrolic precursors and the bipyrrole portion is prepared in four steps from ethyl 3-methyl-4-methylpyrrole-2-carboxylate in roughly 33% yield overall.
本发明涉及许多独特的取代萨
菲林,并且涉及一种新的合成萨
菲林的方法,其效率高,产率高。本文介绍了改进的九步合成取代萨
菲林的方法,例如图1C中的两种C.sub.2对称的萨
菲林化合物2和4。该合成方法的重要步骤是三
吡咯二酸和二甲基双
吡咯之间的缩合反应。关键的三
吡咯组分可以从易得的
吡咯前体中经过三个高产率步骤制备,而双
吡咯部分则可以从乙酰3-甲基-4-甲基
吡咯-2-羧酸乙酯中经过四个步骤制备,总产率大约为33%。