Synthesis of biliverdins with stable extended conformations. Part II
作者:Sara E. Bari、José Iturraspe、Benjamín Frydman
DOI:10.1016/0040-4020(94)01103-7
日期:1995.2
distorted either two or the three exocyclic double bonds at the biliverdin meso-bridges away from their usual Z-syn configuration. The hexacyclic biliverdin 9 is isomorphous with the chromophores of C-phycocyanin, biliverdin 19 is an isomer of isophorcabilin, and the heptacyclic biliverdin 34 has the fullest extended conformation that the biliverdin backbone can achieve.
使用2-氯乙基联运肝素的碱催化的分子内取代反应,可以合成具有扩展构象的两个六环和一个七环联运的肝素。2-氯乙基残基位于选定的β-吡咯位置,以使它们能够与相邻吡咯环上的近端碱性氮反应。因此形成了七元环,其在biliverdin内消旋桥处的两个或三个外环双键变形,偏离了它们通常的Z- syn构型。六环胆绿素9与C-藻蓝蛋白的发色团同构,胆绿素19是异佛霉素的异构体,七环胆绿素34 具有biliverdin主链可以实现的最完整的扩展构象。