申请人:THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
公开号:EP0292161A2
公开(公告)日:1988-11-23
The present invention discloses a new class of calcium chelating compounds which have a decreased affinity for calcium following illumination. These new compounds contain a photolabile nitrobenzyl derivative coupled to a tetracarboxylate Ca²⁺ chelating parent compound having the octacoordinate chelating groups characteristic of EGTA or BAPTA. However unlike EGTA or BAPTA-like compounds, in which the two halves of the chelator are linked by a simple 1,2-ethanediyl moiety, the compounds of the present invention modify the stereochemical conformation of this linkage by adding bulky substituents or incorporating the linkage into a carbocyclic or heterocyclic ring. In a first form, the new compounds are comprised of a BAPTA-like chelator coupled to a single 2-nitrobenzyl derivative, which in turn is a photochemical precursor of a 2-nitrosobenzophenone. In a second form, the new compounds are comprised of a BAPTA-like chelator coupled to two 2-nitrobenzyl derivatives, themselves photochemical precursors of the related 2-nitrosobenzophenones.
本发明公开了一类新的钙螯合化合物,该化合物在光照下对钙的亲和力降低。这些新化合物含有一种可光化的硝基苄基衍生物,该衍生物与具有 EGTA 或 BAPTA 所特有的八配位螯合基团的四羧酸 Ca²⁺ 螯合母体化合物偶联。然而,与 EGTA 或 BAPTA 类化合物不同的是,本发明的化合物通过简单的 1,2-乙二基分子连接螯合剂的两半部分,通过添加笨重的取代基或将连接部分并入碳环或杂环来改变这种连接的立体化学构象。在第一种形式中,新化合物由类似 BAPTA 的螯合剂与单一 2-硝基苯基衍生物耦合而成,而后者又是 2-亚硝基二苯甲酮的光化学前体。在第二种形式中,新化合物由一种 BAPTA 类螯合剂和两种 2-硝基苯基衍生物组成,这两种衍生物本身就是相关 2-亚硝基二苯甲酮的光化学前体。