Based on the analysis of the crystal structure of the Ca2+ salt of ionomycin and the chemical and physical data on ionomycin, a number of ionomycin analogues have been synthesized to study the structural features affecting the Ca2+ binding and transport. Compounds 2, 3, and 4 were synthesized to study the effect of additional intramolecular oxygen coordination sites on Ca2+ transport. Compounds 5a–5d were prepared to study the effect of lipid solubility on Ca2+ binding and transport. Compounds 6a–6c were prepared to study the effect of the distance between the β-diketone and the carboxyl group on Ca2+ transport. A general synthetic route to these compounds has been developed. The key reactions in this route are the consecutive regioselective alkylations of the dianion of 2,4-pentanedione with the appropriate bromides.[Formula: see text]
根据对
离子霉素(ionomycin)的Ca
2+盐的晶体结构分析以及对
离子霉素的
化学和物理数据,合成了许多
离子霉素类似物以研究影响Ca
2+结合和传输的结构特征。化合物2、3和4被合成用于研究额外的分子内氧配位位点对Ca
2+传输的影响。化合物5a–5d被制备用于研究脂溶性对Ca
2+结合和传输的影响。化合物6a–6c被制备用于研究
β-二酮和羧基之间距离对Ca
2+传输的影响。已经开发了这些化合物的一般合成路线。该路线中的关键反应是对
2,4-戊二酮的二阴离子进行连续的区域选择性烷基化反应,使用适当的
溴化物。