作者:Stefan E. Boiadjiev、David A. Lightner
DOI:10.1021/jo961503j
日期:1997.1.1
being less soluble in organic solvents than its parent. While this phenomenon may be attributed to the much increased acidity of the carboxylic acid hydrogens in 9, it probably also arises from less effective intramolecular hydrogen bonding due to a decreased basicity of the propionic acid carbonyl groups.
对称的二氟胆红素类似物8,12-双(2-羧基-2-氟乙基)-3,17-二乙基-2,7,13,18-四甲基-10H,21H,23H,24H-联苯-1,19由3- [2,4-二甲基-5-(甲氧基羰基)-1H-吡咯-3-基]丙酸甲酯(1)分九步合成-二酮(9)。通过中间体3- [1-(叔丁氧基羰基)-2,4-二甲基-5-(甲氧羰基)-1H-吡咯-3-基] -2-羟基丙酸酯(5)与氟的反应引入氟二乙氨基)三氟化硫(DAST)。氟化鲁宾表现出预期的IR,UV-vis和NMR光谱特性,类似于未氟化母体中胆红素XIIIalpha。但是,溶解度特性出乎意料地有所不同,氟化鲁宾在有机溶剂中的溶解度低于其母体。