Selective phosphorylation of phenpanstatin (3a) with tetrabutylammonium dihydrogen phosphate and dicyclohexylcarbodiimide in pyridine followed by cation exchange chromatographic procedures was found to provide an efficient route to a new series (3b-3d) of promising 3,4-O-cyclic phosphate prodrugs designated phenpanstatin phosphates. Application of analogous reaction conditions to pancratistatin (1a) led to a mixture of monophosphate derivatives where sodium pancratistatin 4-O-phosphate (4a) was isolated and the structure confirmed by x-ray crystallography. Modification of the reaction conditions allowed direct phosphorylation of pancratistatin followed by cation exchange chromatography to afford sodium pancratistatin 3,4-O-cyclic phosphate (5b) which was selected for preclinical development.
                            使用
四丁基氢氧化铵磷酸和二环己基碳二
亚胺在
吡啶中选择性
磷酸化
苯酚喷丹霉素(3a),然后进行阳离子交换色谱过程,发现这是一种有效的方法,可以提供一系列有前途的3,4-O-环
磷酸酯前药,称为
苯酚喷丹霉素
磷酸盐(3b-3d)。将类似的反应条件应用于喜马拉雅白花
蒜碱(1a),导致单
磷酸衍
生物的混合物,其中分离出
钠喜马拉雅白花
蒜碱4-O-
磷酸盐(4a),并通过X射线晶体学确认其结构。修改反应条件,直接
磷酸化喜马拉雅白花
蒜碱,然后进行阳离子交换色谱,以得到
钠喜马拉雅白花
蒜碱3,4-O-环
磷酸盐(5b),该化合物被选为临床前开发的对象。