Carbohydrate-Based Synthetic Approach to Control Toxicity Profiles of Folate−Drug Conjugates
作者:Iontcho R. Vlahov、Hari Krishna R. Santhapuram、Fei You、Yu Wang、Paul J. Kleindl、Spencer J. Hahn、Jeremy F. Vaughn、Daniel S. Reno、Christopher P. Leamon
DOI:10.1021/jo100448q
日期:2010.6.4
cysteine-loaded resin, followed by the addition of folate, deprotection, and cleavage, resulted in the isolation of the new folate−spacer: Pte-γGlu-(Glu(1-amino-1-deoxy-d-glucitol)-Glu)2-Glu(1-amino-1-deoxy-d-glucitol)-Cys-OH (21). The addition of 21 to an appropriately modified desacetylvinblastine hydrazide (DAVLBH) resulted in a conjugate (25) with an improved therapeutic index. Treatment of 25 with DTT
为了更好地调节长春碱叶酸缀合物,EC145,新的叶酸-间隔并入1-氨基-1-脱氧的生物分布d -glucitol-γ谷氨酸亚基插入的肽主链,被合成。将Fmoc-3,4的合成5,6-二- ö异亚丙基-1-氨基-1-脱氧- d -glucitol-γ谷氨酸20,适合的Fmoc策略的固相肽合成(SPPS),是从δ-葡糖酸内酯分四个步骤实现。在半胱氨酸负载的树脂上添加交替的谷氨酸和20个部分,然后添加叶酸,脱保护和裂解,从而分离出新的叶酸间隔基:Pte-γGlu-(Glu(1-amino-1 -deoxy- d -glucitol)-Glu)2-Glu(1-氨基- 1-脱氧d -glucitol)-Cys-OH(21)。将21添加到适当修饰的去乙酰长春碱肼(DAVLBH)中产生具有改善的治疗指数的缀合物(25)。在室温下,在中性缓冲液中用DTT处理25,表明游离的DAVLBH将在内化的内体的还原环境下释放。