Sugar-part modified closo-carboranyluridines, 5-(o-carboran-1-yl)-2′,3′-dideoxy-3′-thiauridine 5 and 5-(o-carboran-1-yl)-2′,3′-dideoxy-2′α-phenylthiouridine 6, were synthesized. These newly synthesized closo-carboranyluridines, 5 and 6, and previously synthesized 5-(o-carboran-1-yl)uridine 1 were converted to the corresponding nido-carboranyluridines 18, 19, and 17, respectively. Water-solubility of nido-type 17 was about 100 times higher than that of its closo-counterpart 1. Water-solubilities of sugar modified nido-types 18 and 19 were about 1000 times higher than those of their closo-counterparts 5 and 6 . Cytotoxicities of the nido-types (17 and 19) were about 10 times lower than those of the corresponding closo-counterparts (1 and 6, respectively). Cellular uptake of the nido-types (17 and 19) was in the level similar to that of the closo-counterparts (1 and 6, respectively), although it is often believed that cellular uptake of hydrophilic carboranes (nido-forms) is much lower than that of lipophilic closo-carboranes.
合成了经糖部分修饰的闭
硼酰
尿苷,即 5-(邻
碳硼烷-1-基)-2′,3′-二
脱氧-3′-噻
尿苷 5 和 5-(邻
碳硼烷-1-基)-2′,3′-二
脱氧-2′α-
苯硫依啶 6。这些新合成的闭
硼酰
尿苷 5 和 6 以及之前合成的 5-(邻
硼烷基)
尿苷 1 分别被转化成相应的尼多
硼酰
尿苷 18、19 和 17。尼多型 17 的
水溶性比其闭合型 1 高出约 100 倍。糖修饰的尼多类 18 和 19 的
水溶性是其闭合对应物 5 和 6 的约 1000 倍。尼多类(17 和 19)的细胞毒性比相应的闭合对应物(1 和 6)低约 10 倍。尽管人们通常认为亲
水性
碳硼烷(nido-forms)的细胞吸收率远远低于亲脂性
碳硼烷(closeno-carboranes),但nido-type(17 和 19)的细胞吸收率与closeno-counterparts(分别为 1 和 6)的细胞吸收率相近。