A series of eight 3, 3-disubstituted nitrosoureas (IVa-h) having the nitrosoureido group at the C-6 position of methyl glucopyranoside or methyl 2-acetamido-2-deoxy-glucopyranoside was prepared and tested for antitumor activities. Heating of the 6-O-p-tolylsulfonyl derivatives (I and II) with various alkylamines followed by reaction with 2-chloroethyl isocyanate gave the corresponding ureas (IIIa-h), which were nitrosated with nitrogen tetroxide to give IVa-h in high yields. The nitrosoureas (IVa-h) were significantly less active than the other positional isomers with respect to the nitrosoureido group prepared previously. Compounds IVa-h appear to be activated by a γ hydroxyl group at the C-4 position. The rate of activation, however, proved to be much slower than those of the C-1 or C-3 positional isomers having a β hydroxyl group. The structure-activity relationships of the positional isomers are discussed in the light of this difference in the rate of activation.
一系列八种3, 3-二取代的亚硝基
脲化合物(IVa-h)被合成,并在
甲基葡萄糖吡喃糖或甲基2-乙酰
氨基-2-脱氧
葡萄糖吡喃糖的C-6位点上具有亚硝基
脲基团,随后进行抗肿瘤活性测试。将6-O-对
甲苯磺酰基衍
生物(I和II)与各种烷基胺加热反应,随后与2-
氯乙基异氰酸酯反应,得到了相应的
脲(IIIa-h),这些
脲与
四氧化二氮进行亚硝化反应,得到IVa-h,产率很高。与之前合成的其他位置异构体相比,亚硝基
脲(IVa-h)的活性明显较低。IVa-h化合物似乎通过C-4位置的γ羟基团被激活。然而,激活速度证明明显慢于具有β羟基团的C-1或C-3位置异构体。根据这一激活速率的差异,讨论了位置异构体的结构-活性关系。