共查询到16条相似文献,搜索用时 343 毫秒
1.
2.
3.
4.
5.
6.
According to the principle of isosterism the-CH2-group of 5-(substituted benzyl)-2, 4-diaminopyrimidine was modified by—S—and—Se—and some 5-(substituted phenyl)thio-2, 4-diaminopyrimidines and 5-(substituted phenyl)seleno-2,4-diaminopyrimidines were synthesized. Their inhibitory activities on L. casei and chicken liver dihydrofolate reductase were determined. Preliminary data showed that the inhibitory activities of these compounds were less than those of the corresponding 5-(substituted benzyl)-2, 4-diaminopyrimidines. Their selectivities are also decreased. 相似文献
7.
以47个5-取代苄基-2,4-二氨基嘧啶类化合物(其中四个为新合成的化合物)对乳酪菌二氢叶酸还原酶及鸡肝二氢叶酸还原酶的表现抑制常数(Ki app)研究这类化合物的结构与选择性作用的关系。以取代基的van der Waals体积(Vw)代替MR得到和以前结果相似的定量构效相关式。在此基础上讨论了5-取代苄基-2,4-二氨基嘧啶类化合物的选择性作用。 相似文献
8.
抗肿瘤药物2,5-二乙酰氧基-1-(3′,5′-二酮-N~(4′)-取代哌嗪甲基)苯的合成研究(Ⅱ) 总被引:1,自引:0,他引:1
在探索新的抗肿瘤药物过程中,作者设计并合成了十三个具有3,5-二酮哌嗪片段及对位二乙酰氧基苯结构的化合物(Ⅲ)。经对肿瘤细胞P_(388)体外试验结果表明,化合物(Ⅲ)具有一定的生物活性,但不够理想。根据氨基酸取代的苯酚或儿茶酚对黑色素瘤等具有一定的抑制作用等,估计化合物(Ⅲ)中的乙酰氧保护基团对其生物活性具有一定的负影响。 相似文献
9.
二氨基吡啶并嘧啶类化合物具有很强的抑制二氢叶酸还原酶的作用。这类化合物中BW301u已进行临床试验以治疗癌症。本文报道了17个2,4-二氨基-6-取代苄基-5-甲基-吡啶[2,3-d]并嘧啶类化合物的合成及对L_(1210)细胞的抑制作用。合成化合物的结构经由MS-EI,~1H-NMR及元素分析确证。以MTT法测定了它们对L_(1210)细胞的抑制作用。 相似文献
10.
11.
以47个5-取代苄基-2,4-二氨基嘧啶类化合物(其中四个为新合成的化合物)对乳酪菌二氢叶酸还原酶及鸡肝二氢叶酸还原酶的表现抑制常数(Ki app)研究这类化合物的结构与选择性作用的关系。以取代基的van der Waals体积(Vw)代替MR得到和以前结果相似的定量构效相关式。在此基础上讨论了5-取代苄基-2,4-二氨基嘧啶类化合物的选择性作用。 相似文献
12.
The inhibitory effect for a set of 23 5-(X-benzyl)-2,4-diaminopyrimidines acting on bovine liver dihydrofolate reductase (DHFR) had led to the following quantitative structure-activity relationship (QSAR): log 1/C = 0.62pi3 + 0.33epsilon sigma + 4.99, where r = 0.931 and s = 0.146. C in this expression is the molar concentration of inhibitor producing 50% inhibition, pi3 is the hydrophobic parameter for substituents on the 3 position of the phenyl moiety, and epsilon sigma is the the sum of the Hammett sigma constants for the 3, 4, and 5 substituents of the phenyl ring. 相似文献
13.
Quantitative structure-activity relationships for the inhibition of Escherichia coli (MB 1428) dihydrofolate reductase (DHFR) by 61 5-(substituted benzyl)-2,4-diaminopyrimidines are reported and analyzed. The 61 compounds include 17 congeners whose activities have not been previously reported, five of which have a 5'-substituent larger than a methoxy group. The correlation equations indicated that the molar refractivity (MR) values of the 5'-substituent, just as with the 3'- and 4'-substituents, contributed maximally at the value of 0.79 with no increment of binding for compounds with MR larger than 0.79 (which corresponds to a 5'-methoxy substitution). This experimental result is in agreement with the crystal structure of the Escherichia coli DHFR-trimethoprim complex, which shows a reasonably large trimethoprim-binding site. The inhibition of E. coli (MB 1428) DHFR by nine of the 17 new benzylpyrimidines is at lower concentrations than for trimethoprim. However, all 17 are much less potent than trimethoprim in inhibition of growth of E. coli (1515). 相似文献
14.
前报报道在“催醒安”的对位异构体的苯环上引入烷基,可以增强对胆碱酯酶的抑制作用。为了探索在邻位异构体(Ⅰ)的苯环上引入烷基对生理活性的影响,合成了二甲氨基甲酸-[2-(2-二甲氨基)乙氧基-4(或5)-特丁基]苯酯(Ⅱ)。 相似文献
15.
目的合成N-(双膦羧次甲基)-6(5-氟-2,4-二氧代3,4-二氢-2H-嘧啶-1-基)-6-氧代-己酰胺,并进行初步体外骨靶向性实验。方法以5-氟尿嘧啶为原料,经硅烷化、缩合、氢解3步合成6-(5-氟-2,4-二氧代-3,4-二氢-2H-嘧啶-1-基)-6-氧代-己酸(2),用二氯亚砜氯化后再与含氨基的偕二膦酸酯偶联,最后再用溴代三甲基硅烷特异性解离掉膦酸酯得到目标化合物L,并采用羟磷灰石晶体吸附实验考察目标物的骨靶向性。结果合成了目标物L,并利用^-1H—NMR、IR和MS进行了结构确证。结论体外骨靶向性实验结果显示目标物L有较好的骨靶向性。 相似文献
16.
目的:改进1-[2-(N-甲基)氨基-2-(2,4-二氯苯基)乙基]-1H-1,2,4-三唑的合成方法,降低成本,提高收率,方法:以2-氯-1-(2,4-二氯苯基)乙酮为原料,经三唑烷基化与甲胺反应生成酮亚胺后还原(A法),或与N-甲基甲酰胺进行Leukart反应(B法),结果:A和B两种方法制得目标化合物的收率分别为57.6%和63.2%。结论:A和B两种方法原料易得,反应简便,降低了成本,提高了收率。 相似文献