Antiproliferative 4-(1,2,4-oxadiazol-5-yl)piperidine-1-carboxamides, a new tubulin inhibitor chemotype
摘要:
We discovered a new chemical class of antiproliferative agents, 4-(1,2,4-oxadiazol-5-yl)piperidine-1-carboxamides. SAR-guided optimization of the two distinct terminal fragments yielded a compound with 120 nM potency in an antiproliferative assay. Biological activity profile studies (COMPARE analysis) demonstrated that 4-(1,2,4-oxadiazol-5-yl)piperidine-1-carboxamides act as tubulin inhibitors, and this conclusion was confirmed via biochemical assays with pure tubulin and demonstration of increased numbers of mitotic cells following treatment of a leukemia cell line. (C) 2014 Elsevier Ltd. All rights reserved.
P-(morpholin-1-yl)propioamidoxime 与芳族磺酰氯 (p-XC 6 H 4 SO 2 Cl; X = CH 3 O, CH 3 , H, Br, Cl, NO 2 ) 在氯仿中的反应三乙胺的存在不会产生预期的 O-芳基磺酰基-β-(吗啉-1-基)丙酰胺肟;相反,该反应提供后一种化合物的异构体,2-氨基-8-氧杂-1,5-二氮杂螺[4.5]dec-1-烯-5-芳基磺酸铵。反应产物的结构是通过物理化学方法、光谱学和X射线衍射确定的。
Reaction Products of β-Aminopropioamidoximes Nitrobenzenesulfochlorination: Linear and Rearranged to Spiropyrazolinium Salts with Antidiabetic Activity
para-nitrobenzenesulfonates. An exception is ortho-nitrobenzenesulfochlorination of β-(thiomorpholin-1-yl)propioamidoxime, which is regioselective at room temperature, producing two spiropyrazolinium salts (ortho-nitrobezenesulfonate and chloride), and regiospecific at the boiling point of the solvent, when only chloride is formed. The para-Nitrobezenesulfochlorination of β-(benzimidazol-1-yl)propioamidoxime
取决于初始相互作用物质的结构和反应条件,β-氨基丙酰胺肟的硝基苯磺酰氯化会产生一组产物。酰胺肟,在末端 C 原子上被六元N-杂环(哌啶、吗啉、硫代吗啉和苯基哌嗪)官能化,这是由于中间反应产物的 S N 2 取代氢原子的自发分子内杂环化的结果偕胺肟片段的肟基团被硝基苯磺酰基基团,生成邻或对硝基苯磺酸螺吡唑啉鎓。一个例外是邻β-(硫代吗啉-1-基)丙胺肟的-硝基苯磺酰氯化,在室温下具有区域选择性,生成两种螺吡唑啉盐(邻-硝基苯磺酸盐和氯化物),在溶剂沸点下具有区域选择性,此时仅形成氯化物。由于芳族 β-胺氮原子的亲核性降低,β-(苯并咪唑-1-基)丙胺肟的对硝基苯磺氯化在两个温度下都是区域特异性的,并产生O-对硝基苯磺氯化产物。对新型硝基苯磺酰氯化偕胺肟的抗糖尿病筛选发现了具有高于参考药物阿卡波糖的体外α-葡萄糖苷酶活性的有希望的样品。1H-NMR光谱和X射线分析揭示了六元杂环的缓慢反转,并通