Urazole synthesis. Part 2: facilitating N4 substitution
摘要:
The di-tert-butyl-di-p-nitrophenyl ester of hydrazinetetracarboxylic acid was prepared and shown to be useful in the preparation of urazoles (i.e., 1,2,4-triazolidine-3,5-diones), by reaction with a primary amine using either n-BuLi or pyridine as base, depending on the desired N-4 substituent. With more electronegative N-4 substituents, pyridine is the preferred base. This work complements our reported urazole synthesis, which introduced the N-4 substituent early in the sequence and thus did not facilitate variation at N-4 for library synthesis. (C) 2013 Elsevier Ltd. All rights reserved.
Hypolipidemic Activity of 4-Substituted 1,2-Diacyl-1,2,4-triazolidine-3,5-diones in Rodents
作者:Rupendra Simlot、Oi T. Wong、Iris H. Hall、Robert A. Izydore
DOI:10.1002/jps.2600830320
日期:1994.3
A series of 4-substituted 1,2-diacyl-1,2,4-triazolidine-3,5-diones were synthesized and shown to be hypolipidemic in rodents; serum cholesterol and triglyceride levels were significantly reduced following intraperitoneal and oral dosing at 20 mg/kg/day. The hypolipidemicactivity of the triazolidine-3,5-diones was improved when R1 was either a phenyl or a butyl group. Tissue lipid levels were reduced
合成了一系列的4-取代的1,2-二酰基-1,2,4-三唑烷-3,5-二酮,它们在啮齿动物中表现出降血脂作用。腹膜内和口服剂量为20 mg / kg /天后,血清胆固醇和甘油三酯水平显着降低。当R1为苯基或丁基时,三唑烷-3,5-二酮的降血脂活性得到改善。14天后,肝脏,主动脉和小肠中的组织脂质水平降低,而粪便脂质(例如胆固醇)升高。极低密度脂质胆固醇水平降低了,但高密度脂质胆固醇水平显着提高了。看来,1,2-二酰基-1,2,4-三唑烷-3,5-二酮的作用方式是通过抑制脂质合成的从头速率限制酶。
Synthesis and Hypolipidemic Activity of 4-Substituted 1-Acyl-1,2,4-Triazolidine-3,5-diones in Rodents
作者:Rupendra Simlot、Robert A. Izydore、Oi T. Wong、Iris H. Hall
DOI:10.1002/jps.2600820415
日期:1993.4
A series of 4-substituted1-acyl-1,2,4-triazolidine-3,5-diones demonstrated potent activity in CF1 mice when administered intraperitoneally at 20 mg/kg/day, lowering both serum cholesterol and triglyceride levels significantly. The 4-(4-chlorophenyl)-substituted compounds demonstrated better hypolipidemicactivity in rodents than 4-methoxy-, 4-nitro-, and 4-t-butylphenyl substitutions. Aryl and alkyl
当以20 mg / kg / day腹膜内给药时,一系列的4-取代的1-酰基-1,2,4-三唑烷-3,5-二酮显示出对CF1小鼠有效的活性,从而显着降低了血清胆固醇和甘油三酸酯的水平。4-(4-氯苯基)-取代的化合物在啮齿动物中表现出比4-甲氧基-,4-硝基-和4-叔丁基苯基取代更好的降血脂活性。在位置4的芳基和烷基取代而不是苯甲酰基取代表现出良好的降胆固醇活性。检查所选化合物在大鼠中的作用方式,其中口服20 mg / kg /天后血清胆固醇和甘油三酸酯水平降低;给药14天后组织脂质减少,胆汁和粪便脂质增加44-250%。血清脂蛋白水平也受到药物的调节,低密度脂蛋白和低密度脂蛋白组分中的胆固醇水平降低了2-57%。高密度脂蛋白部分中的胆固醇水平提高了94-341%。药剂抑制小鼠肝酶的活性,其方式表明该化合物干扰脂质的从头合成。
Investigating Bicyclobutane–Triazolinedione Cycloadditions as a Tool for Peptide Modification
作者:Brett D. Schwartz、Aidan P. Smyth、Philippe E. Nashar、Michael G. Gardiner、Lara R. Malins
DOI:10.1021/acs.orglett.1c04071
日期:2022.2.18
cycloaddition reactions with a diverse array of triazolinedione reagents. The synthesis of an orthogonally protected urazole buildingblock enabled the facile preparation of amino acid- and peptide-derived triazolinediones that undergo cycloaddition reactions to afford novel peptide conjugates. The additive-free and fully atom-economical nature of the transformation is a promising starting point for
PEG-N<sub>2</sub>O<sub>4</sub>System as an Efficient Reagent both for the Rapid Oxidation of Urazoles and 1,4-Dihydropyridines under Nonaqueous Conditions
作者:Mohammad Ali Zolfigol、Ezat Ghaemi、Elaheh Madrakian、Khodabakhsh Niknam
DOI:10.1002/jccs.200800106
日期:2008.6
impregnated on polyethyleneglycol to give a stable reagent. Polyethyleneglycol-N2O4 (PEG-N2O4) system was used as an effective oxidizing agent for the oxidation of urazoles and bis-urazoles to their corresponding triazolinediones and also for the aromatization of 1,4-dihydropyridines into the corresponding pyridine derivatives under mild conditions at room temperature with good to excellent yields.
strategy towards novel 1,2,4-triazole dendrimers, in which 3,5-dichloro-4-(4-methoxyphenyl)-4H-1,2,4-triazole was used as the heterocyclic building block, was successfully explored. Nucleophilic aromatic substitution at this novel AB2-monomer was used as the key step in the propagation of the heterocyclic dendrons and these dendrons were attached to both a 1,3,5-triazine and a methylene core. The peripheral
一种趋向于合成新型1,2,4-三唑树枝状大分子的合成策略,其中使用3,5-二氯-4-(4-甲氧基苯基)-4 H -1,2,4-三唑作为杂环结构单元成功探索。在这种新颖的AB 2-单体处的亲核芳香取代被用作杂环树枝状分子繁殖的关键步骤,并且这些树枝状分子同时附着在1,3,5-三嗪和亚甲基核上。外围的1,2,4-三唑不仅可以通过亲核芳族取代而且可以通过铃木交叉偶联来改变。提出的树枝状聚合物是有前途的候选物,可用于可利用大量杂原子或需要对所施加条件有更好抵抗力的应用中。