Synthesis of Spin-Labelled 1,4-Dihydropyridines and Pyridines
作者:Olga H. Hankovszky、Cecilia P. Sár、Kálmán Hideg、Gyula Jerkovich
DOI:10.1055/s-1991-26389
日期:——
1,4-Dihydropyridines spin-labelled with 5- and 6-membered nitroxyl radicals in positions 1-4 of the pyridine ring were synthesized. The oxidation of these dihydropyridines to pyridines with active manganese dioxide was investigated.
New mono- and difunctionalized 2,2,5,5-tetramethylpyrrolidine- and Δ<sup>3</sup>-pyrroline-1-oxyl nitroxide spin labels
作者:John F. W. Keana、Kálmán Hideg、G. Bruce Birrell、Olga H. Hankovszky、George Ferguson、Masood Parvez
DOI:10.1139/v82-209
日期:1982.6.15
spin labels have been prepared. Nitroxide mesylate 5 and p-hydroxyacetophenone gave 6 which was selectively brominated with cupric bromide to give the alkylating agent 7. The more watersoluble phenacyl bromide analogue 17 was prepared either via the route 8 → 11 → 17 or else via the route15 → 16 → 11 → 17. Preliminary results indicate that toward aconitase, nitroxide alkylating agent 17 behaves similarly
acid phenethyl ester, CAPE) and unnatural (N-acetylcysteine, paramagnetic alcohols) antioxidants. The in vitro antioxidant activity was tested by 2,2′-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) radical scavenging, while assays of cell protection against reactive oxygen species were carried out in the presence of 2′,7′-dichlorofluorescein diacetate and H2O2. Paramagnetic esters without phenol
摘要已经研究了新制备的含氮氧化物部分作为潜在抗氧化剂的咖啡酸盐的结构-活性关系,并将其与已知的天然(咖啡酸苯乙酯,CAPE)和非天然(N-乙酰半胱氨酸,顺磁性醇)抗氧化剂的结构-活性关系进行了比较。通过2,2'-叠氮基双(3-乙基苯并噻唑啉-6-磺酸)自由基清除测试体外抗氧化活性,同时在2',7'-二氯荧光素存在下进行细胞对活性氧的保护性测定双乙酸盐和H 2 O 2。没有酚基序的顺磁性酯表现出最低的抗氧化活性,其次是具有中等活性的顺磁性醇。在研究的化合物中,顺磁性酚类化合物是最好的抗氧化剂。由于新的顺磁性CAPE类似物在NIH3T3成纤维细胞中的细胞毒性比10μM时的CAPE小,但具有相似的抗氧化活性,因此可以认为它们是很有前途的抗氧化剂。 图形摘要
Syntheses and Reactions of Pyrroline, Piperidine Nitroxide Phosphonates
Horner-Wadsworth-Emmons (HWE) reactions. The reaction of paramagnetic α-bromoketone produced a vinylphosphonate in the Perkow reaction. Paramagnetic α-hydroxyphosphonates could be subjected to oxidation, elimination and substitution reactions to produce various paramagnetic phosphonates. The synthesized paramagnetic phosphonates proved to be useful synthetic building blocks for carbon-carbon bond-forming reactions
Syntheses and utilizations of pyrroline and tetrahydropyridine nitroxide-based phosphonate esters, a phosphate ester and a bisphosphonate
作者:Tamás Kálai、Mostafa Isbera、Balázs Bognár、Cecília Sár、József Jekő、Kálmán Hideg
DOI:10.1080/10426507.2021.1989685
日期:2022.6.3
nitroxide-based allylic phosphonate esters, α-ketophosphonate esters were obtained from the corresponding paramagnetic allyl bromides and acyl chlorides respectively via the Arbuzov reactions. The α-hydroxyphosphonate esters were accessed by Pudovik reactions from the corresponding paramagnetic ketones and aldehydes. The β-ketophosphonate esters were obtained from the appropriate 1-alkynylphosphonate esters via