共查询到19条相似文献,搜索用时 62 毫秒
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在离子液体和氟化钾反应体系中,研究了卤代哒嗪化合物的氟代反应,讨论了微波辐射条件下由卤代哒嗪化合物合成氟代哒嗪化合物的方法。用离子液体作为反应介质替代了传统的分子溶剂,提高了产物收率,简化了操作。用微波反应不仅获得了较好的收率,也缩短了反应时间。利用离子液体和微波辐射条件进行氟代反应是一种绿色化学方法。 相似文献
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氟代哒嗪类化合物与有一定生理活性的氟代嘧啶类化合物有着同分异构的关系。而4-氟-3,6-二氯哒嗪又是合成其它药物的重要中间体。1984年田官荣报道了4-氟-3,6-二氯哒嗪的合成及同亲核试剂的反应性能和同类化合物 相似文献
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4—氟—3—羟基—1—取代苯基—6—哒嗪酮类结构及其反应的研究 总被引:2,自引:0,他引:2
氟代马来酐和苯肼缩合,反应先在乙醚后在25%盐酸中进行。4-氟-3-羟基-1-苯基-6-哒嗪酮(Ⅰ)的收率达54%,文献仅26%。Ⅰ和吗啡啉反应,得熔点为243~244℃的白色晶体。熔点及元素分析结果(表1)表明,产物为4-吗啡啉基-3-羟基-1-苯基-6-哒嗪酮(Ⅱ),据此作者认为氟原子位于第4位。 相似文献
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Michael R. C. Gerstenberger Alois Haas 《Angewandte Chemie (International ed. in English)》1981,20(8):647-667
Since the days of the “Manhattan Project” our knowledge of the chemistry of fluorine-con-taining compounds has increased tremendously. At first only considered out of curiosity, this area of research bordering between inorganic and organic chemistry has developed from modest beginnings to such a complexity of interesting ramifications that it would be very difficult to review all aspects in detail. The motivating force behind the developments in this field were, above all, the unusual properties the numerous compounds acquire on introduction of fluorine substituents. The spectrum of unusual modes of behavior extend from extreme stabilization in fluorine-containing polymers and blood-substitutes to drastic increases in reactivity in pharmacologically and phytomedicinally active substances and in dyes. Moreover, one physical peculiarity of the fluorine atom, its magnetic moment, opens a new route to the decyphering of metabolic processes.—Parallel to the ever increasing number of fluorinated compounds there has been a concomitant increase in the variety of methods of synthesis and reagents, which is frequently difficult to overview in entirety, even for the specialists. Older, simple methods such as halogen metathesis with metal fluorides and electrofluorination are being refined as far as higher selectivity is concerned, and completely new, very reactive substances such as hypofluorites and noble-gas fluorides enable fascinating reactions on complex substrates, e. g. steroids and nucleobases. The present review is an attempted documentation and classification of the methods as well as a critical appraisal, not least from the standpoint of efficiency and economic aspects. 相似文献
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离子液体作为一类新型绿色溶剂,具有制备简单、稳定性好、溶解能力强、挥发性小、安全性强等优点,因此在有机单元反应包括酯化、氧化、还原、重排反应等中的应用相当广泛,有着十分诱人的应用前景.虽然其在氟化反应中的应用研究开始得较晚,但发展很快,目前在重氮化氟化、亲核氟化、亲电氟化以及电化学氟化等方面都取得了较大的进展.本文综述了近年来离子液体在氟化反应中应用的最新进展情况,并对其未来发展方向和应用前景进行了展望. 相似文献
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MinMinSHI HongZhengCHEN JingZhiSUN JianYE MangWANG 《中国化学快报》2004,15(5):575-578
The effect of fluorination on the aggregate structure of a novel fluorinated perylene diimide, N, N‘-diperfluorophenyl-3, 4, 9, 10-perylenetetracarboxylic diimide 1, was investigated by UV-Vis absorptions and the conformation simulations from AM1 semi-empirical quantum mechanics modeling. The results showed that in the solid film 1 molecules stacked with the perfluorinated phenyl groups straightly over or below the perylene cores of the adjacent 1 molecules. 相似文献
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The utility of ionic liquids for fluorination using 2,2-difluoro-1,3-dimethylimidazolidine (DFI) is described. Further, the fluorination of chiral epoxyalcohols gave the chiral monofluoromethylated epoxides. 相似文献
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Jean-Claude Jacquesy Christian BerrierMarie-Paule Jouannetaud Fabien ZuninoJacques Fahy Alain DuflosJean-Paul Ribet 《Journal of fluorine chemistry》2002,114(2):139-141
In HF-SbF5, reaction of various alkaloids with NBS, NCS, H2O2 yields fluoroderivatives: anti-addition is observed at the C6C7 double bond with tabersonine, but a more complex reaction is operative with vindoline, leading to 7-substituted (Br, Cl, OH)-20-fluoro derivatives. A completely different reaction pathway is observed with bis indole alkaloids (vinblastine, anhydrovinblastine, vinorelbine) in HF-SbF5. In the presence of NBS (or better of CCl4 or CHCl3), 20′,20′-difluoroderivatives are obtained. Vinflunine (20′,20′-difluoro-3′,4′-dihydrovinorelbine) has been selected for its promising antitumor activity. 相似文献
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Dr. Zhong Wang Hannah R. Felstead Robert I. Troup Prof. Bruno Linclau Dr. Philip T. F. Williamson 《Angewandte Chemie (International ed. in English)》2023,62(21):e202301077
Bioactive compounds generally need to cross membranes to arrive at their site of action. The octanol-water partition coefficient (lipophilicity, logPOW) has proven to be an excellent proxy for membrane permeability. In modern drug discovery, logPOW and bioactivity are optimized simultaneously, for which fluorination is one of the relevant strategies. The question arises as to which extent the often subtle logP modifications resulting from different aliphatic fluorine-motif introductions also lead to concomitant membrane permeability changes, given the difference in molecular environment between octanol and (anisotropic) membranes. It was found that for a given compound class, there is excellent correlation between logPOW values with the corresponding membrane molar partitioning coefficients (logKp); a study enabled by novel solid-state 19F NMR MAS methodology using lipid vesicles. Our results show that the factors that cause modulation of octanol-water partition coefficients similarly affect membrane permeability. 相似文献
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The ground state rotational spectrum of 2, 3, 6-trifluoropyridine has been investigated in the 2.0\begin{document}$ - $\end{document} 20.0 GHz region by pulsed jet Fourier transform microwave spectroscopy. The experimental rotational constants are \begin{document}$ A $\end{document} = 3134.4479(2) MHz, \begin{document}$ B $\end{document} = 1346.79372(7) MHz, and \begin{document}$ C $\end{document} = 941.99495(6) MHz. The transitions are so intense that rotational transitions of all mono-\begin{document}$ ^{13} $\end{document} C and \begin{document}$ ^{15} $\end{document} N isotopologues are measured in natural abundance. The semi-experimental equilibrium rotational constants of the 7 isotopologues were derived by taking account of the anharmonic vibrational corrections, which allowed a semi-experimental determination of the equilibrium structure of 2, 3, 6-trifluoropyridine. 相似文献
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本文以前文为基础测定了不同氟化剂存在下杂质元素的蒸发率,计算了弧温、电子密度以及杂质元素的电离度,研究了影响元素谱线强度的诸因素,用晶体X射线衍射分析了电极反应残留物,提出了氟化反应的机理,并通过热力学计算予以说明。 1实验部分 1.1 仪器及主要工作条件 HILGER WATTS大型棱镜摄谱仪,直流电弧光源,电流10 相似文献