Synthesis and characterization of fluorescent 4,6-disubstituted-3-cyano-2-methylpyridines
摘要:
4,6-Disubstituted-3-cyano-2-methylpyridines, easily prepared by treating alpha,beta-unsaturated carbonyl compounds with beta-aminocrotononitrile in the presence of potassium tert-butoxide, have been found to show intense fluorescence in the region of 400-552 nm. 3-Cyano-4,6-bis(4-methoxyphenyl)-and 3-cyano-4,6-di(2-furyl)-2-methylpyridines show more intense fluorescence than 7-diethylamino-4-methylcoumarin. The 3-cyano group of pyridines increases the fluorescence intensities and improves photostabilities.
1,4-pentandien-3-ones, XXXII: Reaction of 2-acetylthiophene and 2-acetylfuran with malononitrile and aldehydes, and synthesis and properties of phenylene-bis [(thienyl/furyl)nicotinonitrile] derivative
作者:Lutz Greiner-Bechert、Hans-Hartwig Otto
DOI:10.1002/ardp.2503240908
日期:——
(1b) with aldehydes. The Michael adducts 5/6 are obtained from 3/4 by reaction with malononitrile/LDA in THF at −78°C, or in DMSO with NaH at room temp. Reaction of 3/4 with malononitrile and methylate in methanol yielded the substituted nicotinonitriles 7/8. From terephthalaldehyde, the diketones 9 are prepared, which yield with malononitrile the phenylene‐bis[(thienyl/furyl)nicotinonitrile] derivatives
Synthesis and biologic activities of some novel heterocyclic chalcone derivatives
作者:Punita Sharma、Suresh Kumar、Furquan Ali、Sumati Anthal、Vivek K. Gupta、Inshad A. Khan、Surjeet Singh、Payare L. Sangwan、Krishan A. Suri、Bishan D. Gupta、Devinder K. Gupta、Prabhu Dutt、Ram A. Vishwakarma、Naresh K. Satti
DOI:10.1007/s00044-012-0401-7
日期:2013.8
25, and 26 showed promising anticancer activity in all four tested cancer cell lines (HL-60, MOLT-4, PC-3, and HeLa). Compound 25 emerged as a very good potentiator of ciprofloxacin against multidrug resistant S. aureus and also showed promising anticancer activity. The present communication describes syntheses, bio-evaluation, and structure-related activity of the (E)-3-(substitutedphenyl)-1-hetrylprop-2-en-1-ones
Notably, the introduction of three methoxy groups at positions 3, 4, 5 on ring B appears to be critical for cytotoxicity. The best compound, with potent and selective cytotoxicity (IC50 = 12.51 μM in comparison with the value 10.84 μM of paclitaxel), contains a phenothiazine moiety on ring A and a thiophene heterocycle on ring B. Most of the potential compounds only show weak cytoxicity on the noncancerous
作者:Lutz Greiner-Bechert、Thomas Sprang、Hans-Hartwig Otto
DOI:10.1007/s00706-004-0265-8
日期:2005.4
Heteroaryl substituted cyclopropyl ketones were prepared by reactions with Me 3SO+ I+, and by reaction with Lewis acids they were transformed into substituted dihydrobenzo[ b ]furanone or -thiophenone, or γ-hydroxy ketones. Cycloadditions with thiophene derivatives allowed the synthesis of substituted benzo[ b ]thiophene derivatives, but with poor yields. Structures and stereochemistry were established mainly
噻吩基和呋喃基丙烯酮与丙二酸酯,氰基乙酸酯和丙二腈反应,生成可环化为杂芳基取代的二氢吡喃,环己醇和哌啶酮的加成产物。杂芳基取代的环丙基酮是通过与 Me 3 SO + I +反应制备的 ,并且通过与 路易斯 酸反应,将 它们转化为取代的二氢苯并[ b ]呋喃酮或-噻吩酮或γ-羟基酮。与噻吩衍生物的环加成可以合成取代的苯并[ b ]噻吩衍生物,但收率很低。主要通过NMR光谱确定结构和立体化学。
Detection of uronium salts
申请人:Almog Joseph
公开号:US20060084176A1
公开(公告)日:2006-04-20
Methods and kits for colorimetric identification of uronium salts, such as explosives.