Synthesis of 3,4-dihydropyrimidin-2(1H)-ones and 1,4-dihydropyridines using ammonium carbonate in water
作者:Fatemeh Tamaddon、Zahra Razmi、Abbas Ali Jafari
DOI:10.1016/j.tetlet.2009.12.098
日期:2010.2
known and new3,4-dihydropyrimidin-2(1H)-ones and 1,4-dihydropyridines are prepared efficiently via Biginelli and Hantzsch reactionsusing ammonium carbonate in water. Competition between Biginelli and Hantzsch reactions is observed with pyridine carbaldehydes. Using this methodology, Hantzsch esters are synthesized in higher yields and purities than with other procedures without the use of a catalyst
Chemical compounds having ion channel blocking activity for the treatment of immune dysfunction
申请人:——
公开号:US20020119989A1
公开(公告)日:2002-08-29
The present invention relates to chemical compounds having inhibitory activity on an intermediate conductance Ca 2+ activated potassium channel (IK Ca), and the use of such compounds for the treatment or alleviation of diseases or conditions relating to immune dysfunction. Moreover, the invention relates to a method of screening a chemical compound for inhibitory activity on an intermediate conductance Ca 2+ activated potassium channel (IK Ca).
Synthesis of Some New Unsymmetrically Substituted 1,4-Dihydropyridines
作者:Hamid R. Memarian、Masumeh Abdoli-Senejani、Dietrich Döpp
DOI:10.1515/znb-2006-0110
日期:2006.1.1
5-unsymmetrically substituted1,4-dihydropyridines have been synthesized, which have ethoxycarbonyl and acetyl groups on 3- and 5-positions, respectively. A three-step procedure has been examined to increase the yield of the desired products, by suppressing the formation of the symmetrically substituted 3,5-diacetyl-1,4-dihydropyridines and 3,5-diethoxycarbonyl- 1,4-dihydropyridines.
Ionic Liquid [EMIM]OAc under Ultrasonic Irradiation towards Synthesis of 1,4-DHP's
作者:B. Palakshi Reddy、K. Rajesh、V. Vijayakumar
DOI:10.1002/jccs.201190041
日期:2011.6
The ionicliquid 1‐ethyl‐3‐methylimidazole acetate ([EMIM]OAc) was found to be a mild and effective catalyst for the efficient, one‐pot, three‐component synthesis of 1,4‐dihydropyridines from arylaldehydes, ethylacetoacetate/acetylacetone and ammonium acetate at room temperature under sonication. The developed method has many advantages, including devoid of harmful catalysts, reacting at room temperature
Ultrasound-mediated, uranyl nitrate hexahydrate-catalyzed synthesis of 1,4-dihydropyridines under mild conditions
作者:B. Palakshi Reddy、S. Sarveswari、V. Vijayakumar
DOI:10.1007/s11164-014-1784-5
日期:2015.9
Synthesis of 1,4-dihydropyridines by three-component condensation reaction of aldehyde, 1,3-dicarbonyl compounds, and ammonium acetate have been found to be efficiently catalyzed by uranylnitratehexahydrate [UO2(NO3)2 · 6H2O] at room temperature under ultrasound irradiation. This novel synthetic method offers the advantages of high yields, short reaction times, simplicity, and easy workup compared