Copper-catalyzed Cyclization of 3-Acylcoumarin Hydrazone using Air as the Oxidant: Efficient Synthesis of Pyrazole-Fused Coumarin Derivatives
作者:Hui-Yan Wang、Xue-Cheng Liu、Zhi-Bin Huang、Da-Qing Shi
DOI:10.1002/jhet.2052
日期:2015.3
3‐c]pyrazol‐4(1H)‐ones is reported. In this atom economic process, readily available 3‐acylcoumarin hydrazone is oxidative cyclized by direct C–N bond formation. Air has been successfully used as an oxidant, which has important economic and environmental advantages. A broad scope of 3‐acylcoumarin hydrazones can be utilized in this process.
据报道,高效,便捷的Cu催化形成了铬诺[4,3 - c ]吡唑-4(1 H)-酮。在这个原子经济过程中,容易获得的3酰基香豆素通过直接的C–N键形成而被氧化环化。空气已成功地用作氧化剂,具有重要的经济和环境优势。在此过程中,可以使用各种3-酰基香豆素。
One-Pot Cascade Access to Ru(II)-Catalyzed Regioselective C(sp<sup>2</sup>)-H Activation/Alkenylation of Chromeno[4,3-<i>c</i>]pyrazol-4-ones and Their Emission Solvatochromic Studies
作者:Dinesh Singla、Kamaldeep Paul
DOI:10.1021/acs.joc.2c02130
日期:2022.12.16
Herein, one-pot cascade synthesis of chromeno[4,3-c]pyrazol-4-ones and their Ru(II)-catalyzed regioselective ortho-alkenylation using imine as a weak directing group are done with moderate to good yields. The reaction proceeds through a three-step domino process during which intermediates are also isolated in excellent yields. In addition, this methodology generates a number of interesting fluorophores
在此,使用亚胺作为弱导向基团的一锅法级联合成 chromeno[4,3 - c ]pyrazol-4-ones 及其 Ru(II) 催化的区域选择性邻位烯基化反应具有中等至良好的收率。反应通过三步多米诺骨牌过程进行,在此过程中中间体也以优异的产率分离。此外,该方法还产生了许多具有供体和受体基团的有趣荧光团,这些荧光团显示出正溶剂化显色现象。
Synthesis, anticancer activity and photophysical properties of novel substituted 2-oxo-2H-chromenylpyrazolecarboxylates
2-Oxo-2H-chromenylpyrazolecarboxylates (8a-h and 12a-zb) have been synthesized by [3 + 2] cycloaddition of 2H-chromenophenylhydrazones (7a-h and 11a-w) with diethyl/dimethylbut-2-ynedioates. Phenylchromeno[4,3-c]pyrazol-4(1H)-ones (13i-n) were prepared from corresponding phenylhydrazones (7a-h) with catalytic amount of piperidine in presence of pyridine as a solvent at 100 degrees C. All the synthesized compounds (8a-h, 12a-zb and 13a-n) were screened for anticancer activity against three human cancer cell lines such as prostate (DU-145), lung adenocarcinoma (A549), and cervical (HeLa) by standard MTT assay method. Further, photophysical properties (UV and fluorescence) for these compounds were discussed. (C) 2013 Elsevier Masson SAS. All rights reserved.