CBr<sub>4</sub> as a Halogen Bond Donor Catalyst for the Selective Activation of Benzaldehydes to Synthesize α,β-Unsaturated Ketones
作者:Imran Kazi、Somraj Guha、Govindasamy Sekar
DOI:10.1021/acs.orglett.7b00348
日期:2017.3.3
CBr4 has been employed as a halogen bond donor catalyst for the selective activation of aldehyde, to achieve an efficient solvent- and metal-free C═C bond forming reaction in the presence of strong acid sensitive groups such as methoxy, cyanide, ester, and ketal for the synthesis of α,β-unsaturated ketones. This unique capability of CBr4 to act as a halogen bond donor has been explored and established
From Celecoxib to a Novel Class of Phosphodiesterase 5 Inhibitors: Trisubstituted Pyrazolines as Novel Phosphodiesterase 5 Inhibitors with Extremely High Potency and Phosphodiesterase Isozyme Selectivity
作者:Mohammad Abdel-Halim、Sara Sigler、Nora A. S. Racheed、Amr Hefnawy、Reem K. Fathalla、Mennatallah A. Hammam、Ahmed Maher、Yulia Maxuitenko、Adam B. Keeton、Rolf W. Hartmann、Matthias Engel、Gary A. Piazza、Ashraf H. Abadi
DOI:10.1021/acs.jmedchem.0c01120
日期:2021.4.22
trisubstituted pyrazoline scaffold derived from the COX2 inhibitor, celecoxib, was used to develop novel PDE5 inhibitors. Novel pyrazolines were identified with potent PDE5 inhibitory activity lacking COX2 inhibitory activity. Compound d12 was the most potent with an IC50 of 1 nM, which was three times more potent than sildenafil and more selective with a selectivity index of >10,000-fold against all other PDE
Microwave synthesis, characterization and bio-efficacy evaluation of novel chalcone based 6-carbethoxy-2-cyclohexen-1-one and 2H-indazol-3-ol derivatives
作者:N.A. Shakil、Manish K. Singh、M. Sathiyendiran、J. Kumar、Jasdeep C. Padaria
DOI:10.1016/j.ejmech.2012.10.038
日期:2013.1
chalcones. Whereas, all the Indazole derivatives showed very good anti-oxidant activity and some were also found to be active as anti-bacterialagent. Among the screened compounds, 15 was found to be most active as anti-fungal agent (against Rhizoctonia solani, LC50 = 2.36 μg mL−1), 15b was found to be most active anti-bacterialagent (against Klebsiella pneumonia, MIC = 24.68 μg mL−1) and 14b emerged
合成了基于查尔酮的新型6-乙氧基-2-环己烯-1-酮和2H-吲哚-3-醇衍生物,并使用诸如IR,1 H NMR,13 C NMR,COSY,DEPT和GC-MS等光谱技术对其进行了表征。筛选所有这些化合物的抗真菌,抗细菌和抗氧化活性。通常,环己烯酮衍生物显示出比亲代查尔酮更好的抗真菌和抗菌活性。然而,所有的吲唑衍生物均显示出非常好的抗氧化活性,并且还发现一些具有抗菌活性。在筛选出的化合物中,发现有15种最有效作为抗真菌剂(相对于立枯丝核菌,LC 50 = 2.36μgmL -1),发现15b是最具活性的抗菌剂(针对肺炎克雷伯菌,MIC = 24.68μgmL -1),而14b则是最具活性的抗氧化剂(IC 50 = 19.81μgmL -1)。
13C nuclear magnetic resonance studies on 1,3-diphenylprop-2-enones
作者:V. S. Parmar、Sunil Sharma、J. S. Rathore、Meenu Garg、Sandhya Gupta、Sunita Malhotra、V. K. Sharma、Suddham Singh、P. M. Boll
DOI:10.1002/mrc.1260280516
日期:1990.5
The 13C NMR spectra of 48 differently substituted chalcones (1,3‐diphenylprop‐2 enones) have been recorded and the results are discussed. The data will be useful in the identification of new/natural chalcones.
Design, synthesis and biological evaluation of oxygenated chalcones as potent and selective MAO-B inhibitors
作者:Della Grace Thomas Parambi、Jong Min Oh、Seung Cheol Baek、Jae Pil Lee、Anna Rita Tondo、Orazio Nicolotti、Hoon Kim、Bijo Mathew
DOI:10.1016/j.bioorg.2019.103335
日期:2019.12
addition, most of the derivatives potently inhibited MAO-A and O6 was the most potent inhibitor with an IC50 value of 0.029 µM, followed by O3, O4, O9, and O2 (IC50 = 0.035, 0.053, 0.072, and 0.082 µM, respectively). O23 had a high selectivity index (SI) value for MAO-B of 138.1, and O20 (IC50 value for MAO-B = 0.010 µM) had an extremely high SI of >4000. In dialysis experiments, inhibitions of MAO-A and