3907-15-1Relevant academic research and scientific papers
Highly Efficient Fullerene-Free Organic Solar Cells Operate at Near Zero Highest Occupied Molecular Orbital Offsets
Li, Shuixing,Zhan, Lingling,Sun, Chenkai,Zhu, Haiming,Zhou, Guanqing,Yang, Weitao,Shi, Minmin,Li, Chang-Zhi,Hou, Jianhui,Li, Yongfang,Chen, Hongzheng
, p. 3073 - 3082 (2019)
Herein, we investigated a series of fullerene-free organic solar cells (OSCs) based on six different donor:acceptor (D:A) blends with varied highest occupied molecular orbital (HOMO) offsets from -0.05 to 0.21 eV. First, to verify the energetic compatibility of a specific D:A pair, especially for HOMO offsets, we established a simple method to estimate the hole transfer tendencies between D and A by using bilayer hole-only devices. It reveals that the asymmetrical diode effect of the bilayer hole-only devices can correlate with the FF and Jsc of the relevant OSCs. Second, to find out whether HOMO offset is the main restriction of hole transfer, we measured transient absorption spectra and examined the hole transfer behavior in the blends, revealing that the occurrence of hole transfer is independent of the HOMO offsets and ultrafast in the time scale of ≤4.6 ps for those blends with ≥0 eV HOMO offsets. In contrast, a negative HOMO offset can significantly slow down the hole transfer with a half-time of 400 ps. Furthermore, we compare the device parameters under varied light intensities and discover that the bimolecular recombination should be one of the main restrictions for high device performance. Surprisingly, small HOMO offsets of 0 and 0.06 eV can also enable high PCEs of 10.42% and 11.75% for blend 2 (PTQ10:HC-PCIC) and blend 3 (PBDB-TF:HC-PCIC), respectively. Overall, our work demonstrates not only the validity of high-performance OSCs operating at the near zero HOMO offsets but also the charge dynamic insights of these blends, which will help gain understanding on the further improvement of OSCs.
New acyl derivatives of 3-aminofurazanes and their antiplasmodial activities
Dolensky, Johanna,Hermann, Theresa,Hochegger, Patrick,Kaiser, Marcel,M?ser, Pascal,Saf, Robert,Seebacher, Werner,Weis, Robert
, (2021/05/24)
An N-acylated furazan-3-amine of a Medicines for Malaria Venture (MMV) project has shown activity against different strains of Plasmodium falciparum. Seventeen new derivatives were prepared and tested in vitro for their activities against blood stages of two strains of Plasmodium falciparum. Several structure–activity relationships were revealed. The activity strongly depended on the nature of the acyl moiety. Only benzamides showed promising activity. The substitution pattern of their phenyl ring affected the activity and the cytotoxicity of compounds. In addition, physicochemical parameters were calculated (log P, log D, ligand efficiency) or determined experimentally (permeability) via a PAMPA. The N-(4-(3,4-diethoxyphenyl)-1,2,5-oxadiazol-3-yl)-3(trifluoromethyl)benzamide possessed good physicochemical properties and showed high antiplasmodial activity against a chloroquine-sensitive strain (IC50 (NF54) = 0.019 μM) and even higher antiplasmodial activity against a multiresistant strain (IC50 (K1 ) = 0.007 μM). Compared to the MMV compound, the permeability and the activity against the multiresistant strain were improved.
COMPOUNDS, SALTS THEREOF AND METHODS FOR TREATMENT OF DISEASES
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Paragraph 00621-00623, (2019/03/12)
The present disclosure relates to compounds according to Formula (I), useful for treating diseases.
Synthesis of Sulfonated Carbofluoresceins for Voltage Imaging
Ortiz, Gloria,Liu, Pei,Naing, Su Htet Htet,Muller, Vikram R.,Miller, Evan W.
supporting information, p. 6631 - 6638 (2019/05/06)
We present the design, synthesis, and applications of a new class of voltage-sensitive fluorescent indicators built on a modified carbofluorescein scaffold. Carbofluoresceins are an attractive target for responsive probes because they maintain oxygen subs
Identification of Phenylpyrazolone Dimers as a New Class of Anti-Trypanosoma cruzi Agents
Sijm, Maarten,Siciliano de Araújo, Julianna,Ramos Llorca, Alba,Orrling, Kristina,Stiny, Lydia,Matheeussen, An,Maes, Louis,de Esch, Iwan J. P.,de Nazaré Correia Soeiro, Maria,Sterk, Geert Jan,Leurs, Rob
supporting information, p. 1662 - 1668 (2019/08/30)
Chagas disease is becoming a worldwide problem; it is currently estimated that over six million people are infected. The two drugs in current use, benznidazole and nifurtimox, require long treatment regimens, show limited efficacy in the chronic phase of infection, and are known to cause adverse effects. Phenotypic screening of an in-house library led to the identification of 2,2′-methylenebis(5-(4-bromophenyl)-4,4-dimethyl-2,4-dihydro-3H-pyrazol-3-one), a phenyldihydropyrazolone dimer, which shows an in vitro pIC50 value of 5.4 against Trypanosoma cruzi. Initial optimization was done by varying substituents of the phenyl ring, after which attempts were made to replace the phenyl ring. Finally, the linker between the dimer units was varied, ultimately leading to 2,2′-methylenebis(5-(3-bromo-4-methoxyphenyl)-4,4-dimethyl-2,4-dihydro-3H-pyrazol-3-one (NPD-0228) as the most potent analogue. NPD-0228 has an in vitro pIC50 value of 6.4 against intracellular amastigotes of T. cruzi and no apparent toxicity against the human MRC-5 cell line and murine cardiac cells.
Asymmetric Palladium-Catalyzed C-H Functionalization Cascade for Synthesis of Chiral 3,4-Dihydroisoquinolones
Sun, Manman,Wu, Haijian,Xia, Xiangyu,Chen, Weida,Wang, Zhiming,Yang, Jianguo
, p. 12835 - 12847 (2019/11/02)
A palladium-catalyzed C-H functionalization/intramolecular asymmetric allylation cascade of N-sulfonyl benzamides with 1,3-dienes has been developed. In the presence of a chiral pyridine-oxazoline ligand, this protocol enables the synthesis of chiral 3,4-dihydroisoquinolones in yields of up to 83% with enantioselectivities of up to 96%, using environmentally friendly air as the terminal oxidant.
Structural Basis for Achieving GSK-3β Inhibition with High Potency, Selectivity, and Brain Exposure for Positron Emission Tomography Imaging and Drug Discovery
Bernard-Gauthier, Vadim,Mossine, Andrew V.,Knight, Ashley,Patnaik, Debasis,Zhao, Wen-Ning,Cheng, Chialin,Krishnan, Hema S.,Xuan, Lucius L.,Chindavong, Peter S.,Reis, Surya A.,Chen, Jinshan Michael,Shao, Xia,Stauff, Jenelle,Arteaga, Janna,Sherman, Phillip,Salem, Nicolas,Bonsall, David,Amaral, Brenda,Varlow, Cassis,Wells, Lisa,Martarello, Laurent,Patel, Shil,Liang, Steven H.,Kurumbail, Ravi G.,Haggarty, Stephen J.,Scott, Peter J. H.,Vasdev, Neil
supporting information, p. 9600 - 9617 (2019/10/28)
Using structure-guided design, several cell based assays, and microdosed positron emission tomography (PET) imaging, we identified a series of highly potent, selective, and brain-penetrant oxazole-4-carboxamide-based inhibitors of glycogen synthase kinase-3 (GSK-3). An isotopologue of our first-generation lead, [3H]PF-367, demonstrates selective and specific target engagement in vitro, irrespective of the activation state. We discovered substantial ubiquitous GSK-3-specific radioligand binding in Tg2576 Alzheimer's disease (AD), suggesting application for these compounds in AD diagnosis and identified [11C]OCM-44 as our lead GSK-3 radiotracer, with optimized brain uptake by PET imaging in nonhuman primates. GSK-3β-isozyme selectivity was assessed to reveal OCM-51, the most potent (IC50 = 0.030 nM) and selective (>10-fold GSK-3β/GSK-3α) GSK-3β inhibitor known to date. Inhibition of CRMP2T514 and tau phosphorylation, as well as favorable therapeutic window against WNT/β-catenin signaling activation, was observed in cells.
Studies on phenothiazines: New microtubule-interacting compounds with phenothiazine A-ring as potent antineoplastic agents
Ghinet, Alina,Moise, Iuliana-Monica,Rigo, Beno?t,Homerin, Germain,Farce, Amaury,Dubois, Jo?lle,B?cu, Elena
, p. 2307 - 2317 (2016/04/26)
New phenothiazine derivatives 6-20 have been designed, synthesized and evaluated in vitro for their ability to inhibit tubulin polymerization and antiproliferative activity against 60 cancer cell lines, including several multi-drug resistant (MDR) tumor cell lines. The phenothiazine unit may successfully replace the classical 3,4,5-trimethoxyphenyle A ring of parent combretastatin A-4 or phenstatin, confirming previous studies. The most promising structural modulations have been realized on the B ring, the 2′-fluoro-4′-methoxy substitution in compound 6 and the 2′-trifluoromethyl-4′-methoxy substitution in compound 7 providing the best antitubulin and antitumor activity in the current study. Compounds 6-8 and 16 exhibited more important cell growth inhibition than parent phenstatin 2 on human colon Duke's type D, colorectal adenocarcinoma COLO 205 and on human kidney adenocarcinoma A498 cell lines. 10-Methylphenothiazine derivatives 19 and 20 did not show biological activity but exerted bright fluorescence and solvatochromism effects. These molecules deserve further chemical efforts in order to provide valuable tools for biophysical studies.
Fries rearrangement: Scalable synthesis of key fluoro building blocks 3-fluoro-4-methoxybenzoyl chloride and 1,2-diethoxy-3-fluorobenzene
Yerande, Swapnil G.,Shendage, Deepak M.,Wakchaure, Prasad B.,Phadtare, Ganesh R.,Bhoite, Madhavrao Y.,Gangopadhyay, Ashok Kumar,Nagarajan, Kuppuswamy,Rupp, Richard Helmut
, p. 2426 - 2429 (2014/05/06)
Lewis acid catalyzed Fries rearrangement of 2-fluorophenyl acetate (3) was performed on kg scale. The ortho 5 and para 4 isomers obtained were separated in an industrially feasible way. Compound 4 was then converted into fluorinated building block 3-fluoro-4-methoxybenzoyl chloride (1) while compound 5 was converted into 1,2-diethoxy-3-fluorobenzene (2) in high yields.
NOVEL ARYLALKENE DERIVATIVES AND USE THEREOF AS SELECTIVE ESTROGEN RECEPTOR MODULATORS
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, (2013/07/19)
The invention provides novel ethylene derivatives represented by Formula I, which may be used as selective estrogen receptor modulators (SERMs) and useful in the prophylaxis and/or treatment of estrogen-dependent conditions or conditions.
