- Design, synthesis and anticandidal evaluation of indazole and pyrazole derivatives
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Candidiasis, caused by yeasts of the genus Candida, is the second cause of superficial and mucosal infections and the fourth cause of bloodstream infections. Although some antifungal drugs to treat candidiasis are available, resistant strains to current therapies are emerging. Therefore, the search for new candicidal compounds is certainly a priority. In this regard, a series of indazole and pyrazole derivatives were designed in this work, employing bioisosteric replacement, homologa-tion, and molecular simplification as new anticandidal agents. Compounds were synthesized and evaluated against C. albicans, C. glabrata, and C. tropicalis strains. The series of 3-phenyl-1H-indazole moiety (10a–i) demonstrated to have the best broad anticandidal activity. Particularly, compound 10g, with N,N-diethylcarboxamide substituent, was the most active against C. albicans and both miconazole susceptible and resistant C. glabrata species. Therefore, the 3-phenyl-1H-indazole scaf-fold represents an opportunity for the development of new anticandidal agents with a new chemo-type.
- Rodríguez-Villar, Karen,Hernández-Campos, Alicia,Yépez-Mulia, Lilián,Sainz-Espu?es, Teresita Del Rosario,Soria-Arteche, Olivia,Palacios-Espinosa, Juan Francisco,Cortés-Benítez, Francisco,Leyte-Lugo, Martha,Varela-Petrissans, Bárbara,Quintana-Salazar, Edgar A.,Pérez-Villanueva, Jaime
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- Preparation method of 5-piperazinyl-3-methyl-1-phenylpyrazole
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The invention discloses a preparation method of a Teneligliptin key intermediate 5-piperazinyl-3-methyl-1-phenylpyrazole, and belongs to the technical field of pharmaceutical manufacturing. Accordingto the preparation method disclosed by the invention, 3-
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Paragraph 0033; 0034; 0035; 0036
(2018/06/15)
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- Direct Transformation of Arylamines to Aryl Halides via Sodium Nitrite and N-Halosuccinimide
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A one-pot universal approach for transforming arylamines to aryl halides via reaction with sodium nitrite (NaNO2) and N-halosuccinimide (NXS) in DMF at room temperature under metal- and acid-free condition is described. This new protocol that is complementary to the Sandmeyer reaction, is suggested to involve the in situ generation of nitryl halide induce nitrosylation of aryl amine to form the diazo intermediate which is halogenated to furnish the aryl halide.
- Mukhopadhyay, Sushobhan,Batra, Sanjay
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supporting information
p. 14622 - 14626
(2018/09/21)
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- Structure-activity relationships of pyrazole derivatives as potential therapeutics for immune thrombocytopenias
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Idiopathic or immune thrombocytopenia (ITP) is a serious clinical disorder involving the destruction of platelets by macrophages. Small molecule therapeutics are highly sought after to ease the burden on current therapies derived from human sources. Earlier, we discovered that dimers of five-membered heterocycles exhibited potential to inhibit phagocytosis of human RBCs by macrophages. Here, we reveal a structure-activity relationship of the bis-pyrazole class of molecules with -C-C-, -C-N- and -C-O- linkers, and their evaluation as inhibitors of phagocytosis of antibody-opsonized human RBCs as potential therapeutics for ITP. We have uncovered three potential candidates, 37, 47 and 50, all carrying a different linker connecting the two pyrazole moieties. Among these compounds, hydroxypyrazole derivative 50 is the most potent compound with an IC50 of 14 ± 9 μM for inhibiting the phagocytosis of antibody-opsonized human RBCs by macrophages. None of the compounds exhibited significant potential to induce apoptosis in peripheral blood mononuclear cells (PBMCs). Current study has revealed specific functional features, such as up to 2-atom spacer arm and alkyl substitution at one of the N1 positions of the bivalent pyrazole core to be important for the inhibitory activity.
- Purohit, Meena K.,Chakka, Sai Kumar,Scovell, Iain,Neschadim, Anton,Bello, Angelica M.,Salum, Norue,Katsman, Yulia,Bareau, Madeleine C.,Branch, Donald R.,Kotra, Lakshmi P.
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p. 2739 - 2752
(2014/05/06)
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- PYRAZOLE DERIVATIVES AND THEIR USES THEREOF
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The present disclosure relates to a compound of formula (I) or a pharmaceutically acceptable salt thereof; wherein U, R1, R2, R3 and Q are as defined herein. The disclosure also provides a method for treating or preventing a method for the prevention, treatment and/or alleviation of one or more autoimmune or alloimmune disease, pharmaceutical compositions and combination comprising a therapeutically effective amount of a compound, as defined herein.
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Page/Page column 15; 16
(2014/09/29)
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- Pyrazolin-5-ylidene palladium(II) complexes: Synthesis, characterization, and application in the direct arylation of pentafluorobenzene
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Ten palladium(II) complexes bearing a pyrazolin-5-ylidene ligand have been synthesized by oxidative addition and silver carbene transfer pathways. The weakly bound acetonitrile ligand in the initially obtained trans-[PdBr 2(MeCN)(Pyry)] complex (6, Pyry = 1-phenyl-2,3-dimethylpyrazolin-5- ylidene) could be replaced by other donor ligands, and additional NHC ligands were introduced either by silver carbene transfer reactions or via reaction with in situ generated free carbenes. Using our previously reported 13C NMR-based electronic parameter, the pyrazolin-5-ylidene ligand is estimated to be among the most strongly donating ligands on our scale so far. The complexes obtained were employed as catalysts for the direct arylation of pentafluorobenzene with moderate to good yields under optimized conditions.
- Bernhammer, Jan C.,Huynh, Han Vinh
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experimental part
p. 5121 - 5130
(2012/09/05)
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- Sonogashira coupling offers a new synthetic route to thieno[2,3-c]pyrazoles
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1,3-Disubstituted-5-chloro-4-iodopyrazoles are selectively coupled with phenylacetylene under typical Sonogashira reaction conditions [PdCl 2(PPh3)2, CuI, Et3N, dimethylformamide (DMF)] to obtain the correspondi
- Eller, Gernot A.,Vilkauskaite, Gyte,Arbaciauskiene, Egle,Sackus, Algirdas,Holzer, Wolfgang
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experimental part
p. 541 - 547
(2011/04/22)
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