42754-56-3Relevant articles and documents
Synthesis of 2,5,7-triaryl-4,7(6,7)-dihydropyrazolo[1,5-a]pyrimidine-3- carbonitriles by reaction of 5(3)-amino-3(5)-aryl-1H-pyrazole-4-carbonitriles with chalcones
Kolosov, Maksim A.,Beloborodov, Dmitriy A.,Kulyk, Olesia G.,Orlov, Valeriy D.
, p. E89-E92 (2014)
The reaction of 5(3)-amino-3(5)-aryl-1H-pyrazole-4-carbonitriles with 1,3-diaryl-2-propen-1-ones (chalcones) in refluxing DMF leads to 2,5,7-triaryl-4,7(6,7)-dihydropyrazolo[1,5-a]pyrimidine-3-carbonitriles. In DMSO solution, the latter exist in equilibri
Condensation of 2-((Alkylthio)(aryl)methylene)malononitrile with 1,2-Aminothiol as a Novel Bioorthogonal Reaction for Site-Specific Protein Modification and Peptide Cyclization
Gao, Wei,Li, Xuefei,Li, Zhuoru,Luk, Louis Y. P.,Meng, Xiaoting,Tsai, Yu-Hsuan,Wu, Chuanliu,Zhao, Yibing,Zheng, Xiaoli
supporting information, (2020/03/16)
Site-specific modification of peptides and proteins has wide applications in probing and perturbing biological systems. Herein we report that 1,2-aminothiol can react rapidly, specifically and efficiently with 2-((alkylthio)(aryl)methylene)malononitrile (TAMM) under biocompatible conditions. This reaction undergoes a unique mechanism involving thiol-vinyl sulfide exchange, cyclization, and elimination of dicyanomethanide to form 2-aryl-4,5-dihydrothiazole (ADT) as a stable product. An 1,2-aminothiol functionality can be introduced into a peptide or a protein as an N-terminal cysteine or an unnatural amino acid. The bioorthogonality of this reaction was demonstrated by site-specific labeling of not only synthetic peptides and a purified recombinant protein but also proteins on mammalian cells and phages. Unlike other reagents in bioorthogonal reactions, the chemical and physical properties of TAMM can be easily tuned. TAMM can also be applied to generate phage-based ADT-cyclic peptide libraries without reducing phage infectivity. Using this approach, we identified ADT-cyclic peptides with high affinity to different protein targets, providing valuable tools for biological studies and potential therapeutics. Furthermore, the mild reaction conditions of TAMM condensation warrant its use with other bioorthogonal reactions to simultaneously achieve multiple site-specific modifications.
Simple access to highly functional bicyclic γ- and δ-lactams: Origins of chirality transfer to contiguous tertiary/quaternary stereocenters assessed by DFT
Le Goff, Ronan,Martel, Arnaud,Sanselme, Morgane,Lawson, Ata Martin,Dach, Adam,Comesse, Sbastien
supporting information, p. 2966 - 2979 (2015/02/19)
This paper describes the synthesis of both polysubstituted oxazolo-pyrrolidinones and -piperidinones by a domino process. The methodology is based on the reaction between hydroxyl halogenoamides and Michael acceptors, which leads efficiently to bicyclic lactams. The process is compatible with unsymmetrical electron-withdrawing groups on the Michael acceptor, which allows the formation of two contiguous and fully controlled tertiary and quaternary stereocenters. In the case of tetrasubstituted Michael acceptors, two adjacent quaternary stereocenters are formed in good yield. Starting from (R)-phenylglycinol derived amides results in the formation of enantioenriched bicyclic lactams in low to good yields and with high levels of stereo-selectivity, thus greatly increasing the scope and interest of this strategy. The origins of chirality transfer and diastereoselectivity were studied by DFT calculations and have been attributed to a kinetic control in one of the last two steps of the reaction sequence. This selectivity is dependent upon both the substituents on the Michael acceptor and the sodium cation chelation.
Studies on the ATP Binding Site of Fyn Kinase for the Identification of New Inhibitors and Their Evaluation as Potential Agents against Tauopathies and Tumors
Tintori, Cristina,La Sala, Giuseppina,Vignaroli, Giulia,Botta, Lorenzo,Fallacara, Anna Lucia,Falchi, Federico,Radi, Marco,Zamperini, Claudio,Dreassi, Elena,Dello Iacono, Lucia,Orioli, Donata,Biamonti, Giuseppe,Garbelli, Mirko,Lossani, Andrea,Gasparrini, Francesca,Tuccinardi, Tiziano,Laurenzana, Ilaria,Angelucci, Adriano,Maga, Giovanni,Schenone, Silvia,Brullo, Chiara,Musumeci, Francesca,Desogus, Andrea,Crespan, Emmanuele,Botta, Maurizio
, p. 4590 - 4609 (2015/06/30)
Fyn is a member of the Src-family of nonreceptor protein-tyrosine kinases. Its abnormal activity has been shown to be related to various human cancers as well as to severe pathologies, such as Alzheimer's and Parkinson's diseases. Herein, a structure-based drug design protocol was employed aimed at identifying novel Fyn inhibitors. Two hits from commercial sources (1, 2) were found active against Fyn with Ki of about 2 μM, while derivative 4a, derived from our internal library, showed a Ki of 0.9 μM. A hit-to-lead optimization effort was then initiated on derivative 4a to improve its potency. Slightly modifications rapidly determine an increase in the binding affinity, with the best inhibitors 4c and 4d having Kis of 70 and 95 nM, respectively. Both compounds were found able to inhibit the phosphorylation of the protein Tau in an Alzheimer's model cell line and showed antiproliferative activities against different cancer cell lines. (Chemical Equation Presented).
1,3-disubstituted-4-aminopyrazolo [3, 4-d] pyrimidines, a new class of potent inhibitors for phospholipase D
Kulkarni, Aditya,Quang, Phong,Curry, Victoriana,Keyes, Renee,Zhou, Weihong,Cho, Hyejin,Baffoe, Jonathan,T?r?k, Béla,Stieglitz, Kimberly
, p. 270 - 281 (2014/10/15)
Phospholipase D enzymes cleave lipid substrates to produce phosphatidic acid, an important precursor for many essential cellular molecules. Phospholipase D is a target to modulate cancer-cell invasiveness. This study reports synthesis of a new class of phospholipase D inhibitors based on 1,3-disubstituted-4-amino-pyrazolopyrimidine core structure. These molecules were synthesized and used to perform initial screening for the inhibition of purified bacterial phospholipase D, which is highly homologous to the human PLD1. Initially tested with the bacterial phospholipase D enzyme, then confirmed with the recombinant human PLD1 and PLD2 enzymes, the molecules presented here exhibited inhibition of phospholipase D activity (IC50) in the low-nanomolar to low-micromolar range with both monomeric substrate diC4PC and phospholipid vesicles and micelles. The data strongly indicate that these inhibitory molecules directly block enzyme/vesicle substrate binding. Preliminary activity studies using recombinant human phospholipase Ds in in vivo cell assays measuring both transphosphatidylation and head-group cleavage indicate inhibition in the mid- to low-nanomolar range for these potent inhibitory novel molecules in a physiological environment. This study reports synthesis of a new class of PLD inhibitors based on 1,3-disubstituted-4-amino-pyrazolopyrimidine core structure. These molecules exhibited inhibition of human recombinant PLD activity (IC 50) in the low-nanomolar to low-micromolar range with monomeric substrate diC4PC and phospholipid vesicles and micelles. Preliminary activity studies using recombinant human PLDs in in vivo cell assays measuring both transphosphatidylation and head-group cleavage indicates inhibition in the mid- to low-nanomolar range for these potent inhibitory novel molecules in a physiological environment.
Pyrazolo[3,4-d]pyrimidine analogues: Synthesis, characterization and their in vitro antiamoebic activity
Siddiqui, Shadab Miyan,Salahuddin, Attar,Azam, Amir
, p. 775 - 781 (2013/04/10)
Pyrazolo[3,4-d]pyrimidine analogues were synthesized by treating 3-phenyl-1H-pyrazolo[3,4-d]pyrimidine-4-amine with different sulfonyl chlorides and triethylamine in dry dichloromethane. The structure of all the compounds was elucidated by spectral data a
Synthesis of 3-phenylpyrazolopyrimidine-1,2,3-triazole conjugates and evaluation of their Src kinase inhibitory and anticancer activities
Kumar, Anil,Ahmad, Israr,Chhikara, Bhupender S.,Tiwari, Rakesh,Mandal, Deendayal,Parang, Keykavous
body text, p. 1342 - 1346 (2011/04/16)
A series of two classes of 3-phenylpyrazolopyrimidine-1,2,3-triazole conjugates were synthesized using click chemistry approach. All compounds were evaluated for inhibition of Src kinase and human ovarian adenocarcinoma (SK-Ov-3), breast carcinoma (MDA-MB
A small molecule inhibitor selective for a variant ATP-binding site of the chaperonin GroEL
Chapman, Eli,Farr, George W.,Furtak, Krystyna,Horwich, Arthur L.
scheme or table, p. 811 - 813 (2009/09/25)
The chaperonin GroEL is a megadalton-sized molecular machine that plays an essential role in the bacterial cell assisting protein folding to the native state through actions requiring ATP binding and hydrolysis. A combination of medicinal chemistry and genetics has been employed to generate an orthogonal pair, a small molecule that selectively inhibits ATPase activity of a GroEL ATP-binding pocket variant. An initial screen of kinase-directed inhibitors identified an active pyrazolo-pyrimidine scaffold that was iteratively modified and screened against a collective of GroEL nucleotide pocket variants to identify a cyclopentyl carboxamide derivative, EC3016, that specifically inhibits ATPase activity and protein folding by the GroEL mutant, I493C, involving a side chain positioned near the base of ATP. This orthogonal pair will enable in vitro studies of the action of ATP in triggering activation of GroEL-mediated protein folding and might enable further studies of GroEL action in vivo. The approach originated for studying kinases by Shokat and his colleagues may thus also be used to study large macromolecular machines.
Synthesis and biological evaluation of 1-aryl-4,5-dihydro-1H-pyrazolo[3,4- d]pyrimidin-4-one inhibitors of cyclin-dependent kinases
Markwalder, Jay A.,Arnone, Marc R.,Benfield, Pamela A.,Boisclair, Michael,Burton, Catherine R.,Chang, Chong-Hwan,Cox, Sarah S.,Czerniak, Philip M.,Dean, Charity L.,Doleniak, Deborah,Grafstrom, Robert,Harrison, Barbara A.,Kaltenbach III, Robert F.,Nugiel, David A.,Rossi, Karen A.,Sherk, Susan R.,Sisk, Lisa M.,Stouten, Pieter,Trainor, George L.,Worland, Peter,Seitz, Steven P.
, p. 5894 - 5911 (2007/10/03)
Using a high-throughput screening strategy, a series of 1-aryl-4,5-dihydro-1H-pyrazolo[3,4-d]-pyrimidin-4-ones was identified that inhibit the cyclin-dependent kinase (CDK) 4/cyclin D1 complex-mediated phosphorylation of a protein substrate with IC50
Inhibitor scaffolds as new allele specific kinase substrates
Kraybill, Brian C.,Elkin, Lisa L.,Blethrow, Justin D.,Morgan, David O.,Shokat, Kevan M.
, p. 12118 - 12128 (2007/10/03)
The elucidation of protein kinase signaling networks is challenging due to the large size of the protein kinase superfamily (>500 human kinases). Here we describe a new class of orthogonal triphosphate substrate analogues for the direct labeling of analog
