Article
Chemistry, Organic
Motohiro Yasui, Haruna Ohbu, Maho Ishikawa, Tatsuhito Yoshida, Norihiko Takeda, Seiya Hirao, Takumi Abe, Masafumi Ueda
Summary: Spiro[indole-3,3'-pyrrolidine]-2'-ones were synthesized via one-pot chloroformylation-dearomatizing spirocyclization of tryptamine derivatives. Additionally, the thio equivalent spiro[indole-3,3'-pyrrolidine]-2'-thiones, which were previously unreported, were synthesized. The procedures are easily implemented, have a broad scope, and are transition-metal-free and cheap. To demonstrate the utility of the synthetic methodology, the spiro[indole-3,3'-pyrrolidine]-2'-ones were converted into heterocyclic scaffolds, such as an optically active spiroindoline and spirooxindole.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Medicinal
Yue Qiao, Yang Zhang, Zhenrui Qiao, Wenya He, Yingda Chen, Depu Song, Guohao Wang, Ning Guo, Lulian Shao, Zhiyong Tian, Qiang Wang, Lin Yan, Hai Qian
Summary: In this study, novel molecules based on the key pharmacophore structures of classic TRPV1 ligands were designed and synthesized, and a potent TRPV1 antagonist with excellent central nervous system penetration and bioavailability was identified. The findings provide a valuable lead for the development of novel TRPV1 antagonists.
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
(2022)
Article
Chemistry, Organic
Fei Li, Zhuo Li, Youming Wang, Zhenghong Zhou
Summary: A mild and efficient organocatalyzed [3+2] cycloaddition reaction between isatin-derived ketimines and 2-ylideneindane-1,3-diones has been achieved. The resulting spiro[oxindole-3,2'-pyrrolidine] compounds, containing both spiro indane-1,3-dione motif and a trifluoromethyl group, were obtained in high yields with good diastereo- and enantioselectivities.
SYNTHESIS-STUTTGART
(2023)
Article
Chemistry, Organic
S. K. Abu Saleh, Atanu Hazra, Maya Shankar Singh, Saumen Hajra
Summary: The selective C3-allylation and formal [3 + 2]-annulation of spiro-aziridine oxindoles with allylsilanes can be catalyzed by Bronsted acid and/or Lewis acid, resulting in the formation of 3-allyl-3-aminomethyl oxindoles and 5-silyl methyl spiro[pyrrolidine-3,3'-oxindoles], respectively. Acid-catalyzed methods lack stereoselectivity when chiral spiroaziridines are used, but good stereoselectivity can be achieved through the reaction of nonracemic spiroaziridines with allyl-Grignard reagent under catalyst-free conditions. This allylation protocol is useful for the synthesis of biologically active compounds, such as coerulescine and various 5'-substituted spiro[pyrrolidine-3,3'-oxindoles].
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Organic
S. K. Abu Saleh, Atanu Hazra, Maya Shankar Singh, Saumen Hajra
Summary: This study demonstrates the use of Bronsted acid and/or Lewis acid catalysis for the selective C3-allylation and formal [3 + 2]-annulation reactions, leading to the direct synthesis of 3-allyl-3-aminomethyl oxindoles and 5-silyl methyl spiro[pyrrolidine-3,3'-oxindoles]. The reaction of nonracemic spiroaziridines with allyl-Grignard reagent under catalyst-free conditions also provides good stereoselectivity in the formation of 3-allyl-3-aminomethyl oxindoles (ee up to 80%). The allylation protocol is useful for the efficient synthesis of coerulescine and various 5'-substituted spiro[pyrrolidine-3,3'-oxindoles].
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Biochemistry & Molecular Biology
R. Alan Aitken, Andrew D. Harper, Ryan A. Inwood
Summary: The limitations of the reaction between 14 ortho-functionalised 2-aryloxazolines and butyllithium were investigated, revealing challenges in the Wittig rearrangement. While good diastereoselectivity was achieved in some compounds for asymmetric Wittig rearrangement, racemisation issues were encountered upon hydrolysis.
Article
Chemistry, Organic
Chih-Yu Lin, Wan -Wen Huang, Ying-Ti Huang, Sandip Dhole, Indrajeet J. Barve, Chung -Ming Sun
Summary: A rhodium(III)-catalyzed controllable [4 + 1] and [4 + 2] annulation reaction has been developed for the synthesis of spiro[pyrazolo[1,2-a]indazole-pyrrolidines] and fused pyrazolopyrrolo cinnolines. The product selectivity is achieved through time-dependent annulation. The [4 + 1] annulation reaction involves sequential Rh(III)-catalyzed C-H alkenylation of N-aryl pyrazolone, followed by an intramolecular spirocyclization via aza-Michael type addition to afford spiro[pyrazolo[1,2-a]indazole-pyrrolidine]. However, prolonged reaction time converts the in situ formed spiro[pyrazolo[1,2-a]indazole-pyrrolidine] into fused pyrazolopyrrolocinnoline through a strain-driven ring expansion.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Organic
Chih-Yu Lin, Wan-Wen Huang, Ying-Ti Huang, Sandip Dhole, Indrajeet J. Barve, Chung-Ming Sun
Summary: In this study, a rhodium(III)-catalyzed controllable [4 + 1] and [4 + 2] annulation of N-aryl pyrazolones with maleimides was explored for the synthesis of spiro[pyrazolo[1,2-a]indazole-pyrrolidines] and fused pyrazolopyrrolo cinnolines. The selectivity of the products was achieved through time-dependent annulation. The [4 + 1] annulation reaction proceeded via sequential Rh(III)-catalyzed C-H alkenylation of N-aryl pyrazolone, followed by intramolecular spirocyclization via aza-Michael type addition to afford spiro[pyrazolo[1,2-a]indazole-pyrrolidine].
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Organic
Yulia Krivolapova, Olesya A. Tomashenko, Liya D. Funt, Dar'ya Spiridonova, Mikhail S. Novikov, Alexander F. Khlebnikov
Summary: Azirine-triazole hybrids were selectively synthesized under different reaction conditions and the reaction mechanism and selectivity were discussed based on DFT calculations.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2022)
Article
Chemistry, Medicinal
Yanfei Zhang, Jinlai Gao, Jiming Wu, Shihui Liu, Xiaoping Zhang, Xiaoqing Lv
Summary: This article introduces a new class of anticancer agents, (S)-N-1-(thiazol-2-yl) pyrrolidine-1,2-dicarboxamide derivatives, which have dual-target inhibitory activities. Among them, compound 21j is identified as a subtype-selective PI3K alpha / HDAC6 dual inhibitor and shows good anticancer activity in vitro.
BIOORGANIC & MEDICINAL CHEMISTRY LETTERS
(2023)
Article
Biochemistry & Molecular Biology
Sneha R. Sagar, Devendra Pratap Singh, Rajesh D. Das, Nirupa B. Panchal, Vasudevan Sudarsanam, Manish Nivsarkar, Kamala K. Vasu
Summary: A new series of substituted methanone compounds were synthesized and characterized, with compound 10c showing both acute and chronic anti-inflammatory activity as well as promising results in an AlCl3-induced AD model. This compound also demonstrated improved amnesic performance, excellent antioxidant and neuroprotective effects, along with inherent gastrointestinal safety in rats.
BIOORGANIC & MEDICINAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
S. A. Serkov, N. V. Sigay, N. N. Kostikova, A. P. Tyurin, N. G. Kolotyrkina, G. A. Gazieva
Summary: A series of new heterocyclic compounds were synthesized by heating 5-substituted 1,3,4-thiadiazol-2-amines and itaconic acid under solvent-free conditions or with the addition of acetic acid at 140-150°C. The resulting acids can serve as building blocks for the synthesis of new potentially biologically active heterocyclic compounds.
RUSSIAN CHEMICAL BULLETIN
(2023)
Article
Chemistry, Applied
Candice L. Joe, Bahar Inankur, James Chadwick, Sha Lou, Jeffrey Nye, Neil A. Strotman, Albert J. DelMonte
Summary: A scalable synthesis of a key intermediate in the synthesis of an immuno-oncology asset was achieved with high yield and optimized processes. Through process improvement, process mass intensity was reduced and the number of unit operations decreased successfully.
ORGANIC PROCESS RESEARCH & DEVELOPMENT
(2021)
Article
Chemistry, Multidisciplinary
Eduardo Ramirez, Susantha K. K. Ganegamage, Ahmed A. A. Elbatrawy, Heba Alnakhala, Kazuma Shimanaka, Arati Tripathi, Sehong Min, Jean-Christophe Rochet, Ulf Dettmer, Jessica S. S. Fortin
Summary: Protein misfolding leads to various diseases, and a set of 13 compounds were evaluated to reduce protein misfolding. 5-Nitro-1,2-benzothiazol-3-amine and compound 13 showed promising activity in reducing oligomer formation. 5-Nitro-1,2-benzothiazol-3-amine inhibited inclusion formation based on cell analysis.
Article
Chemistry, Organic
Tukaram S. Choudhare, Devendra S. Wagare, Vijay T. Kadam, Prashant D. Netankar
Summary: The study involved the synthesis of 8-(benzyloxy)-5-(2-[1,3-diphenyl-1H-pyrazol-4-yl]thiazol-4-yl)quinolin-2(1H)-one derivatives and their screening for antimicrobial activity. Most of the synthesized compounds showed activity against both gram-positive and gram-negative bacteria, as well as a fungal strain.
JOURNAL OF HETEROCYCLIC CHEMISTRY
(2021)
Article
Biophysics
Jeffrey F. Ellena, Tuo-Xian Tang, Narasimhamurthy Shanaiah, Daniel G. S. Capelluto
Summary: Phafin2 is a peripheral protein that triggers cellular signaling from endosomal and lysosomal compartments. Its specific subcellular localization is mediated by the presence of a tandem of phosphatidylinositol 3-phosphate (PtdIns3P)-binding domains, the pleckstrin homology (PH) and the Fab-1, YOTB, Vac1, and EEA1 (FYVE) domains. The requirement for both domains for binding to PtdIns3P still remains unclear.
BIOMOLECULAR NMR ASSIGNMENTS
(2022)
Article
Chemistry, Inorganic & Nuclear
Jecika M. Velasques, Ronan F. F. de Souza, Debora E. S. Silva, Renan L. Farias, Renan D. Zanetti, Mariete B. Moreira, Javier Ellena, Jose C. M. Pereira, Antonio E. Mauro, Adriano B. Oliveira, Adelino V. G. Netto
Summary: Cyclopalladated compounds were synthesized through halido-alpha-bridge cleavage reactions, showing higher antiproliferative activity against MCF-7 breast cancer cells compared to cisplatin, with IC50 values ranging from 19 to 26 μM. Binding experiments with ct-DNA and HSA were conducted, and molecular docking was performed to study the interaction between one of the compounds and HSA.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2022)
Article
Thermodynamics
J. H. F. de Jesus, R. S. Medeiros, J. A. Ellena, E. T. G. Cavalheiro
Summary: The thermal behavior and polymorphism of tert-butylhydroquinone (TBHQ) were studied using differential scanning calorimetry, infrared spectroscopy, and hot stage microscopy. Two polymorphs of TBHQ were identified depending on the thermal treatment: a commercial form and a new form obtained from melt-crystallization.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Biochemistry & Molecular Biology
Carlos Y. Fernandez, Natalia Alvarez, Analu Rocha, Javier Ellena, Antonio J. Costa-Filho, Alzir A. Batista, Gianella Facchin
Summary: A series of new copper complexes were synthesized and characterized for their potential as antitumor drugs. The experimental results showed that these complexes exhibited good cytotoxicity in solid state and solution, making them potential candidates for the treatment of aggressive tumors with no curative pharmacological treatment.
Article
Chemistry, Inorganic & Nuclear
Henrique Vieira Reis Silva, Guilherme Alvaro Ferreira da Silva, Bruno Zavan, Rafael Pereira Machado, Joao Honorato de Araujo-Neto, Javier Alcides Ellena, Marisa Ionta, Marilia Imaculada Fraza, Antonio Carlos Doriguetto
Summary: A series of new ruthenium complexes were synthesized and characterized. These complexes interacted with DNA and human serum albumin and exhibited cytotoxicity against various cancer cells. One of the complexes showed higher toxicity against melanoma cells, inhibited clonogenic capacity, induced cell cycle arrest, and triggered apoptosis through the production of reactive oxygen species.
Article
Chemistry, Inorganic & Nuclear
Deborah A. Lima, Airton G. Bispo Jr, Diogo A. . Galico, Sergio F. N. Coelho, Joao H. Araujo Neto, Javier A. Ellena, Lanousse Petiote, Italo O. Mazali, Fernando A. . Sigoli
Summary: A new ratiometric luminescent temperature probe has been developed by investigating TbIII and EuIII systems in luminescent coordination polymers. The maximum relative thermal sensitivity of the probe can be tuned by changing the ion-ion separation, chain conformation, and excitation channel.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Joao Honorato de Araujo-Neto, Adriana P. M. Guedes, Celisnolia M. Leite, Carlos Andr e F. Moraes, Andressa L. Santos, Rafaella da S. Brito, Thiago L. Rocha, Francyelli Mello-Andrade, Javier Ellena, Alzir A. Batista
Summary: In this study, three new complexes were synthesized and characterized. Complex C1 exhibited fluorescence, while C2 and C3 had quenched emission. Cytotoxicity experiments showed that C1 and C2 had higher selectivity towards breast tumor cells, with C2 being the most cytotoxic. Mechanistic studies revealed that C2 induced cell cycle arrest and hindered cell migration.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Benedicto A. V. Lima, Jaldyr de J. G. Varela Jr, Javier Ellena, Alzir A. Batista, Alberico B. F. da Silva, Rodrigo S. Correa
Summary: Reactions of cis-[RuCl2(P-P)(bipy)] precursors with the SpymMe2 ligand yielded complexes of the [Ru(SpymMe2)(P-P)(bipy)]PF6 type. The structures of the complexes were characterized and analyzed using various techniques, including spectroscopy, electrochemical analysis, elemental analysis, and single-crystal X-ray diffraction. Theoretical studies were also conducted using the DFT/B3LYP method, which helped to explain the stability and properties of the complexes compared to the precursors. The results showed the importance of coordination and ligand positioning in determining the stability and properties of the complexes.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Biochemistry & Molecular Biology
Joyce C. Oliveira, Renato L. de Carvalho, Hugo G. S. Sampaio, Joao Honorato, Javier A. Ellena, Felipe T. Martins, Joao V. M. Pereira, Pedro M. S. Costa, Claudia Pessoa, Rafaela S. Ferreira, Maria H. Araujo, Claus Jacob, Eufranio N. da Silva Junior
Summary: Our research group successfully combined two redox centres (ortho-quinone/para-quinone or quinone/selenium-containing triazole) through a copper-catalyzed azide-alkyne cycloaddition (CuAAC) reaction, leading to significant anticancer activity. We synthesized 15 new quinone-based derivatives and evaluated their efficacy in nine cancer cell lines and the fibroblast line L929. Our study confirmed the effectiveness of A-ring functionalized para-quinones coupled with ortho-quinones in obtaining diverse two redox centre compounds with potential applications against cancer.
Article
Crystallography
Paulo Nunes, Pedro Henrique de Oliveira Santiago, Cecilia Carolina Pinheiro da Silva, Javier Ellena
Summary: Drug repurposing offers advantages over traditional drug development, particularly with the emergence of the global COVID-19 pandemic. Known drugs like acyclovir have shown efficacy against COVID-19. However, acyclovir's low permeability and limited water solubility pose challenges. This study presents two new salts of acyclovir aimed at improving its pharmacokinetic properties.
Article
Pharmacology & Pharmacy
Natalia Alvarez, Analu Rocha, Victoria Collazo, Javier Ellena, Antonio J. J. Costa-Filho, Alzir A. A. Batista, Gianella Facchin
Summary: Coordination complexes can serve as anticancer agents by enhancing ligand uptake by cancer cells. In this study, the complex Cu-dipicolinate was used as a neutral scaffold to form ternary complexes with diimines, which exhibited strong cytotoxicity towards human cancer cells and high DNA binding affinity.
Article
Pharmacology & Pharmacy
Marcos G. Russo, Elena Brusau, Javier Ellena, Griselda E. Narda
Summary: In this study, two novel solids, crystalline FMT-MT and vitreous FMT-MTa, were successfully obtained using crystal engineering concepts and the co-amorphous formation strategy. The crystalline FMT-MT showed higher physical stability, while the vitreous FMT-MTa exhibited the inherent features of amorphous phases. The solubility assays revealed that both FMT-MT and FMT-MTa were more soluble than the marketed polymorph, with 2.02-fold and 2.68-fold increases in solubility, respectively, in water.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2023)
Article
Chemistry, Multidisciplinary
Marianna C. Silva, Gracielle Cunha, Pollyana Firmino, Loide O. Sallum, Antonio Menezes, Jocely Dutra, Joao de Araujo-Neto, Alzir A. Batista, Javier Ellena, Hamilton B. Napolitano
Summary: The Cerrado biome, as the largest tropical savanna, has a lack of scientific discussion and evidence about the medicinal use of its plants. This study successfully extracted, purified, and characterized 3-O-methylquercetin from Strychnos pseudoquina, and tested its anti-proliferative activity and selectivity against different tumor cell lines. The structural differences of 3-O-methylquercetin were found to influence its activity and selectivity.
Article
Chemistry, Inorganic & Nuclear
Marilia I. F. Barbosa, Rodrigo S. Correa, Adriana P. M. Guedes, Alex M. Graca, Francyelli M. Andrade, Celisnolia M. Leite, Elisangela P. Silveira-Lacerda, Javier Ellena, Henrique V. Reis, Antonio C. Doriguetto, Alzir A. Batista
Summary: Herein, we report on the synthesis and characterization of ruthenium compounds with different amino acids as ligands. The complexes were characterized using various techniques and the structures of two compounds were determined using X-ray diffraction. In vitro evaluation showed that these compounds exhibited cytotoxic activities against triple-negative breast cancer cells and inhibited their migration. Therefore, these compounds may be promising drug candidates for the treatment of triple-negative breast cancer.
Article
Chemistry, Inorganic & Nuclear
Carlos Y. Fernandez, Analu Rocha, Mohammad Azam, Natalia Alvarez, Kim Min, Alzir A. Batista, Antonio J. Costa-Filho, Javier Ellena, Gianella Facchin
Summary: In this study, three copper(II) carboxylate complexes were synthesized and characterized. The complexes showed DNA binding capability and exhibited cytotoxic activity against cisplatin-resistant cancer cells.