- Microwave-assisted synthesis and antimicrobial activity of novel spiro 1,3,4-thiadiazolines from isatin derivatives
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This work describes the synthesis of spiro 1,3,4-thiadiazolines from isatin-β-thiosemicarbazone acetylation, using microwave irradiation as a source of heating the reaction medium. N-substituted isatin derivatives were used as substrates to obtain thiosemicarbazones by adding thiosemicarbazide to the isatin ketone carbonyl. The final synthetic step was the reaction of thiosemicarbazones with acetic anhydride under microwave irradiation to get the spiro compounds. Reaction times ranged from 6 to 18 minutes resulting in yields of up to 90%. Biological assays have shown promising antibacterial and antifungal activity, especially spiro thiadiazolines derived from allylated isatins. All the proposed molecules proved to be potential drug candidates based on the results of the in silico investigation, with satisfactory drug-likeness and drug-score, respecting Lipinski's rule. The use of the microwave reactor was efficient for the synthesis of thiosemicarbazones and spiro compounds, resulting in a significant reduction in reaction times with conventional heating. Taking into account the threat of antimicrobial resistance, this work presents a series of bioactive molecules that are easily obtained via microwave reaction.
- da Costa, Daniel Pereira,de Castro, Aleff Cruz,da Silva, Girlyanderson Araújo,Lima-Junior, Claudio Gabriel,de Andrade Júnior, Francisco Patricio,de Oliveira Lima, Edeltrudes,Vaz, Boniek Gontijo,da Silva, Lidya Cardoso
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p. 766 - 776
(2020/12/31)
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- Synthesis, anti-proliferative activity, theoretical and 1H NMR experimental studies of Morita–Baylis–Hillman adducts from isatin derivatives
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Abstract: Quaternary or spirocyclic 3-substituted-3-hydroxy-2-oxindole is considered a privileged scaffold. In other words, it is a molecular core present on several compounds with a wide spectrum of biological activities. Among its precursors, activated ketones (isatin nucleus) can be used as interesting starting points to Morita–Baylis–Hillman adducts derivatives, a class of compounds with good cytotoxic potential. In this paper, we present the synthesis, anti-proliferative activity against lung cancer cell line and a theoretical conformational study of 21 of Morita–Baylis–Hillman adducts from isatin derivatives, by DFT quantum chemical calculations, followed by a SAR and QSAR analysis. Besides, an efficient synthetic protocol and good biological activity profile were highlighted interesting observations about 1H NMR experimental spectra, molecular modeling results and crystallographic data available. Graphical abstract: [Figure not available: see fulltext.]
- Alencar-Filho, Edilson B.,Araújo, Edigenia C. C.,Brito, Vinicius B. M.,Lima-Júnior, Claudio G.,Martins, Felipe T.,Milit?o, Gardenia C. G.,Oliveira, Boaz G.,Santos, Gilmar F.,Silva, Fábio P. L.,Silva, Thiago D. S.,Souza, Júlia L. C.,Vasconcellos, Mário L. A. A.
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p. 265 - 281
(2019/09/16)
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- Further Studies on Triazinoindoles as Potential Novel Multitarget-Directed Anti-Alzheimer's Agents
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The inadequate clinical efficacy of the present anti-Alzheimer's disease (AD) drugs and their low impact on the progression of Alzheimer's disease in patients have revised the research focus from single targets to multitarget-directed ligands. A novel series of substituted triazinoindole derivatives were obtained by introducing various substituents on the indole ring for the development of multitarget-directed ligands as anti-AD agents. The experimental data indicated that some of these compounds exhibited significant anti-AD properties. Among them, 8-(piperidin-1-yl)-N-(6-(pyrrolidin-1-yl)hexyl)-5H-[1,2,4]triazino[5,6-b]indol-3-amine (60), the most potent cholinesterase inhibitor (AChE, IC50 value of 0.32 μM; BuChE, IC50 value of 0.21 μM), was also found to possess significant self-mediated Aβ1-42 aggregation inhibitory activity (54% at 25 μM concentration). Additionally, compound 60 showed strong antioxidant activity. In the PAMPA assay, compound 60 exhibited blood-brain barrier penetrating ability. An acute toxicity study in rats demonstrated no sign of toxicity at doses up to 2000 mg/kg. Furthermore, compound 60 significantly restored the cognitive deficits in the scopolamine-induced mice model and Aβ1-42-induced rat model. In the in silico ADMET prediction studies, the compound satisfied all the parameters of CNS acting drugs. These results highlighted the potential of compound 60 to be a promising multitarget-directed ligand for the development of potential anti-AD drugs.
- Patel, Dushyant V.,Patel, Nirav R.,Kanhed, Ashish M.,Teli, Divya M.,Patel, Kishan B.,Gandhi, Pallav M.,Patel, Sagar P.,Chaudhary, Bharat N.,Shah, Dharti B.,Prajapati, Navnit K.,Patel, Kirti V.,Yadav, Mange Ram
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p. 3557 - 3574
(2020/11/18)
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- A Facile Synthesis of Novel Isatinspirooxazine Derivatives and Potential in vitro Anti-Proliferative Activity
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Novel isatinspirooxazine derivatives were designed and synthesized as potential anti-proliferative agents. The new compounds were obtained from aldol condensation reactions between isatin and 3-(hydroxyimino)butan-2-one in the presence of an organic base in order to generate an aldol adduct, followed by cyclization in trifluoroacetic acid, providing the desired isatinspirooxazines in 30 to 80percent yield. All the synthesized compounds, including the starting material and the synthetic intermediates, were tested for in vitro anti-proliferative activity against cell lines MCF-7 and MDA-MB231 (breast cancer) and A549 (lung cancer), highlighting the compound 4-methyl,5'-methyl-spiro[(5-aza-4-eno-3-one-cyclohexane)-1,3'-(1H-indol-one)] with an IC50 (half maximal inhibitory concentration) = 0.34 μM, more potent than the reference drug, doxorubicin (IC50 = 1.88 μM), in breast cancer line MDA-MB231.
- Santos, Iara S.,Guerra, Fabiana S.,Bernardino, Lucas F.,Fernandes, Patrícia D.,Hamerski, Lidilhone,Silva, Bárbara V.
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p. 198 - 209
(2018/12/13)
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- Synthesis and initial evaluation of quinoline-based inhibitors of the SH2-containing inositol 5′-phosphatase (SHIP)
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Recently, inhibition of the SH2-containing inositol 5′-phosphatase 1 (SHIP1) has become an attractive strategy for facilitating engraftment of MHC-I mismatched bone marrow grafts, increasing the number of adult stem cells in vivo, and inducing mobilization of hematopoietic stem cells. Utilizing high-throughput screening, two quinoline small molecules (NSC13480 and NSC305787) that inhibit SHIP1 enzymatic activity were discovered. New syntheses of these inhibitors have been developed which verified the relative stereochemistry of these structures. Utilizing this synthetic route, some analogs of these quinolines have been prepared and tested for their ability to inhibit SHIP. These structure activity studies determined that an amine tethered to the quinoline core is required for SHIP inhibition. SHIP inhibition may explain the antitumor effects of similar quinoline amino alcohols and provides an impetus for further synthetic studies in this class of compounds.
- Russo, Christopher M.,Adhikari, Arijit A.,Wallach, Daniel R.,Fernandes, Sandra,Balch, Amanda N.,Kerr, William G.,Chisholm, John D.
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supporting information
p. 5344 - 5348
(2015/11/09)
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- Chlorination of isatins with trichloroisocyanuric acid
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Isatin and its derivatives have been extensively reported in the literature as having range of potential pharmacological compounds. The Sandmeyer method is the most widely used for isatin synthesis and furnishes different substituted isatins, usually with high yields. Although efficient, the Sandmeyer route has certain limitations, such as the formation of a mixture of regiosiomers and low yields depending on the type and position of the substituent. Thus, overcome these limitations, it is preferable that some derivative isatins be obtained by alternative methods. This article has investigated the chlorination of isatin derivatives using trichloroisocyanuric acid [1,3,5-trichloro- 1,3,5-triazine-2,4,6-(1H,3H,5H)-trione or TCCA] at different reaction conditions.
- Silva, Ba?rbara V.,Esteves, Pierre M.,Pinto, Angelo C.
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scheme or table
p. 257 - 263
(2011/10/01)
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