- Design and synthesis of chiral spirobifluorenes
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Chiroptical spectroscopic methods serve as a practical tool for the structural characterization of chiral systems based on the interaction with polarized light. The higher sensitivity of these methods, compared with their achiral counterparts, not only enables the determination of absolute configuration and conformational preferences, but also supramolecular interactions may be monitored. In order to expand the applicability of chiroptical systems, the development of functional materials exhibiting intense chiroptical responses is essential. As a proof of principle, we previously constructed chiroptical interfaces via thioacetate-derivatized allenes. Because of the photoisomerization issues associated with allenes, we have recently proposed their replacement by spirobifluorenes to achieve robust chiroptical systems. Thus, we hereby present the design and synthesis of chiral spirobifluorenes bearing thioacetates suitable for suface functionalization.
- Alonso-Gómez, J. Lorenzo,Ozcelik, Ani,Pe?a-Gallego, María de los ángeles,Pereira-Cameselle, Raquel
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- Synthesis of novel 1,2,3-triazole derivatives of isocoumarins and 3,4-dihydroisocoumarin with potential antiplasmodial activity in vitro
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Background: Malaria greatly affects the world health, having caused more than 228 million cases only in 2018. The emergence of drug resistance is one of the main problems in its treatment, dem-onstrating the need for the development of new antimalarial drugs. Objective: Synthesis and in vitro antiplasmodial evaluation of triazole compounds derived from isocou-marins and a 3,4-dihydroisocoumarin. Methods: The compounds were synthesized in 4 to 6-step reactions with the formation of the triazole ring via the Copper(I)-catalyzed 1,3-dipolar cycloaddition between isocoumarin or 3,4-dihydroisocoumarin azides and terminal alkynes. This key reaction provided compounds with an un-precedented connection of isocoumarin or 3,4-dihydroisocoumarin and the 1,2,3-triazole ring. The products were tested for their antiplasmodial activity against a Plasmodium falciparum chloroquine resistant and sensitive strains (W2 and 3D7, respectively). Results: Thirty-one substances were efficiently obtained by the proposed routes with an overall yield of 25-53%. The active substances in the antiplasmodial test displayed IC50 values ranging from 0.68-2.89 μM and 0.85-2.07 μM against W2 and 3D7 strains, respectively. Conclusion: This study demonstrated the great potential of isocoumarin or 3,4-dihydroisocoumarin derivatives because practically all the tested substances were active against Plasmodium falciparum.
- Alves, Rosemeire Brondi,Pinto, Ana Claudia de Souza,Santos, Lucas da Silva,Varotti, Fernando de Pilla,da Fonseca, Amanda Luisa,de Carvalho, Matheus Fillipe Langanke,de Freitas, Rossimiriam Pereira,Lopes, Julio César Dias
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p. 820 - 833
(2021/10/21)
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- Nucleophilic Substitution of Aliphatic Fluorides via Pseudohalide Intermediates
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A method for aliphatic fluoride functionalization with a variety of nucleophiles has been reported. Carbon–fluoride bond cleavage is thermodynamically driven by the use of silylated pseudohalides TMS-OMs or TMS-NTf2, resulting in the formation of TMS-F and a trapped aliphatic pseudohalide intermediate. The rate of fluoride/pseudohalide exchange and the stability of this intermediate are such that little rearrangement is observed for terminal fluoride positions in linear aliphatic fluorides. The ability to convert organofluoride positions into pseudohalide groups allows facile nucleophilic attack by a wide range of nucleophiles. The late introduction of the nucleophiles also allows for a wide range of functional-group tolerance in the coupling partners. Selective alkyl fluoride mesylation is observed in the presence of other alkyl halides, allowing for orthogonal synthetic strategies.
- Jaiswal, Amit K.,Prasad, Pragati K.,Young, Rowan D.
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p. 6290 - 6294
(2019/04/26)
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- Synthesis of cinnamic acid derivatives and leishmanicidal activity against Leishmania braziliensis
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Leishmania braziliensis is one of the pathogenic agents of cutaneous and mucocutanoeous leishmaniasis. There are no validated vaccines to prevent the infection and the treatment relies on drugs that often present severe side effects, which justify the efforts to find new potential antileishmanial drugs. An alternative to promote the discovery of new drugs would be the association of different chemical groups of bioactive compounds. Here we describe the synthesis and bioactivity evaluation against L. braziliensis of cinnamic acid derivatives possessing isobenzofuranone and 1,2,3-triazole functionalities. We tested 25 compounds at 10 μM concentration against extracellular promastigotes and intracellular amastigotes during macrophage infection. Most compounds were more active against amastigotes than to promastigotes. The derivatives (E)-3-oxo-1,3-dihydroisobenzofuran-5-yl-(3,4,5-trimethoxy) cinnamate (5c), (1-(3,4-difluorobenzyl)-1H-1,2,3-triazol-4-yl)methyl cinnamate (9g), and (1-(2-bromobenzyl)-1H-1,2,3-triazol-4-yl)methyl cinnamate (9l) were the most effective presenting over 80% toxicity on L. braziliensis amastigotes. While compound 5c is a cinnamate with an isobenzofuranone portion, 9g and 9l are triazolic cinnamic acid derivatives. The action of these compounds was comparable to amphotericin B used as positive control. Ultrastructural analysis revealed that 5c-treated parasites showed impaired cytokinesis and apoptosis triggering. Taken together, these results highlight the potential of cinnamic acid derivatives in development of novel anti-leishmanial drugs.
- Rodrigues, Michelle Peixoto,Tomaz, Deborah Campos,?ngelo de Souza, Luciana,Onofre, Thiago Souza,Aquiles de Menezes, Wemerson,Almeida-Silva, Juliana,Suarez-Fontes, Ana Márcia,Rogéria de Almeida, Márcia,Manoel da Silva, Adalberto,Bressan, Gustavo Costa,Vannier-Santos, Marcos André,Rangel Fietto, Juliana Lopes,Teixeira, Róbson Ricardo
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- Synthesis of nerol derivatives containing a 1,2,3-triazole moiety and evaluation of their activities against cancer cell lines
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In the present investigation, a collection of twenty two nerol derivatives, containing 1,2,3-triazolic appendages, was synthesized and screened in vitro for their cytotoxic activity against HL60, Nalm6, and Jurkat human leukemia cells as well as against B16F10 (melanoma cell line). In most cases, derivatives were able to reduce cell viability. The most potent compound (Z)-4-(((3,7-dimethylocta-2,6-dien-1-yl)oxy)methyl)-1-(4-(trifluoromethoxy)benzyl)-1H-1,2,3 triazole showed antiproliferative activity against Jurkat cells and reduced B16F10 cell migration. Physicochemical properties of the compounds were calculated in order to evaluate their potential for drug development. Most of the evaluated physicochemical parameters seemed to be favorable for drug development. In addition, for a better understanding of the biological activity results, 3D quantitative structure-activity relationship (QSAR) studies were carried out. 3D-QSAR studies indicate that the anticancer activities observed for the cell lines HL60 and Jurkat may occur by a similar mechanism of action and the same was found for the Nalm6 and B16F10 cell lines.
- Teixeira, Róbson R.,Da Silva, Adalberto M.,Siqueira, Raoni P.,Gon?alves, Victor Hugo S.,Pereira, Higor S.,Ferreira, Rafaela S.,Costa, Adilson V.,de Melo, Eduardo B.,Paula, Fávero R.,Ferreira, Márcia M.C.,Bressan, Gustavo C.
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p. 541 - 561
(2019/08/26)
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- Novel leucine ureido derivatives as aminopeptidase N inhibitors using click chemistry
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The over-expression of aminopeptidase N on diverse malignant cells is associated with the tumor angiogenesis and metastasis. In this report, one new series of leucine ureido derivatives containing the triazole moiety was designed, synthesized and evaluated as APN inhibitors. Among them, compound 13v showed the best APN inhibition with an IC50 value of 0.089 ± 0.007 μM, which was two orders of magnitude lower than that of bestatin (IC50 = 9.4 ± 0.5 μM). Compound 13v also showed dose-dependent anti-angiogenesis activities. Even at the lower concentration (10 μM), compound 13v presented similar anti-angiogenesis activity compared with bestatin at 100 μM in both the human umbilical vein endothelial cells (HUVECs) capillary tube formation assay and the rat thoracic aorta rings test. Moreover, compared with bestatin, 13v exhibited comparable, if not better in vivo anti-metastasis activity in a mouse H22 pulmonary metastasis model.
- Cao, Jiangying,Ma, Chunhua,Zang, Jie,Gao, Shuai,Gao, Qianwen,Kong, Xiujie,Yan, Yugang,Liang, Xuewu,Ding, Qin'ge,Zhao, Chunlong,Wang, Binghe,Xu, Wenfang,Zhang, Yingjie
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p. 3145 - 3157
(2018/06/01)
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- Synthesis and leishmanicidal activity of eugenol derivatives bearing 1,2,3-triazole functionalities
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In this paper, it is described the synthesis and the evaluation of the leishmanicidal activity of twenty-six eugenol derivatives bearing 1,2,3-triazole functionalities. The evaluation of the compounds on promastigotes of Leishmania amazonensis (WHOM/BR/75/Josefa) showed that eugenol derivatives present leishmanicidal activities with varying degrees of effectiveness. The most active compound, namely 4-(3-(4-allyl-2-methoxyphenoxy)propyl)-1-(4-methylbenzyl)-1H-1,2,3-triazole (7k) (IC50 = 7.4 ± 0.8 μmol L?1), also targeted Leishmania parasites inside peritoneal macrophages (IC50 = 1.6 μmol L?1) without interfering with cell viability. The cytotoxicity of 7k against macrophage cells presented IC50 of 211.9 μmol L?1 and the selective index was equal to 132.5. Under similar conditions, compound 7k was more effective than glucantime and pentamidine, two drugs currently in the clinic. In addition, theoretical calculations showed that this compound also presents most physicochemical and pharmacokinetic properties within the ranges expected for orally available drugs. It is believed that eugenol bearing 1,2,3-triazole functionalities may represent a scaffold to be explored toward the development of new agents to treat leishmaniasis.
- Teixeira, Róbson Ricardo,Gazolla, Poliana Aparecida Rodrigues,da Silva, Adalberto Manoel,Borsodi, Maria Paula Gon?alves,Bergmann, Bartira Rossi,Ferreira, Rafaela Salgado,Vaz, Boniek Gontijo,Vasconcelos, Géssica Adriana,Lima, Wallace Pacienza
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p. 274 - 286
(2018/02/10)
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- Synthesis of potential anti-Trypanosoma cruzi azole-naftifine analogues by azide–alkyne click reaction
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Twenty novel azole-naftifine analogues were obtained using azide–alkyne click reaction. Five of them were more potent than the positive control naftifine revealing an unprecedented antiproliferative effects against Trypanosoma cruzi.
- Callegario Zacchi, Carlos Henrique,Maior Federighi, Stephanie Souto,Ramos Gadelha, Fernanda,Terra Martins, Felipe,Brondi Alves, Rosemeire,de Fátima, ?ngelo
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p. 195 - 197
(2018/04/05)
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- Coupling of arylboronic acids with benzyl halides or mesylates without adding transition metal catalysts
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We report herein a transition-metal-free coupling reaction of arylboronic acids with benzyl halides and mesylates for the construction of C(sp2)[sbnd]C(sp3) bonds. A unique feature of this coupling reaction is the formation regioisomers in some cases. Mechanistic studies suggest that this reaction may proceed via an unprecedented Friedel–Crafts-type reaction pathway under base conditions with the assistance of boronic acid moiety.
- Wu, Guojiao,Xu, Shuai,Deng, Yifan,Wu, Chaoqiang,Zhao, Xia,Ji, Wenzhi,Zhang, Yan,Wang, Jianbo
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p. 8022 - 8030
(2016/11/19)
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- Metal-Free Trifluoromethylthiolation of Alkyl Electrophiles via a Cascade of Thiocyanation and Nucleophilic Cyanide-CF3 Substitution
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A straightforward synthesis of alkyl trifluoromethyl thioethers was developed that starts from widely available alkyl halides or mesylates and the inexpensive reagents sodium thiocyanate and trimethyl(trifluoromethyl)silane. The alkyl electrophiles are converted in situ into the corresponding thiocyanates, which react with the nucleophilic Ruppert-Prakash reagent to give the corresponding trifluoromethyl thioethers via a Langlois-type CN-CF3 substitution. This process enables the efficient introduction of the pharmaceutically meaningful trifluoromethylthio groups into functionalized molecules without the need of metal catalysts or expensive preformed trifluoromethylthiolating agents.
- Matheis, Christian,Wang, Minyan,Krause, Thilo,Goossen, Lukas J.
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supporting information
p. 1628 - 1632
(2015/06/30)
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- BENZENE SULFONAMIDE DERIVATIVES AND THEIR USE AS RORC MODULATORS
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Compounds of the formula la or lb: or pharmaceutically acceptable salts thereof, wherein m, n, p, q, r, A, D, E, G, X1, X2, X3, X4, Y, Z, R1, R2, R3, R4, R5, R6, R7, and R8 are as defined herein. Also disclosed are methods of making the compounds and using the compounds for treatment of inflammatory diseases such as arthritis.
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Page/Page column 52
(2015/12/08)
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- BENZYL SULFONAMIDE DERIVATIVES AS RORC MODULATORS
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Compounds of the formula Ia or Ib: or pharmaceutically acceptable salts thereof, wherein m, n, p, q, r, A, X1, X2, X3, X4, Y, Z, R1, R2, R3, R4, R5, R6, R7, and R8 are as defined herein. Also disclosed are methods of making the compounds and using the compounds for treatment of inflammatory diseases such as arthritis.
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Paragraph 0431
(2014/06/24)
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- BENZYL SULFONAMIDE DERIVATIVES AS RORc MODULATORS
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Compounds of the formula Ia or Ib: or pharmaceutically acceptable salts thereof, wherein m, n, r, A, X1, X2, X3, X4, Y, Z, R1, R2, R3, R4, R5, R6
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Page/Page column 12
(2014/06/24)
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- Synthesis and antiproliferative activity of 8-hydroxyquinoline derivatives containing a 1,2,3-triazole moiety
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Twelve novel 8-hydroxyquinoline derivatives were synthesized with good yields by performing coppercatalyzed Huisgen 1,3-dipolar cycloaddition ("click" reaction) between an 8-O-alkylated-quinoline containing a terminal alkyne and various aromatic or protected sugar azides. These compounds were evaluated in vitro for their antiproliferative activity on various cancer cell types. Protected sugar derivative 16 was the most active compound in the series, exhibiting potent antiproliferative activity and high selectivity toward ovarian cancer cells (OVCAR-03, GI50 -1); this derivative was more active than the reference drug doxorubicin (OVCAR-03, GI50 = 0.43 μg mL-1). In structureeactivity relationship (SAR) studies, the physico-chemical parameters of the compounds were evaluated and docking calculations were performed for the a-glucosidase active site to predict the possible mechanism of action of this series of compounds.
- De O. Freitas, Luiza B.,Borgati, Thiago F.,De Freitas, Rossimiriam P.,Ruiz, Ana L. T. G.,Marchetti, Gabriela M.,De Carvalho, Joo E.,Da Cunha, Elaine F. F.,Ramalho, Teodorico C.,Alves, Rosemeire B.
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p. 595 - 604
(2015/03/14)
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- Synthesis and phytotoxic activity of 1,2,3-triazole derivatives
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Thirteen triazole derivatives bearing halogenated benzyl substituents were synthesized using the Cu-catalyzed azide-alkyne cycloaddition (CuAAC),a leading example of the click chemistry approach,as the key step. The biological activity of the compounds was evaluated,and it was found that these compounds interfere with the germination and radicle growth (shoots and roots) of two dicotyledonous species,Lactuca sativa and Cucumis sativus,and one monocotyledonous species,Allium cepa. The compounds showed predominantly inhibitory activity related to the evaluated species mainly at the concentration of 10-4 mol L-1. Some of them presented inhibitory activity comparable to 2,4-D (2,4-dichlorophenoxyacetic acid),used as positive control.
- Borgati, Thiago F.,Alves, Rosemeire B.,Teixeira, Ro?bson R.,De Freitas, Rossimiriam P.,Perdiga?o, Thays G.,Da Silva, Silma F.,Dos Santos, Aline Aparecida,De Jesu?s O. Bastidas, Alberto
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p. 953 - 961
(2013/08/23)
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- LINCOMYCIN DERIVATIVES AND ANTIBACTERIAL AGENTS CONTAINING THE SAME AS THE ACTIVE INGREDIENT
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An objective of the present invention is to provide compounds of formula (1) or their pharmacologically acceptable salts or solvates wherein A represents aryl; R1 represents N-optionally substituted C1-6 alkyl-N-optionally substituted C1-6 alkylamino-C1-6 alkyl; R2 represents a hydrogen atom or optionally substituted C1-6 alkyl; R3 represents optionally substituted C1-6alkyl or C3-6 cycloalkyl-C1-4 alkyl; m is 1 to 3; n is 0; and p is 0 to 2. The compounds are novel lincomycin derivatives that have a potent activity against resistant Streptococcus pneumoniae, which have recently posed problems, in the treatment of infectious diseases. Further, the compounds are usable as antimicrobial agents and are useful for preventing or treating bacterial infectious diseases.
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Page/Page column 39
(2010/03/02)
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- A metal-free catalytic system for the oxidation of benzylic methylenes and primary amines under solvent-free conditions
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Iodine-pyridine-tert-butylhydroperoxide is developed as a green and efficient catalytic system for the oxidation of benzylic methylenes to ketones and primary amines to nitriles. The reaction conditions are quite mild and environmentally benign, no transition metals, organic solvents or hazard reagents being needed. The oxidation of benzylic methylenes gave the corresponding ketones in excellent yields with complete chemoselectivity, while the oxidation of primary amines was complete in several minutes, affording various nitriles in moderate to good yields.
- Zhang, Jintang,Wang, Zhentao,Wang, Ye,Wan, Changfeng,Zheng, Xiaoqi,Wang, Zhiyong
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supporting information; scheme or table
p. 1973 - 1978
(2010/06/15)
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- Synthesis of radioiodine labeled dibenzyl disulfide for evaluation of tumor cell uptake
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Benzyl 4-halobenzyl and ally benzyl disulfide were synthesized as diallyl disulfide analogues and their tumor growth inhibitory effects on the cancer cells (SNU C5 and MCF-7) were comparable to that of diallyl disulfide, indicating that the disulfide func
- Ryu, Eun Kyoung,Choe, Yearn Seong,Byun, Sang Sung,Lee, Kyung-Han,Chi, Dae Yoon,Choi, Yong,Kim, Byung-Tae
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p. 859 - 864
(2007/10/03)
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