Organic Reactivity and Medicinal Chemistry | - CCMAR -

Organic Reactivity and Medicinal Chemistry

Short Title 

Development of heterocyclic compounds applicable in medicine, environmental remediation or aquaculture. Investigation of structure, reactivity and activity of compounds obtained from synthesis or natural sources.



The group applies the methods and tools of Physical Organic Chemistry and Medicinal Chemistry to investigate structure/reactivity/activity relationships of selected compounds from biologically relevant chemotypes: endoperoxydes, quinolones, tetrazoles and saccharins. We aim to contribute to the elucidation of interactions between compounds and their biological targets, thereby gathering instrumental information for rational drug design and optimization.

Topic 1. Development of anti-infective agents comprising quinolone- or peroxide-based heterocycles.

We investigate structural requirements of 4-oxoquinoline-3-esters for inhibition of the bc1 complex (respiratory chain) of Plasmodium falciparum (CQ-sensitive and multiresistant strains). Selected 2-substituted-4-oxoquinolines prepared exhibit potent activity against Mycobacterium tuberculosis.

Inspired in the antimalarial drug Artemisinin, a natural product, we develop synthetic endoperoxides with improved pharmacologic profile. We consider exploring peroxides inspired in Plakortin, a peroxide-based metabolite obtained from the marine sponge Plakortis halichondrioides.

We scrutinize the potencial of endoperoxides against other protozoans: Leishmania donovani, Perkinsus olseni, and Amyloodinium ocellatum the causative agents of Leishmaniases (in mamals), Perkinsosis (in bivalves) and Amyloodinium ocellatum (in fish), respectively.

Topic 2. Synthesis, reactivity and applications of chelants derived from tetrazole and saccharin.

We develop tetrazole-saccharyl conjugates as selective chelants and scrutinise their potential in catalysis, environmental remediation, medicine and in the design of supramolecular frameworks.

We demonstrated their utility as ligands for divalent cations. Selected copper complexes act as effective catalysts for oxidation of secondary alcohols and have shown potent cytotoxicity against adherent cancer cell lines.



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Retrato de Alina Secrieru
PhD Student
Retrato de Amin Lopes Ismael
Retrato de André Lourenço Fernandes
Retrato de Bruno Emanuel de Campos Guerreiro
PhD Student
Retrato de Joana F. Leal
Retrato de Lília Cabral
Research Assistant
Retrato de Patrícia Amado
PhD Student
Todas publicações
Cabral LIL, Brás E, Henriques M, et al. Synthesis, Structure and Cytotoxicity of a Novel Sulphanyl-Bridged Thiadiazolyl-Saccharinate Conjugate. The Relevance of S…N Interaction. Chemistry - A European Journal. 2017. doi:10.1002/chem.201705319
Frija LMT, Kuznetsov ML, Rocha BGM, et al. Organocatalyzed oxidation of benzyl alcohols by a tetrazole-amino-saccharin: A combined experimental and theoretical (DFT) study. Molecular Catalysis. 2017;442:57 - 65. doi:10.1016/j.mcat.2017.09.003
Mestre ALG, Inácio PMC, Elamine Y, et al. Extracellular Electrophysiological Measurements of Cooperative Signals in Astrocytes Populations. Frontiers in Neural Circuits. 2017;11. doi:10.3389/fncir.2017.00080
Mestre ALG, Cerquido M, Inácio PMC, et al. Ultrasensitive gold micro-structured electrodes enabling the detection of extra-cellular long-lasting potentials in astrocytes populations. Scientific Reports. 2017;7(1). doi:10.1038/s41598-017-14697-y
Cabral LIL, Henriques MSC, Paixão JA, Cristiano MLS. Synthesis and structure of 2-substituted pyrene-derived scaffolds. Tetrahedron Letters. 2017;58(48):4547 - 4550. doi:10.1016/j.tetlet.2017.10.058
W. Hong D, Gibbons PD, Leung SC, et al. Rational Design, Synthesis, and Biological Evaluation of Heterocyclic Quinolones Targeting the Respiratory Chain of Mycobacterium tuberculosis. Journal of Medicinal Chemistry. 2017;60(9):3703 - 3726. doi:10.1021/acs.jmedchem.6b01718
Horta P, Henriques MSC, Brás EM, et al. On the ordeal of quinolone preparation via cyclisation of aryl-enamines; synthesis and structure of ethyl 6-methyl-7-iodo-4-(3-iodo-4-methylphenoxy)-quinoline-3-carboxylateAbstract. Pure and Applied Chemistry. 2017;89(6). doi:10.1515/pac-2016-1119
Lobo L, de Sousa B, Cabral LIL, Cristiano MLS, Nogueira F. Highly active ozonides selected against drug resistant malaria. Memórias do Instituto Oswaldo Cruz. 2016;111(7):450 - 453. doi:10.1590/0074-02760160077
Frija LMT, Alegria ECBA, Sutradhar M, et al. Copper(II) and cobalt(II) tetrazole-saccharinate complexes as effective catalysts for oxidation of secondary alcohols. Journal of Molecular Catalysis A: Chemical. 2016;425:283 - 290. doi:10.1016/j.molcata.2016.10.023
Ismael A, Fausto R, Cristiano MLS. Photochemistry of 1- and 2-Methyl-5-aminotetrazoles: Structural Effects on Reaction Pathways. The Journal of Organic Chemistry. 2016;81(23):11656 - 11663. doi:10.1021/acs.joc.6b02023
Ismael A, Henriques MSC, Marques C, et al. Exploring saccharinate-tetrazoles as selective Cu(. RSC Adv. 2016;6(75):71628 - 71637. doi:10.1039/C6RA15051A
Borba A, Cabral LIL, Fausto R, Cristiano MLS. Structure, vibrational spectroscopy, and photochemistry of 5-phenoxy-1-phenyltetrazole in argon and nitrogen cryomatrices. Canadian Journal of Chemistry. 2015;93(12):1335 - 1344. doi:10.1139/cjc-2015-0025
Horta PC, Henriques MSC, Kuş N, et al. Synthesis, structural and conformational analysis, and IR spectra of ethyl 4-chloro-7-iodoquinoline-3-carboxylate. Tetrahedron. 2015;71(40):7583 - 7592. doi:10.1016/j.tet.2015.07.076
Horta P, Kuş N, Henriques MSofia C, et al. Quinolone-Hydroxyquinoline Tautomerism in Quinolone 3-Esters. Preserving the 4-Oxoquinoline Structure To Retain Antimalarial Activity. J Org Chem. 2015;80(24):12244-57. doi:10.1021/acs.joc.5b02169
Cortes S, Albuquerque A, Cabral LIL, Lopes L, Campino L, Cristiano MLS. In Vitro Susceptibility of Leishmania infantum to Artemisinin Derivatives and Selected Trioxolanes. Antimicrob Agents Chemother. 2015;59(8):5032-5. doi:10.1128/AAC.00298-15
Ismael A, Borba A, Henriques MSC, Paixão JA, Fausto R, Cristiano MLS. Structure and photochemistry of a saccharyl thiotetrazole. J Org Chem. 2015;80(1):392-400. doi:10.1021/jo502419u
Ismael A, Gago DJP, Cabral LIL, Fausto R, Cristiano MLS. Investigations into the Mechanism of Solvolysis of 3-aryloxybenzisothiazoles. Croatica Chemica Acta. 2014;87(4):363 - 373. doi:10.5562/cca2478
Frija LMT, Cristiano MLS, Gómez-Zavaglia A, Reva I, Fausto R. Genesis of rare molecules using light-induced reactions of matrix-isolated tetrazoles. Journal of Photochemistry and Photobiology C: Photochemistry Reviews. 2014;18:71 - 90. doi:10.1016/j.jphotochemrev.2013.09.001
Araujo NCP, Afonso R, Bringela A, M. Cancela L, Cristiano MLS, Leite RB. Peroxides with antiplasmodial activity inhibit proliferation of Perkinsus olseni, the causative agent of Perkinsosis in bivalves. Parasitol Int. 2013;62(6):575-82. doi:10.1016/j.parint.2013.06.010
Ismael A, Serpa C, Cristiano MLS. Photochemistry of 1-allyl-4-aryltetrazolones in solution; structural effects on photoproduct selectivity. Photochem Photobiol Sci. 2013;12(2):272-83. doi:10.1039/c2pp25210d
Duarte L, Reva I, Cristiano MLS, Fausto R. Photoisomerization of saccharin. J Org Chem. 2013;78(7):3271-5. doi:10.1021/jo400191p
La Pensée L, Sabbani S, Sharma R, et al. Artemisinin-polypyrrole conjugates: synthesis, DNA binding studies and preliminary antiproliferative evaluation. ChemMedChem. 2013;8(5):709-18. doi:10.1002/cmdc.201200536
Ismael A, Gómez-Zavaglia A, Borba A, Cristiano MLS, Fausto R. Amino→imino tautomerization upon in vacuo sublimation of 2-methyltetrazole-saccharinate as probed by matrix isolation infrared spectroscopy. J Phys Chem A. 2013;117(15):3190-7. doi:10.1021/jp401360c
Cabral LIL, Maria TMR, Martelo L, Eusébio MES, Cristiano MLS, Fausto R. The thermal sigmatropic isomerization of pseudosaccharyl crotyl ether. Tetrahedron. 2013;69(2):810 - 815. doi:10.1016/j.tet.2012.10.100
Ismael A, Paixão JAntónio, Fausto R, Cristiano MLS. Molecular structure of nitrogen-linked methyltetrazole-saccharinates. Journal of Molecular Structure. 2012;1023:128 - 142. doi:10.1016/j.molstruc.2012.04.018
Ismael A, Borba A, Duarte L, Giuliano BM, Gómez-Zavaglia A, Cristiano MLS. Structure and photochemistry of a novel tetrazole-saccharyl conjugate isolated in solid argon. Journal of Molecular Structure. 2012;1025:105 - 116. doi:10.1016/j.molstruc.2012.04.081
Gómez-Zavaglia A, Ismael A, Cabral LIL, et al. Structural investigation of nitrogen-linked saccharinate–tetrazole. Journal of Molecular Structure. 2011;1003(1-3):103 - 110. doi:10.1016/j.molstruc.2011.07.044
Frija LMT, Reva I, Ismael A, Coelho DV, Fausto R, Cristiano MLS. Sigmatropic rearrangements in 5-allyloxytetrazoles. Org Biomol Chem. 2011;9(17):6040-54. doi:10.1039/c1ob05460k
Frija LMiguel Teo, Ismael A, Cristiano MLS. Photochemical transformations of tetrazole derivatives: applications in organic synthesis. Molecules. 2010;15(5):3757-74. doi:10.3390/molecules15053757
Gibbons P, Verissimo E, Araujo NC, et al. Endoperoxide carbonyl falcipain 2/3 inhibitor hybrids: toward combination chemotherapy of malaria through a single chemical entity. J Med Chem. 2010;53(22):8202-6. doi:10.1021/jm1009567
Ismael A, Cristiano MLS, Fausto R, Gómez-Zavaglia A. Tautomer selective photochemistry in 1-(tetrazol-5-yl)ethanol. J Phys Chem A. 2010;114(50):13076-85. doi:10.1021/jp109215q
Gómez-Zavaglia A, Kaczor A, Coelho D, Cristiano MLS, Fausto R. Conformational and structural analysis of 2-allyl-1,2-benzisothiazol-3(2H)-one 1,1-dioxide as probed by matrix-isolation spectroscopy and quantum chemical calculations. Journal of Molecular Structure. 2009;919(1-3):271 - 276. doi:10.1016/j.molstruc.2008.09.013
Araújo NCP, Barton V, Jones M, et al. Semi-synthetic and synthetic 1,2,4-trioxaquines and 1,2,4-trioxolaquines: synthesis, preliminary SAR and comparison with acridine endoperoxide conjugates. Bioorg Med Chem Lett. 2009;19(7):2038-43. doi:10.1016/j.bmcl.2009.02.013
Frija LMT, Fausto R, Loureiro RMS, Cristiano MLS. Synthesis and structure of novel benzisothiazole-tetrazolyl derivatives for potential application as nitrogen ligands. Journal of Molecular Catalysis A: Chemical. 2009;305(1-2):142 - 146. doi:10.1016/j.molcata.2008.12.007
Gómez-Zavaglia A, Kaczor A, Almeida R, et al. Thermally induced sigmatropic isomerization of pseudosaccharyl allylic ether. J Phys Chem A. 2009;113(15):3517-22. doi:10.1021/jp8112254
Almeida R, Gómez-Zavaglia A, Kaczor A, Ismael A, Cristiano MLS, Fausto R. Matrix-isolation FTIR, theoretical structural analysis and reactivity of amino-saccharins: N-(1,1-dioxo-1,2-benzisothiazol-3-yl)-N-methyl amine and -N,N-dimethyl amine. Journal of Molecular Structure. 2009;938(1-3):198 - 206. doi:10.1016/j.molstruc.2009.09.027
Verissimo E, Berry N, Gibbons P, et al. Design and synthesis of novel 2-pyridone peptidomimetic falcipain 2/3 inhibitors. Bioorg Med Chem Lett. 2008;18(14):4210-4. doi:10.1016/j.bmcl.2008.05.068
Kaczor A, Almeida R, Gómez-Zavaglia A, Cristiano MLS, Fausto R. Molecular structure and infrared spectra of the monomeric 3-(methoxy)-1,2-benzisothiazole 1,1-dioxide (methyl pseudosaccharyl ether). Journal of Molecular Structure. 2008;876(1-3):77 - 85. doi:10.1016/j.molstruc.2007.06.004
Gómez-Zavaglia A, Kaczor A, Almeida R, Cristiano MLS, Fausto R. Conformational Space of the P seudo saccharin Allyl Ether 3-(Allyloxy)-1,2-benzisothiazole 1,1-Dioxide in Gas Phase and in Rare Gas Matrices. The Journal of Physical Chemistry A. 2008;112(8):1762 - 1772. doi:10.1021/jp0770918
Frija LMT, Khmelinskii IV, Serpa C, Reva ID, Fausto R, Cristiano MLS. Photochemistry of 5-allyloxy-tetrazoles: steady-state and laser flash photolysis study. Organic & Biomolecular Chemistry. 2008;6(6):1046. doi:10.1039/b718104c
Cristiano MLS, Ruasse M-F. Editorial. Journal of Physical Organic Chemistry. 2008;21(7-8):523 - 523. doi:10.1002/poc.1411
Gómez-Zavaglia A, Kaczor A, Almeida R, Cristiano MLS, Fausto R. Conformational space of the Pseudosaccharin allyl ether 3-(allyloxy)-1,2-benzisothiazole 1,1-dioxide in gas phase and in rare gas matrices. J Phys Chem A. 2008;112(8):1762-72. doi:10.1021/jp0770918
Verissimo E, Berry N, Gibbons P, et al. Design and synthesis of novel 2-pyridone peptidomimetic falcipain 2/3 inhibitors. Bioorganic & Medicinal Chemistry Letters. 2008;18(14):4210 - 4214. doi:10.1016/j.bmcl.2008.05.068
Frija LMT, Khmelinskii IV, Serpa C, Reva ID, Fausto R, Cristiano MLS. Photochemistry of 5-allyloxy-tetrazoles: steady-state and laser flash photolysis study. Org Biomol Chem. 2008;6(6):1046-55. doi:10.1039/b718104c
Kaczor A, Proniewicz LM, Almeida R, et al. The Chapman-type rearrangement in pseudosaccharins: The case of 3-(methoxy)-1,2-benzisothiazole 1,1-dioxide. Journal of Molecular Structure. 2008;892(1-3):343 - 352. doi:10.1016/j.molstruc.2008.05.054
V.G. B, R.J.F. P, A.M. Bdo Rego. Thin film sulphides and oxides of 3d metals prepared from complex precursors by CVD. Surface and Coatings Technology. 2007;201.
Frija LMT, Reva ID, Gómez-Zavaglia A, Cristiano MLS, Fausto R. Photochemistry and vibrational spectra of matrix-isolated 5-ethoxy-1-phenyl-1H-tetrazole. J Phys Chem A. 2007;111(15):2879-88. doi:10.1021/jp068556h
Frija LMT, Reva ID, Gómez-Zavaglia A, Cristiano MLS, Fausto R. UV-induced photochemistry of matrix-isolated 1-phenyl-4-allyl-tetrazolone. Photochem Photobiol Sci. 2007;6(11):1170-6. doi:10.1039/b703961a
Gómez-Zavaglia A, Reva ID, Frija L, Cristiano MLS, Fausto R. Molecular structure, vibrational spectra and photochemistry of 5-mercapto-1-methyltetrazole. Journal of Molecular Structure. 2006;786(2-3):182 - 192. doi:10.1016/j.molstruc.2005.08.019
Gómez-Zavaglia A, Reva ID, Frija L, Cristiano MLS, Fausto R. Photochemistry of 1-phenyl-tetrazolone isolated in solid argon. Journal of Photochemistry and Photobiology A: Chemistry. 2006;179(3):243 - 255. doi:10.1016/j.jphotochem.2005.08.021
Breda S, Reva I, Lapinski L, Cristiano MLS, Frija L, Fausto R. Photochemical Ring-Opening and Intramolecular Hydrogen Shift Reactions in Sulfur Analogues of α-Pyrone. The Journal of Physical Chemistry A. 2006;110(20):6415 - 6425. doi:10.1021/jp061139k
Frija LMT, Khmelinskii IV, Cristiano MLS. Mechanistic investigations into the photochemistry of 4-allyl-tetrazolones in solution: a new approach to the synthesis of 3,4-dihydro-pyrimidinones. J Org Chem. 2006;71(9):3583-91. doi:10.1021/jo060164j
Gómez-Zavaglia A, Reva ID, Frija L, Cristiano MLS, Fausto R. Molecular Structure, Vibrational Spectra and Photochemistry of 2-Methyl-2 H -Tetrazol-5-Amine in Solid Argon. The Journal of Physical Chemistry A. 2005;109(35):7967 - 7976. doi:10.1021/jp0517706
Frija LMT, Cristiano MLS, Guimarães EMO, Martins NC, Loureiro RMS, Bickley JF. Palladium-catalysed reduction of heteroaromatic naphthyl ethers: Structural effects on reactivity. Journal of Molecular Catalysis A: Chemical. 2005;242(1-2):241 - 250. doi:10.1016/j.molcata.2005.08.022
Araújo NCP, Brigas AF, Cristiano MLS, Frija LMT, Guimarães EMO, Loureiro RMS. Heteroaromatic benzyl ethers as intermediates for palladium-catalysed transfer hydrogenolysis of benzyl alcohols. Journal of Molecular Catalysis A: Chemical. 2004;215(1-2):113 - 120. doi:10.1016/j.molcata.2003.12.033
Cristiano MLS, Gago DJP, Gonsalves AM d'ARo, Johnstone RAW, McCarron M, Varejão JMTB. Investigations into the mechanism of action of nitrobenzene as a mild dehydrogenating agent under acid-catalysed conditions. Organic & Biomolecular Chemistry. 2003;1(3):565 - 574. doi:10.1039/b210887a
Araújo NCP, Barroca PMM, Bickley JF, et al. Structural effects on sigmatropic shifts in heteroaromatic allyl ethersElectronic supplementary information (ESI) available: selected crystal data for compound 7. See Journal of the Chemical Society, Perkin Transactions 1. 2002;(9):1213 - 1219. doi:10.1039/b102674g
Bugalho SCS, Serra AC, Lapinski L, Cristiano MLS, Fausto R. Low temperature matrix-isolation and solid state vibrational spectra of 5-chlorotetrazoleElectronic supplementary information (ESI) available: Calculated molecular geometries, rotational constants, energies and dipole moments. . Physical Chemistry Chemical Physics. 2002;4(10):1725 - 1731. doi:10.1039/b111329c
Bugalho SCS, Lapinski L, Cristiano MLS, Frija LMT, Fausto R. Vibrational spectra and structure of 1-phenyltetrazole and 5-chloro-1-phenyltetrazole. Vibrational Spectroscopy. 2002;30(2):213 - 225. doi:10.1016/S0924-2031(02)00028-0
Bugalho SCS, Maçôas EMS, Cristiano MLS, Fausto R. Low temperature matrix-isolation and solid state vibrational spectra of tetrazole. Physical Chemistry Chemical Physics. 2001;3(17):3541 - 3547. doi:10.1039/b103344c
Cristiano MLS, Brigas AF, Johnstone RAW, Loureiro RMS, Pena PCA. Thermal Rearrangement of 3-Allyloxy-1,2-benzisothiazole 1,1-Dioxides: an Unusual Inversion of Products of Sigmatropic [3,3]-Shift to Give the [1,3]-Isomers. Journal of Chemical Research. 1999;(12):704 - 705. doi:10.1039/a906750g
Lurdes M, Cristiano MLS, Johnstone RAW. A kinetic investigation of the thermal rearrangement of allyloxytetrazoles to N-allyltetrazolones. Journal of the Chemical Society, Perkin Transactions 2. 1997;(3):489 - 494. doi:10.1039/a606376d
Cristiano MLS, Johnstone RAW. Intramolecularity of the Thermal Rearrangement of Allyloxytetrazoles to N-Allyltetrazolones†. Journal of Chemical Research. 1997;(5):164 - 165. doi:10.1039/a608333a
Barkley JV, Cristiano MLS, Johnstone RAW, Loureiro RMS. 3-( E )-But-2-enoxy-1,2-benzisothiazole 1,1-Dioxide: Unusual C—O—C Ether Bond Lengths and Reactivity. Acta Crystallographica Section C Crystal Structure Communications. 1997;53(3):383 - 386. doi:10.1107/S0108270196014151/bm1104sup2.hkl
Cristiano MLS, Johnstone RAW, Price PJ. Metal-assisted reactions. Part 25. Heterogeneous and homogeneous catalytic transfer hydrogenolysis of allyloxytetrazoles to yield alkenes or alkanes. Journal of the Chemical Society, Perkin Transactions 1. 1996;(12):1453. doi:10.1039/p19960001453
Cristiano MLS, Johnstone RAW, Pratt MJ. 3-Hydroxy-2,6-dinitroacetophenone: an Unusual Substitution Pattern Resulting from Nitration of 3-Hydroxyacetophenone. Acta Crystallographica Section C Crystal Structure Communications. 1995;51(12):2581 - 2583. doi:10.1107/S0108270195007451
Tipo de Evento 
Evento Científico
O CCMAR vai acolher o Workshop da ação COST Epigenetic Chemical Biology, a decorrer na Universidade do Algarve, de 18 a 20 de fevereiro.
Seg, 18/02/2019 a Qua, 20/02/2019
Auditório Verde (Green Auditorium) Building 8, Campus de Gambelas, University of Algarve Faro, Portugal