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Synthesis of Some New Antileishmainal Agents Bull. Chem. Soc. Ethiop. 2018, 32(3), 559-570. ISSN 1011-3924 2018 Chemical Society of Ethiopia and The Authors Printed in Ethiopia DOI: https://dx.doi.org/10.4314/bcse.v32i3.14 UTILITY OF AMINO ACID COUPLED 1,2,4-TRIAZOLES IN ORGANIC SYNTHESIS: SYNTHESIS OF SOME NEW ANTILEISHMAINAL AGENTS Ahmed M.M. El-Saghier, Mounir A.A. Mohamed*, Omayma A. Abdalla and Asmaa M. Kadry Chemistry Department, Faculty of Science, Sohag University, Sohag, Egypt (Received May 20, 2018; Revised November 6, 2018; Accepted November 9, 2018) ABSTRACT. Starting from 3-amino-5-(2-hydroxyphenyl) amino acid coupled triazoles 1a-e, new 3-(2- hydroxyphenyl)-3H-imidazo[2,1-c][1,2,4]triazol-6(5H)-one 2a,b, 3b,d, 6a and 3-N-arly(alkyl) amino acid coupled triazoles 4b,d, 7a,c,d,e have been synthesized as potential antileishmanial agents. The structures of the newly synthesized compounds were confirmed using elemental and spectral analyses (FT-IR, 1H-NMR, 13C-NMR and MS). The in vitro antileishmanial potency of the synthesized compounds was evaluated compared to Amphotericin B deoxycholate and miltefosine as lead references. Compounds 2b, 7d and 7e showed perfect IC50 values corresponding to amphotericin B and more patent than miltefosine against L. aethiopica promastigotes. KEY WORDS: Amino acids, Coupled, Imidazo-1,2,4-Triazole, Promatigote, Antileishmanial INTRODUCTION Leishmaniasis occurs as visceral, cutaneous, mucocutaneous and diffused mucocutaneous leishmaniasis and is caused by Leishmania genus and transmitted by bite of infected female sand fly [1]. Leishmania parasites have two basic life stages: an extracellular motile stage (promastigote) inside an invertebrate host and an intracellular non-motile stage (amastigote) inside a vertebrate host [2]. The common form of leishmaniasis is Cutaneous leishmaniasis (CL) which widely distributed all around the world [3]. Within the last decade, the treatment is limited to a few drugs, such as amphotericin B, miltefosine and paromomycin and far from satisfactory [4], although a broad array of species can be responsible to cause leishmaniasis, affecting humans and animals [6-11]. Miltefosine-resistant Leishmania donovani promastigotes also demonstrated modification in sterol biosynthesis and lipid compositions which influences the membrane fluidity and permeability and ultimately may affect drug-membrane interactions [5]. Other possible oral treatments for CL include azole antifungals that show in vitro [12] and in vivo activity against Leishmania [13–20]. Triazoles antifungals inhibit 14α-lanosterol demethylation, causing accumulation of 14α-methyl sterols blocking the synthesis of ergosterol, the main sterol of Leishmania such as fluconazole, eliminating promastigote and amastigote of Leishmania sp. as well as Trypanosoma cruzi, protozoa phylogenetically related to Leishmania [21]. In deeps, imidazo triazole moieties have been widely reported in the mainstream as well as in the patent literature [22-26], also demonstrated dual activity against leishmania [27, 28]. Therefore, as a part of our effort to use a simple and effective method for the synthesis of bioactive imidazo[1,2,4]triazole analogues searching for a new drug candidates for Leishmanial aethiopica promatigote. EXPERIMENTAL Melting points were determined in open-glass capillaries using a Griffin melting point apparatus and are all uncorrected. Infrared spectra (IR) were recorded on Perkin Elmer 1430 infrared spectrophotometer. 1H-NMR and 13C-NMR spectra were scanned on Jeol-400 MHz NMR- __________ *Corresponding author. E-mail: [email protected] This work is licensed under the Creative Commons Attribution 4.0 International License 560 Ahmed M. M. El-Saghier et al. spectrometer (DMSO-d6) and chemical shifts are given in (ppm) down field from tetramethylsilane (TMS) as internal standard. Micro analyses were performed on Vario El Fab- Nr elemental analyzer. Following up of the reactions as performed by thin-layer chromatography (TLC) on silica gel (60GF254) coated Glass plates and the spots were visualized by exposure to iodine Vapors or UV-lamp at 254 nm for few seconds. General procedures for synthesis of compounds 2a,b and 3b,d Method A. To a solution of 2-amino-5(2-hydroxy phenyl)-1,2,4-triazole carboxylic acid 1a,b,d (0.01 mol) and chloroacetyl chloride (1.1 g, 0.01 mol) in acetonitrile, 2 g of potassium carbonate in 1 mL water was added as a base. The reaction mixture was refluxed for 5 h to complete the reaction (monitored by TLC). After completion of the reaction, the reaction mixture was cooled to room temperature and the solid mass was filtered off, washed with water and recrystallized from ethanol. Method B. To a solution of 2-amino-5(2-hydroxy phenyl)-1,2,4-triazole carboxylic acid 1b,d (0.01 mol) and chloroacetyl chloride (1.1 g, 0.01 mol) in chloroform and triethylamine as a catalyst. The reaction refluxed for 7 h to complete the reaction (monitored by TLC). After completion of the reaction, mixture was cooled to room temperature and the solid mass was filtered off and recrystallized from ethanol to give compounds 3b,d. 3-(2-Hydroxyphenyl)-3H-imidazo[2,1-c][1,2,4]triazol-6(5H)-one 2a. Anal. calcd. for C10H8N4O2 (Mr = 216.20): C, 55.50; H, 3.70; N, 25.90. Found: C, 55.17; H, 3.39; N, 25.50. IR (, cm-1); 3404 (broad O–H), 3038 (C–H) aromatic, 2991 (C–H) aliphatic, 1695 (C=O), 1590 1 (C=N). H-NMR (400 MHz; d6-DMSO, ppm); 3.92 (s, 2H, CH2), 3.99 (s, 1H, CH-triazole), 13 6.89-7.89 (m, 4H, ArH), 11.31 (s, 1H, OH, disappeared by D2O), CNMR : 38.62 (CH2), 74.17 (CH-triazole), 114.95, 118.78, 126.58. 128.78, 134.66, 143.05 (ArC), 158.22 (C=N), 170.10 (C=O). MS (m/z+, %): 215.20 (M-2, 0.1); 194.10 (100); 167.10 (21.12); 149.15 (24.99), 133.15 (41.56); 120.10 (30.79); 91.10 (71.73); 65.05 (50.65). 3-(2-Hydroxyphenyl)-3-methyl-3H-imidazo[2,1-c][1,2,4]triazol-6(5H)-one 2b. Anal. calcd. for C11H10N4O2 (Mr = 230.24): C, 52.56; H, 4.34; N, 24.32. Found: C, 52.26; H, 4.05; N, 24.01.IR (, cm-1); 3515 (broad O–H), 3010 (C–H) aromatic, 2991 (C–H) aliphatic, 1713 (C=O), 1227 1 (Ph–O). H NMR (400 MHz; d6-DMSO, ppm); 2.43 (s 3H, CH3), 3.46 (s, 2H, CH2), 6.84-7.62 13 (m, 4H, ArH), 15.42 (s, 1H, OH, disappeared by D2O), CNMR : 14.11 (CH3), 37.62 (CH2), 57.58 (C-triazole), 116.95, 118.23, 125.44, 128.22, 134.45, 129.95 (ArC), 157.75 (C=N), 186.94 (C=O). 2-(2-(2-Hydroxyphenyl)-2-methyl-5-oxo-5,6-dihydro-1H-imidazo[1,2-b][1,2,4]triazol-3(2H)- yl)propanoic acid 3b. Anal. calcd. for C14H16N4O4 (Mr = 304.30): C, 55.20; H, 5.26; N, 18.40. Found: C, 54.87; H, 5.10; N, 18.02.IR (, cm-1); 3408 (broad O–H), 3321 (O–H), 3136 (NH), 3071 (C–H) aromatic, 2981 (C–H) aliphatic, 1714 (C=O), 1617 (COOasy), 1587 (COOsy), 1236 1 (Ph–O). H NMR (400 MHz; d6-DMSO, ppm); 2.55 (S, 3H, CH3), 3.86 (d, 3H, CH3), 4.09 (s, 1H, CH-COOH), 4.10 (s, 2H, CH2), 5.14 (s, 2H, OH, NH, disappeared by D2O), 6.91-7.66 (m, 13 4H, ArH), 14.40 (s, 1H, OH, disappeared by D2O). CNMR: 14.81 (CH3), 30.72 (CH3), 33.53 (CH2), 34.01(CH), 117.47, 118.86, 126.22, 126.86, 128.87, 132.20 (ArC), 163.68 (C=N), 169.27 (C=O), 174.13 (C=O).MS (m/z+, %): 305 (M+1, 2.95); 247 (4.81); 189.10 (6.39); 159.10 (3.70); 117.15 (22.48), 59 (100). 2-(2-(2-Hydroxyphenyl)-2-methyl-5-oxo-5,6-dihydro-1H-imidazo[1,2-b][1,2,4]triazol-3(2H)- yl)-3-(1H-indol-2-yl)propanoic acid 3d. Anal. calcd. for C22H21N5O4 (Mr = 419.43): C, 62.94; H, 5.06; N, 16.68. Found: C, 62.65; H, 5.10; N, 16.42.IR (, cm-1); 3408 (broad O–H), 3321 (O–H), Bull. Chem. Soc. Ethiop. 2018, 32(3) Utility of amino acid coupled 1,2,4-triazoles in organic synthesis 561 3202, 3136 (2NH), 3050 (C–H) aromatic, 2976 (C–H) aliphatic, 1710 (C=O), 1616 (COOasy), 1 1586 (COOsy), 1233 (Ph–O). H NMR (400 MHz; d6-DMSO, ppm); 2.55 (S, 3H, CH3), 3.86 (d, 2H, CH2), 4.09 (s, 1H, CH-COOH), 4.1 (s, 2H, CH2), 5.14 (s, 2H, OH, NH, disappeared by 13 D2O), 6.91-7.66 (m, 8H, ArH), 14.24 (s, 1H, OH, disappeared by D2O). CNMR: 24.81 (CH3), 30.22 (CH2), 33.33 (CH2), 54.01 (CH), 117.47, 118.86, 122.23, 123.11, 125.76, 126.22, 126.86, 128.87, 132.20, 133.44. 136.76, 138.22 (ArC), 153.66 (C=N), 168.22 (C=O), 174.10 (C=O). General procedure for synthesis of compounds 4b,d To a solution of 2-amino-5(2-hydroxy phenyl)-1,2,4-triazole carboxylic acid 1a,d (0.01 mol) and 4-chlorobenzoyl chloride (1.28 mL, 0.01 mol) in chloroform and a catalytic amount of triethylamine as a catalyst. The reaction component was refluxed for 7 hrs to complete the reaction (monitored by TLC). After completion of the reaction, mixture was cooled to room temperature and the solid mass of the compounds was filtered off and recrystallized from ethanol.
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