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Harisha MB, Dhanalakshmi P, Suresh R, Kumar RR, Muthusubramanian S. Access to highly substituted oxazoles by the reaction of α-azidochalcone with potassium thiocyanate. Beilstein J Org Chem 2020; 16:2108-2118. [PMID: 32952727 PMCID: PMC7476590 DOI: 10.3762/bjoc.16.178] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Accepted: 08/21/2020] [Indexed: 12/27/2022] Open
Abstract
The reactivity of α-azidochalcones has been explored for the preparation of highly substituted oxazoles via a 2H-azirine intermediate. The azidochalcones, when treated with potassium thiocyanate in the presence of potassium persulfate, lead to 2,4,5-trisubstituted oxazoles in good yields. Incidentally, 2-aminothiazoles are the products when ferric nitrate is employed instead of persulfate in the above reaction.
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Affiliation(s)
- Mysore Bhyrappa Harisha
- Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai-625 021, Tamil Nadu, India.,Eurofins-Advinus Limited, Phase II, Peenya Industrial Area, Bangalore-560 058, India
| | - Pandi Dhanalakshmi
- Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai-625 021, Tamil Nadu, India.,Department of Inorganic and Physical Chemistry, Indian Institute of Science (IISc), Bangalore-560 012, India
| | - Rajendran Suresh
- Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai-625 021, Tamil Nadu, India
| | - Raju Ranjith Kumar
- Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai-625 021, Tamil Nadu, India
| | - Shanmugam Muthusubramanian
- Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai-625 021, Tamil Nadu, India
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Dhanalakshmi P, Shanmugam S. α-Aroylidineketene dithioacetal chemistry: CuI catalyzed synthesis of 2-styryl benzimidazoles enroute to regioselective hydrothiolation. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.06.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Stuchlíková L, Matoušková P, Bártíková H, Vokřál I, Lamka J, Štolcová T, Pětníková H, Szotáková B, Kubíček V, Skálová L. Monepantel induces hepatic cytochromes p450 in sheep in vitro and in vivo. Chem Biol Interact 2015; 227:63-8. [DOI: 10.1016/j.cbi.2014.12.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 12/04/2014] [Accepted: 12/16/2014] [Indexed: 10/24/2022]
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Stuchlíková L, Jirásko R, Vokřál I, Lamka J, Spulák M, Holčapek M, Szotáková B, Bártíková H, Pour M, Skálová L. Investigation of the metabolism of monepantel in ovine hepatocytes by UHPLC/MS/MS. Anal Bioanal Chem 2012. [PMID: 23183590 DOI: 10.1007/s00216-012-6584-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Monepantel (MOP) belongs to a new class of anthelmintic drugs known as aminoacetonitrile derivatives. It was approved for use in veterinary practice in Czech Republic in 2011. So far, biotransformation and transport of MOP in target animals have been studied insufficiently, although the study of metabolic pathways of anthelmintics is very important for the efficacy of safety of therapy and evaluation of the risk of drug-drug interactions. The aim of this study was to identify MOP metabolites and to suggest the metabolic pathways of MOP in sheep. For this purpose, primary culture of ovine hepatocytes was used as a model in vitro system. After incubation, medium samples and homogenates of hepatocytes were extracted separately using solid-phase extraction. Analysis was performed using a hybrid quadrupole-time-of-flight analyzer with respect to high mass accuracy measurements in full scan and tandem mass spectra for the confirmation of an elemental composition. The obtained results revealed S-oxidation to sulfoxide and sulfone and arene hydroxylation as MOP phase I biotransformations. From phase II metabolites, MOP glucuronides, sulfates, and acetylcysteine conjugates were found. Based on the obtained results, a scheme of the metabolic pathway of MOP in sheep has been proposed.
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Affiliation(s)
- Lucie Stuchlíková
- Department of Biochemical Sciences, Faculty of Pharmacy in Hradec Králové, Charles University in Prague, Hradec Králové, Czech Republic
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Hilário VC, Carrão DB, Barth T, Borges KB, Furtado NAJC, Pupo MT, de Oliveira ARM. Assessment of the stereoselective fungal biotransformation of albendazole and its analysis by HPLC in polar organic mode. J Pharm Biomed Anal 2012; 61:100-7. [DOI: 10.1016/j.jpba.2011.12.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2011] [Revised: 12/11/2011] [Accepted: 12/13/2011] [Indexed: 11/17/2022]
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Capece BP, Virkel GL, Lanusse CE. Enantiomeric behaviour of albendazole and fenbendazole sulfoxides in domestic animals: Pharmacological implications. Vet J 2009; 181:241-50. [DOI: 10.1016/j.tvjl.2008.11.010] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2008] [Revised: 11/05/2008] [Accepted: 11/17/2008] [Indexed: 11/16/2022]
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Capece B, Afonso S, Lazáro R, Harun M, Godoy C, Castells G, Cristòfol C. Effect of age and gender in the pharmacokinetics of albendazole and albendazole sulphoxide enantiomers in goats. Res Vet Sci 2009; 86:498-502. [DOI: 10.1016/j.rvsc.2008.08.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2007] [Revised: 05/19/2008] [Accepted: 08/04/2008] [Indexed: 10/21/2022]
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Skálová L, Krízová V, Cvilink V, Szotáková B, Storkánová L, Velík J, Lamka J. Mouflon (Ovis musimon) dicrocoeliosis: Effects of parasitosis on the activities of biotransformation enzymes and albendazole metabolism in liver. Vet Parasitol 2007; 146:254-62. [PMID: 17386978 DOI: 10.1016/j.vetpar.2007.02.026] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2006] [Revised: 02/16/2007] [Accepted: 02/21/2007] [Indexed: 11/15/2022]
Abstract
Parasitic infections can modify the host's ability to metabolize drugs and other xenobiotics by altering the biotransformation enzymes; these changes may have various pharmacological, toxicological or physiological consequences. In our study, several activities of liver biotransformation enzymes and in vitro metabolism of albendazole (ABZ) were tested and compared in non-infected mouflons (Ovis musimon) and in mouflons infected by lancet fluke (Dicrocoelium dendriticum). Subcellular fractions of liver homogenates were isolated from 5+5 mouflon rams (1-year-old) parasitologically negative or naturally infected by fluke. From the eight enzyme activities that were assayed, only two activities significantly differ in the case of Dicrocoelium-infected versus non-infected animals. In infected mouflons, a significant increase (53%) of thiobenzamide-S-oxidase (TBSO) activity, corresponding mainly to the activity of flavine monooxygenase (FMO), and significant decrease (60%) of glutathione-S-transferase (GST) activity was observed. In addition, dicrocoeliosis caused the enhancement of ABZ hepatic biotransformation. The velocity of the formation of (+)-ABZ sulfoxide and ABZ sulfone was significantly increased. However, the shifts in ABZ biotransformation were very mild that undesirable alterations in ABZ pharmacokinetic are not expected. From this point of view, the use of ABZ in the therapy of mouflon dicrocoeliosis in young animals can be recommended. The treatment of the same mouflons by other drugs that are mainly conjugated with glutathione, seems to be more problematic; hence, all consequences of documented reduced GST activity should be accounted.
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Affiliation(s)
- L Skálová
- Charles University in Prague, Faculty of Pharmacy, Heyrovského 1203, Hradec Králové, Czech Republic.
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Velík J, Baliharová V, Skálová L, Szotáková B, Wsól V, Lamka J. Liver microsomal biotransformation of albendazole in deer, cattle, sheep and pig and some related wild breeds. J Vet Pharmacol Ther 2005; 28:377-84. [PMID: 16050818 DOI: 10.1111/j.1365-2885.2005.00671.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Albendazole (ABZ) biotransformation was studied in vitro in liver microsomes of adult noncastrated male farm animals (ram, buck, bull and boar), castrated adult males (wether, billy and hog), and free living males (fallow buck, red deer stag, mouflon ram, roe buck and wild boar). Liver microsomal fractions were incubated with either ABZ or racemic albendazole sulphoxide (ABZSO). ABZ was extensively metabolized to the (+) and (-) enantiomers of ABZSO, whereas ABZSO underwent a slow oxidation to albendazole sulphone (ABZSO2) in all species. In all species both ABZSO enantiomers were detected. The chiral ratio, (+)-ABZSO/(-)-ABZSO, was greater than one in farm animals, mouflon and wild boar, and less than one in three species of deer. For total ABZ sulphoxidation, deer like species had lower values compared to the other species. Mouflon ram and ram had lower total sulphoxidation rates compared to wethers, as well as ABZ suphoxidation towards (+)-ABZSO. No significant difference occurred comparing ABZSO formation in mouflon ram and ram, but ABZSO2 formation rate in mouflon ram was higher than in rams and wethers. Roe deer stag, fallow buck and red deer stag did not differ in both total-ABZSO and (-)-ABZSO synthesis rates and roe deer stag and fallow buck did not differ in synthesis rates of (+)-ABZSO and ABZSO2. The bull differed from other species in all metabolites studied, except for red deer stag and boar in (-)-ABZSO synthesis rate. The extent of ABZSO sulphonation to ABZSO2 in bull microsomes was more than twice that of other species.
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Affiliation(s)
- J Velík
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Charles University, Heyrovského, Hradec Králové, Czech Republic.
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Velík J, Szotáková B, Baliharová V, Lamka J, Savlík M, Wsól V, Snejdrová E, Skálová L. Albendazole repeated administration induces cytochromes P4501A and accelerates albendazole deactivation in mouflon (Ovis musimon). Res Vet Sci 2005; 78:255-63. [PMID: 15766946 DOI: 10.1016/j.rvsc.2004.08.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/10/2004] [Indexed: 11/28/2022]
Abstract
Adult mouflon ewes (Ovis musimon) were treated repeatedly with therapeutic doses of albendazole (ABZ, p.o. 7.5 mg/kg of body weight/day, for five consecutive days). Animals (treated or control) were sacrificed 24 h after the fifth dose of ABZ and liver and small intestine were collected to prepare microsomes. The activities of several biotransformation enzymes were measured in both hepatic and intestinal microsomes. A significant increase in the activity and amount of cytochromes P4501A (CYP1A) was observed in both tissues of ABZ treated mouflons compared to control animals. No other biotransformation enzymes tested were affected by five ABZ doses. The in vitro biotransformation of ABZ was studied in hepatic and intestinal microsomes from ABZ treated and control mouflons. Concentrations of two main ABZ metabolites - pharmacologically active ABZ sulfoxide and pharmacologically inactive ABZ sulfone were analysed using HPLC. A significant increase in rate of formation of ABZ sulfone (which is catalysed by CYP1A) was observed in hepatic as well as in intestinal microsomes from ABZ treated animals. The enhancement of ABZ deactivation by its repeated administration may affect the anthelmintic efficacy of this drug and may contribute to the development of parasite resistance.
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Affiliation(s)
- J Velík
- Faculty of Pharmacy, Department of Biochemical Sciences, Charles University, Heyrovského 1203, Hradec Králové, Czech Republic
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