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Grbović LM, Pavlović KJ, Jovanović-Šanta SS, Vasiljević BR. Microwave-Assisted Synthesis of Bile Acids Derivatives: An Overview. CURR ORG CHEM 2019. [DOI: 10.2174/1385272823666190213114104] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
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The first attempts at microwave-assisted (MW) syntheses of bile acid derivatives
were performed in domestic MW appliances. However, the reproducibility of these
syntheses, which were performed in uncontrolled conditions, was very low. In the first
part of this overview, compounds synthesized under such conditions are presented. Consequently,
with the development of MW technology, MW-assisted reactions in MW reactors
became reproducible. Thus, in the second part of this review, syntheses of bile acidsbased
compounds in MW reactors are presented. Among others, publications dealing with
the following topics will be covered:
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− Chemical transformations of hydroxyl and/or carboxyl functions of bile acids into
esters or amides,
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− Hydroxyl group oxidations,
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− Derivatization of oxo-compounds with different nitrogen-containing compounds (e.g. 4-amino-3-
substituted-1H-1,2,4-triazole-5-thiones, thiocarbohydrazides and thiosemicarbazides)
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Bile acid-based molecular tweezers, capable of stereospecific molecular recognition
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Reactions of hydroxyl functions to give chlorine derivatives, presenting reactive intermediates in substitution
reactions with N- or O-containing nucleophilic arylhydrazides, urea derivatives, substituted thiadiazoles or
triazoles or amino acid methyl esters, mainly in solvent-free conditions.
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Some of the synthesized compounds expressed antimicrobial potential and/or good recognition properties as
artificial receptors for specific amino acids or anions.
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Detailed comparisons between conventional and MW-assisted procedures for chemical transformations of bile
acids are given in most of the presented publications. Based on these results, MW irradiation methods are simpler,
more efficient, cleaner and faster than conventional synthetic methods, meeting the requirements of green
chemistry.
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Affiliation(s)
- Ljubica M. Grbović
- Department of Chemistry, Biochemistry and Environmental Protection, University of Novi Sad, Faculty of Sciences, Trg Dositeja Obradovica 3, 21000 Novi Sad, Serbia
| | - Ksenija J. Pavlović
- Department of Chemistry, Biochemistry and Environmental Protection, University of Novi Sad, Faculty of Sciences, Trg Dositeja Obradovica 3, 21000 Novi Sad, Serbia
| | - Suzana S. Jovanović-Šanta
- Department of Chemistry, Biochemistry and Environmental Protection, University of Novi Sad, Faculty of Sciences, Trg Dositeja Obradovica 3, 21000 Novi Sad, Serbia
| | - Bojana R. Vasiljević
- Department of Chemistry, Biochemistry and Environmental Protection, University of Novi Sad, Faculty of Sciences, Trg Dositeja Obradovica 3, 21000 Novi Sad, Serbia
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Niu P, Kang J, Tian X, Song L, Liu H, Wu J, Yu W, Chang J. Synthesis of 2-amino-1,3,4-oxadiazoles and 2-amino-1,3,4-thiadiazoles via sequential condensation and I2-mediated oxidative C–O/C–S bond formation. J Org Chem 2015; 80:1018-24. [PMID: 25506709 DOI: 10.1021/jo502518c] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
2-Amino-substituted 1,3,4-oxadiazoles and 1,3,4-thiadiazoles were synthesized via condensation of semicarbazide/thiosemicarbazide and the corresponding aldehydes followed by I2-mediated oxidative C–O/C–S bond formation. This transition-metal-free sequential synthesis process is compatible with aromatic, aliphatic, and cinnamic aldehydes, providing facile access to a variety of diazole derivatives bearing a 2-amino substituent in an efficient and scalable fashion.
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