Synthesis of acyclovir and HBG analogues having nicotinonitrile and its 2-methyloxy 1,2,3-triazole

Synthesis, X-ray diffraction, and computational studies of acyclovir and HBG analogs derived from Triazolyl-1,4-benzothiazine and their oxidized forms for breast cancer and SARS-CoV-2

This study presents a simple and efficient synthetic method for preparing a new series of acyclonucleosides derived from 1,4-benzothiazine and 1,4-benzothiazine-1,1-dioxide. These compounds feature the introduction of a 1,2,3-triazole-4-ylmethyl ring as a spacer between the heterocyclic bases and the pseudosugars of acyclovir (ACV) and hydroxybutylguanine (HBG). The acyclonucleosides were synthesized through copper-catalyzed 1,3-dipolar cycloaddition reactions between azides 8a and 8b and the N4-propargyl base 7. Following this, the deprotection of the acyclic chains and the oxidation of the sulfur to sulfone afforded the acyclonucleosides 9a,b-12a,b in satisfactory yields. The synthesized acyclonucleosides were characterized using 1H and 13C NMR spectroscopy. Moreover, the structure of 9b was confirmed by single-crystal X-ray diffraction analysis. The synthesized acyclonucleosides were evaluated through in silico studies, including network pharmacology for bioactivity, toxicity prediction, physicochemical properties, and ADMET analysis. Molecular docking studies revealed significant interactions, highlighting compound 11b's favorable binding with the target protein AKT1, achieving a binding energy of -6.43 kcal/mol, which is close to the Capivasertib standard. Similarly, compound 12b showed interactions akin to hydroxychloroquine, with a binding energy of -6.29 kcal/mol for the SARS-CoV-2 target protein. Molecular dynamics simulations further validated the stability of the ligand-protein complexes during 200 ns, as evidenced by acceptable RMSD and RMSF and Rg values. The post-dynamic, MMGBSA, PCA, FEL, PDF, and DCCM analyses of the AKT and SARS-CoV-2 protein-ligand complexes have provided comprehensive insights into their interactions with standard drugs, binding affinities, conformational dynamics, and structural stability. These studies are crucial for understanding the molecular mechanisms underlying drug efficacy and resistance, thereby informing the rational design of new inhibitors targeting AKT and SARS-CoV-2 proteins. Finally, the two most promising compounds, 11b and 12b, selected from the docking results, were analyzed using Density Functional Theory (DFT). These analyses revealed significant variations in their electronic properties, providing valuable insights into their reactivity, stability, and polarity.

Synthesis of novel pyridine and pyrazolyl pyridine conjugates with potent cytotoxicity against HepG2 cancer cells as PIM-1 kinase inhibitors and caspase activators

A novel series of nicotinonitrile and pyrazolyl nicotinonitrile were synthesized, and their PIM-1 kinase inhibitors and caspase activators were investigated. New Manich bases 6-8 were synthesized via reaction of pyridine 4 with piperidine, dimethyl amine, and morpholine in the presence of formalin. On the other hand, the pyrazolyl analogues 10-12 were synthesized via heterocyclization of acetohydrazide derivative 9 with acetylacetone, malononitrile, and ethyl cyanoacetate, respectively, in ethanol. The cytotoxic activity of compound 9 against MCF-7 and HepG2 cells was particularly noteworthy, with IC50 values of 0.34 μM and 0.18 μM, respectively, among these derivatives. Compared to staurosporine with potent PIM-1 kinase inhibition, which had an IC50 value of 16.7 nM and an inhibition of 95.6%, compound 9 had a strong inhibitory effect, with IC50 values of 20.4 nM and 93.8%. It induced apoptosis activity in HepG2 cancer cells. Accordingly, compound 9 was proven to be an effective chemotherapeutic drug that targets PIM-1 in treating liver cancer.

Green synthesis of triazolo-nucleoside conjugates via azide–alkyne C–N bond formation

Modified nucleosides are the core precursors for the synthesis of artificial nucleic acids, and are important in the field of synthetic and medicinal chemistry. In order to synthesize various triazolo-compounds, copper and ruthenium catalysed azide–alkyne 1,3-dipolar cycloaddition reactions also known as click reaction have emerged as a facile and efficient tool due to its simplicity and convenient conditions. Introduction of a triazole ring in nucleosides enhances their therapeutic value and various photophysical properties. This review primarily focuses on the plethora of synthetic methodologies being employed to synthesize sugar modified triazolyl nucleosides, their therapeutic importance and various other applications.

Preparation and Uses of Chlorinated Glycerol Derivatives

Crude glycerol (C3H8O3) is a major by-product of biodiesel production from vegetable oils and animal fats. The increased biodiesel production in the last two decades has forced glycerol production up and prices down. However, crude glycerol from biodiesel production is not of adequate purity for industrial uses, including food, cosmetics and pharmaceuticals. The purification process of crude glycerol to reach the quality standards required by industry is expensive and dificult. Novel uses for crude glycerol can reduce the price of biodiesel and make it an economical alternative to diesel. Moreover, novel uses may improve environmental impact, since crude glycerol disposal is expensive and dificult. Glycerol is a versatile molecule with many potential applications in fermentation processes and synthetic chemistry. It serves as a glucose substitute in microbial growth media and as a precursor in the synthesis of a number of commercial intermediates or fine chemicals. Chlorinated derivatives of glycerol are an important class of such chemicals. The main focus of this review is the conversion of glycerol to chlorinated derivatives, such as epichlorohydrin and chlorohydrins, and their further use in the synthesis of additional downstream products. Downstream products include non-cyclic compounds with allyl, nitrile, azide and other functional groups, as well as oxazolidinones and triazoles, which are cyclic compounds derived from ephichlorohydrin and chlorohydrins. The polymers and ionic liquids, which use glycerol as an initial building block, are highlighted, as well.

Synthesis and Bioactivity of Novel Trisubstituted Triazole Nucleosides

A series of novel trisubstituted 1,2,3-triazole purine nucleosides were efficiently synthesized via Huisgen 1,3-dipolar cycloaddition in good yields. Bioactivity against cytomegalovirus (CMV) and varicella-zoster virus (VZV) in human embryonic lung cell cultures was evaluated and all compounds show low antiviral activity.

Synthesis and antimicrobial activity of some 2-pyridone nucleosides containing a sulfonamide moiety

Glycosylation of 2-pyridonesulfonamide 1a,b with glycosyl/galactosyl bromide gave the corresponding glycosides 2a,b, 3a,b, 6a,b, and 7a,b, respectively. Deacetylation of the resulting glycosides gave the corresponding glycosides 4a,b, 5a,b, 8a,b, and 9a,b, respectively, in good yields. Furthermore, reaction of 2-pyridonesulfonamide 1b with lactosyl bromide gave a mixture the corresponding N, O-lactosides 10 and 11, which were deacetylated to give the corresponding glycosides 12 and 13, respectively. The structures of the new synthesized compounds were characterized by using IR, 1H, 13C NMR spectra, and microanalysis. Selected members of these compounds were screened for antimicrobial activity.

Synthesis and biological activity of some nucleoside analogs of hydroquinoline-3-carbonitrile

Hydroquinoline acyclonucleosides 2, 4, 6a,b, 8a,b, 9a,b, and their corresponding N-alkyl derivatives (10-12) were obtained by the reaction of 1a,b with acetoxybutylbromide, (2-acetoxyethoxy)methyl bromide, 3-chloropropanol, 1,3-dichloro-2-propanol, epichlorohydrin, propargyl/allyl bromides in the presence of K(2)CO(3) in dry dimethylformamide (DMF). In a similar manner, reaction of 1a,b with glycosyl/galactosyl and lactosyl bromide afforded the corresponding N-nucloside derivatives 13a,b, 15a,b, and 17, respectively. Deacetylation of the N-nucleosides derivatives in the presence of Et(3)N/MeOH and few drops of water gave the deprotected derivatives 3, 5, 7a,b, 14a,b, 16a,b, and 18 in good yields, respectively. All the newly synthesized compounds are elucidated by infrared, (1)H, (13)C NMR and elemental analyses. Some of these compounds were screened for antimicrobial activities.

Synthesis and biological evaluation of 2-oxonicotinonitriles and 2-oxonicotinonitrile based nucleoside analogues

Drug resistance and emergence of new pathogens highlight the need for developing new therapeutic agents. We focused on 2-oxonicotinonitrile (2-ONN) as derivative of the natural product 2-pyridinone.1 Herein, we describe the synthesis of 2-ONNs bearing two aryl groups, which we coupled with organohalides, including three glycosyl bromides, to prepare the nucleoside analogues. Coupling occurred mostly at the 2-ONN ring nitrogen to give the aimed targets, and in a few cases, it happened at the 2-oxo position giving O-alkylation products. Free 2-ONNs and their acetylated nucleosides were tested against a number of viruses. The nucleoside analogue 2a_Ac showed good anti SARS-CoV and anti influenza A (H₅N₁) activities. Additionally, 7b had good activity against Gram positive bacterium, Bacillis subtilis.

•

2-Oxonicotinonitriles with two aryl groups were coupled with several organohalides.

•

The coupling occurred mostly at the ring nitrogen.

•

In a few cases, the coupling occurred at the 2-oxo position.

•

Antimicrobial and antiviral activities were tested for acetylated and free compounds.

•

One nucleoside analogue showed good anti SARS and anti influenza activity.