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Advanced Catalysis and Synthesis for Sustainable and Environmental Processes

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Volume 2021 |Article ID 4209514 | https://doi.org/10.1155/2021/4209514

Anand K. Agrahari, Sunil Kumar, Anindra Sharma, Vinod K. Tiwari, "Dinuclear Copper(I) Thiodiacetate Complex-Mediated Expeditious Synthesis of the Chlorine-Containing Cyclen-Cored 36-Glucose-Coated Glycodendrimer", Journal of Chemistry, vol. 2021, Article ID 4209514, 10 pages, 2021. https://doi.org/10.1155/2021/4209514

Dinuclear Copper(I) Thiodiacetate Complex-Mediated Expeditious Synthesis of the Chlorine-Containing Cyclen-Cored 36-Glucose-Coated Glycodendrimer

Academic Editor: Hu Li
Received20 Sep 2021
Revised08 Oct 2021
Accepted15 Oct 2021
Published27 Oct 2021

Abstract

High-sugar-tethered glycodendrimers are a remarkable tool in glycobiology for the investigation of carbohydrate-protein interaction using its multivalency property. An enthralling double-stage convergent synthetic approach was selected to build a novel class of chlorine-containing glucose-coated dendrimers using an efficient click catalyst ‘dinuclear copper(I) thiodiacetate complex.’ In this context, cyclen core was developed through a divergent approach, while the glucodendron was developed via a convergent approach independently. Both azide-alkyne partners were coupled through a modular copper azide-alkyne cycloaddition (CuAAC) strategy to afford a high yield of the desired 36-glucose-coated glycodendrimer. The synthesized glycodendrimer has been elucidated by NMR, gel permeation chromatography (GPC), and IR spectral analysis.

1. Introduction

Glycodendrimer chemistry is an increasingly important area to overcome the low affinity and specificity of monosaccharide ligands mainly because of its multivalency effect [13]. As we know, multivalent carbohydrate-protein interaction regulates numerous biological processes such as cell recognition, cellular adhesion, pathogen invasion, and fertilization [48]. The suffice structural diversity of carbohydrates along with their remarkable features such as hydrophilicity, biocompatibility, less toxicity, and superior ADME (absorption, distribution, metabolism, and excretion) properties encouraged the scientist towards the construction of sugar-tethered dendrimers, i.e., glycodendrimers [1, 9, 10]. Glycodendrimers, because of several notable features such as their high number of sugar appendages at the periphery, enhanced monodispersity, and, moreover, the possibility to organize their well-defined size, have been captivated over the other class of multivalent glycoclusters [1116]. Cyclen core is well investigated for its wide application in the field of chemical biology and biomedicine [17]. In recent years, cyclen and related macrocyclic polyamines have been greatly explored as a promising vehicle of radio nuclides in radio immunotherapy (RIT), single-photon emission computed tomography (SPECT), and positron [18]. The easy N-alkylation of cyclens facilitates significant alteration in the macrocycles for the development of promising hypercore of wide applications [1921]. Therefore, several chemical ligation tools have been reported for the successful synthesis of glycodendrimer [2229].

Among the other applied protocols including chemical ligation, Michael addition, and acid-amine coupling, copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) reaction, i.e., click chemistry, is one of the most reliable, adaptable, efficient, high-yielding, and proficient tool for an easy access of regioselective glycohybrids, glycoconjugates, and neoglycoconjugates [1, 27, 30]. In most of the cases, clicking of azides and alkynes was executed simply by using the CuSO4/NaAsc catalytic system in the aqueous condition, which is especially favorable in terms of yields and regioselectivity [30]. However, it has few shortcomings as it requires higher quantity and prolonged time, has insufficient stability, and has the reducing nature of NaAsc that may also facilitate some other unwanted reactions with proteins in biological systems [31]. Thus, there is an increased demand of suitable click catalysts for efficient CuAAC coupling. Towards this end, a number of promising such catalysts such as mono- and dinuclear heteroleptic Cu(I) dithio-PPh3 complexes [32], di- and mononuclear heteroleptic Cu(I) dixanthate/xanthate-phosphine complexes [33], heteroleptic [Cu(PPh3)2(β-oxodithioester)] complexes [34], thiocarboxylate complexes, and cubane-based hydrosulfide complexes of Cu(I) [35] were displayed efficient catalytic activities for the click conjugation with carbohydrates. Among all, a highly stable Cu(I) catalyst [(PPh3)2Cu(μ-tda)Cu(PPh3)2].6H2O with significant catalytic activity has been copiously exploited for the thriving construction of regioselective 1,4-disubstituted dendritic architectures [36].

As reported in the literature, the chlorine atoms occupy a special position in a variety of potent natural products such as the antibiotics vancomycin, clindamycin, chloramphenicol, and griseofulvin [37, 38]. Thus, this inclusion of chlorine atoms into one or more definite loci of a biologically active scaffold may enhance the inherent biological activity [39]. The chlorinated compounds might increase the lipophilicity of the whole molecule towards lipophilic domains of a protein which prompts an increased local concentration of the said compound near a biological target site. Until now, only a few literature reports are available to develop high-functional chlorine-containing glycodendrimers [40]. The notable lead of such type of glycocluster is the amplified functional group concentration in the reduced generation which unfolds a key domain for the sugar-lectin interaction [41, 42]. Therefore, we envisaged constructing 36-glucose-coated chlorine-containing dendrimers of G1 generation (Figure 1) using the copper catalyst ‘dinuclear copper(I) thiodiacetate complex’ in standard click ambience.

2. Experimental

2.1. General Experimental Procedure for the Cu(I)-Catalyzed Click Reaction

Polypropargylated terminal alkyne and its counterpart organic azide and catalyst 9 (0.02 equiv. or 2 mol% per propargyl) were stirred in dry CH2Cl2 for 3 h. The completion of the reaction was monitored by TLC; upon completion of the reaction, the solvent was removed under reduced pressure to obtain the crude product. The resulting crude mass was purified using flash column chromatography to afford the targeted glycoconjugates.

2.2. Synthetic Procedure of Methyl 3,4,5-Tris (Hydroxyl) Benzoate (2) [29]

3,4,5-Tris (hydroxyl) benzoic acid 1 (5.0 g, 32.4 mmol) was dissolved in dry methanol (80 mL); thereafter, the catalytic amount of conc. H2SO4 (1.0 mL) was added dropwise in the cold condition. Furthermore, the reaction was set to reflux for 5 h. After the consumption of the starting material on TLC, the resulting reaction mixture was condensed under in vacuo followed by extraction. Thus, ethyl acetate (100 mL) was added to the obtained crude mass and washed with NaHCO3 solution (2 × 50 mL), dried over anhydrous Na2SO4, filtered, and again evaporated to furnish the targeted scaffold 2 in good yield. The physical data (NMR) of compound 2 were closely matched with the reported literature.

2.3. Synthetic Procedure of Methyl 3,4,5-Tris (Propargyloxy) Benzoate (3) [29]

The said compound was synthesized as reported in the literature. Spectroscopic data were matched with the earlier reported literature.

2.4. Synthetic Procedure for 3,4,5-Tris (Propargyloxy) Phenyl Methanol (4) [40]

To a stirred solution of anhydrous THF (40 mL), LiAlH4 (0.45 g, 11.8 mmol, 1.2 equiv) was added at followed by portion-wise addition of ester 3 (3.0 g, 10.05 mmol) in a period of 15 min maintaining the said temperature. Then, the reaction was set to stir for 6 h at room temperature until the completion of the reaction (monitored by TLC). The resulting reaction mixture was quenched by 5% aq. NaOH, and then the resulting precipitate was filtered out; the resulting filtrate was extracted with ethyl acetate and washed with water (2 × 20 mL) followed by brine wash. The obtained organic layer was evaporated under reduced pressure, and the resulting crude mass was loaded to column chromatography to furnish the targeted compound 4. Spectroscopic data were matched with the earlier reported literature.

2.5. Synthesis of AB3 Dendritic Monomer (5) [40]

3,4,5-Tris (propargyloxy) phenyl methanol 3 (2.0 g, 7.39 mmol) was taken in a round bottom flask, and sulfuryl chloride (7.17 mL, 12.0 equiv) was added and stirred for 30 minutes at rt. Thereafter, the completion of the reaction was monitored by TLC, the reaction mixture was diluted, was then neutralized with 20% aq. NaOH at , and was extracted with ethyl acetate (50 mL), dried over anhydrous Na2SO4, and filtered, and the solvent was evaporated in vacuo (). The obtained residue was refined by flash column chromatography (SiO2) to furnish the desired compound 5. Yield (2.06 g, 78%); Rf = 0.5 (15% EtOAc/n-hexane); 1H-NMR (500 MHz, CDCl3): δ = 4.87 (s, 4H, 2 × −OCH2), 4.81 (s, 4H, 2 × −CH2), 2.57–2.56 (m, 1H, acetylenic-H), 2.54–2.53 (m, 2H, 2 × acetylenic-H); 13C-NMR (125 MHz, CDCl3): δ = 147.0, 146.3, 129.9, 126.3, 77.86, 77.83, 76.6, 76.4, 61.2, 61.0, and 41.1 ppm.

2.6. Synthesis of 12-Alkynyl-Functionalized Hypercore (7) [40]

1,3-Dichloro-2-(chloromethyl)-4,5,6-tris (propargyloxy) benzene 5 (187 mg, 0.522 mmol, 4.5 equiv) reacted with macrocycle cyclen unit 6 (20 mg, 0.116 mmol, 1.0 equiv) under the mixture of aqueous 1 M NaOH (15 mL) and CH3CN (15 mL). The reaction was allowed to stir for 12 h at room temperature (the progress of the reaction was monitored by TLC), and then it was extracted with ethyl acetate (2 × 20 mL). The organic layer was collected, dried over Na2SO4, and filtered, and the solvent was evaporated under in vacuo (). The resulted residue was loaded to column chromatography to furnish the desired hypercore 7 in good yield. Yield (111 mg, 66%); Rf = 0.3 (25% EtOAc/n-hexane); 1H-NMR (500 MHz, CDCl3): δ = 4.83 (d, J = 2.0 Hz, 8H, 4 × −NCH2Ar), 4.78–4.77 (m, 16H, cyclen-H), 3.64 (s, 8H, 4 × −OCH2), 2.77 (s, 16H, 8 × −OCH2)), 2.51–2.49 (m, 12H, acetylenic-H); 13C-NMR (125 MHz, CDCl3): δ = 146.5, 145.0, 132.1, 127.1, 78.2, 78.1, 76.3, 76.2, 61.1, 60.8, 54.9, and 50.7 ppm.

2.7. Synthetic Protocol of 2,3,4,6-Tetra-O-acetyl-β-D-glucopyranosyl Azide (8) [16]

Compound 8 was synthesized as reported in the literature, and the spectral data were well elucidated.

2.8. Synthesis of Catalyst [(PPh3)2Cu(μ-tda)Cu(PPh3)2].6H2O (9) [36]

The catalyst was synthesized as earlier reported in the literature, and spectral data were closely matched with the reference sample.

2.9. Synthesis of the Chlorine-Functionalized Glucodendron (10)

Compound 1,3-dichloro-2-(chloromethyl)-4,5,6-tris (propargyloxy) benzene 5 (0.1 g, 0.279 mmol) reacted with 2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl azide 8 (417 mg, 1.11 mmol, 4.0 equiv.) using catalyst 9 (24.6 mg, 0.06 equiv.) under dry CH2Cl2 solvent according to the general procedure. The obtained crude mass was subjected to flash column chromatography (SiO2) to form chlorine-functionalized glycoconjugate 10 in good yield. Yield (346 mg, 84%) Rf = 0.4 (50% ethyl acetate/n-hexane); 1H-NMR (500 MHz, CDCl3): δ = 8.34 (s, 1H, triazolyl-H), 8.21 (s, 2H, 2 × triazolyl-H), 6.07 (d, J = 9.5 Hz, 2H, H1), 5.97 (d, J = 9.5 Hz, 1H, H1), 5.59–5.52 (m, 3H, H3), 5.44–5.27 (m, 10H, H2, –CH2Ar), 4.69–4.68 (m, 2H, H2, H4), 4.27–4.24 (m, 3H, H4, H6a), 4.15–4.04 (m, 8H, H5, H6), 2.05 (s, 8H, −COCH3), 2.01–2.0 (m, 16H, 8 × −COCH3), 1.92 (s, 5H, −COCH3), 1.84–1.81 (m, 7H, −COCH3); 13C-NMR (125 MHz, CDCl3): δ = 170.5, 170.4, 169.99, 169.94, 169.5, 169.4, 168.9, 168.7, 147.0, 146.9, 143.9, 143.4, 130.0, 126.1, 122.8, 122.7, 85.6, 85.5, 75.0, 74.8, 72.8, 72.7, 70.2, 70.1, 67.7, 67.6, 66.9, 65.4, 61.6, 61.4, 41.3, 20.59, 20.54, 20.4, 20.1, and 20.0 ppm. IR (KBr): νmax 3473.73, 2958.25, 1755.58, 1434.9 cm−1. HRMS: m/z = C58H69Cl3N9O30+; calculated = 1476.3211; found = 1476.3215 (M + H)+.

2.10. Synthesis of the Azide-Functionalized Glucodendron (11)

Glycoconjugated dendron 10 (0.3 g, 0.203 mmol) was dissolved in DMF, then sodium azide (52 mg, 0.812 mmol, 4.0 equiv.) was administered in argon ambient, and the reaction was continuously stirred for 12 h at 70°C. The reaction mixture was evaporated under reduced pressure, and the obtained crude mass was extracted with ethyl acetate (2 × 20 mL), cleaned with brine solution (2 × 15 mL), and dried over anhydrous sodium sulphate. The organics were collected and concentrated; the resulting residue was loaded to column chromatography to furnish the targeted azide-functionalized dendritic wedge 11 in excellent yield. Yield (295 mg, 98%) Rf = 0.4 (55% ethyl acetate/n-hexane); 1H-NMR (500 MHz, CDCl3): δ 8.30 (s, 1H, triazolyl-H), 8.22 (s, 2H, triazolyl-H), 6.07 (d, J = 9.5 Hz, 2H, H1), 5.97 (d, J = 9.5 Hz, 1H, H1), 5.60–5.53 (m, 3H, H3), 5.46–5.30 (m, 11H, H3, –CH2Ar), 4.53–4.47 (m, 2H, H2), 4.29–4.26 (m, 3H, H2, H4), 4.16–4.09 (m, 7H, H4, H5, H6), 2.077–2.074 (m, 9H, 3 × −COCH3), 2.03–2.02 (m, 12H, 4 × −COCH3), 1.95 (s, 6H, 2 × −COCH3), 1.86 (s, 3H, −COCH3), 1.83 (s, 6H, 2 × −COCH3); 13C-NMR (125 MHz, CDCl3): δ 170.5, 170.4, 170.0, 169.9, 169.5, 169.4, 168.9, 168.7, 146.97, 146.93, 143.9, 143.4, 128.1, 126.3, 122.8, 122.7, 85.6, 85.5, 75.0, 74.8, 72.9, 72.7, 70.2, 70.1, 67.7, 67.5, 66.9, 65.4, 61.6, 61.4, 49.6, 20.6, 20.56, 20.50, 20.14, and 20.11 ppm. IR (KBr): νmax 3448.33, 2966.6, 2104.96, 1755.21, 1647.97 cm−1. HRMS: m/z = C58H69Cl2N12O30+; calculated = 1483.3615; found = 1483.3607 (M + H)+.

2.11. Synthetic Procedure for Chlorine-Containing 36-Glucose-Coated Glycodendrimer (12)

Glycoconjugate dendron 11 (229 mg, 154 µmol, 15.0 equiv.) was grafted over hypercore 37 (20 mg, 10.2 µmol) using catalyst 9 (5 mg, 0.24 equiv.) according to the general procedure for the Cu(I)-catalyzed click reaction as described earlier to generate glycodendrimer 12 in moderate yield. Yield (53%); Rf = 0.50 (10% MeOH/CH2Cl2); 1H-NMR (500 MHz, CDCl3): δ = 8.39–8.21 (m, 40H, triazolyl-H), 8.02–8.00 (8H, triazolyl-H), 6.12–5.97 (m, 24H), 5.66–5.57 (m, 36H), 5.42–5.29 (m, 84H), 5.09 (d, J = 4.0 Hz, 24H), 4.89–4.71 (m, 84H), 4.29–4.10 (m, 72H), 3.89–3.82 (m, 48H), 3.57 (s, 8H), 2.63 (s, 16H, −COCH3), 2.08–1.97 (m, 216H, −COCH3), 1.91–1.86 (m, 216H, −COCH3); 13C-NMR (125 MHz, CDCl3): δ = 170.5, 170.0, 169.6, 169.4, 168.9, 168.7, 147.3, 147.1, 146.9, 146.6, 146.4, 143.7, 143.2, 139.1, 137.0, 128.2, 127.2, 127.1, 127.0, 126.5, 126.4, 124.7, 123.4, 123.2, 123.0, 122.8, 114.0, 103.7, 85.6, 75.0, 74.8, 72.9, 72.7, 70.1, 67.7, 67.6, 66.8, 65.9, 65.0, 61.6, 61.3, 61.2, 60.9, 50.3, 49.5, 48.4, 20.6, 20.5, and 20.1 ppm. IR (KBr): νmax 3444.07, 2924.30, 2853.33, 1754.51, 1638.87 cm−1.

3. Results and Discussion

To emphasize the importance of multivalent properties for carbohydrate-lectin interaction, we have designed and developed the cyclen-cored 36-glucose-coated (G1 generation) glycodendrimer using regioselective triazole-forming CuAAC reaction. An aromatic ‘aglycone,’ i.e., tris propargyloxy benzoate, was taken as the AB3 monomer for the construction of the dendritic wedge of choice of interest. To build the G1-generation cyclen-based glucose-coated dendrimer, a recent double-stage convergent way was embraced which encapsulates both paths, convergent and divergent [43]. Thus, our synthesis of the desired hypercore started with the commercially available gallic acid 1. It was esterified by using H2SO4 in methanol to form scaffold 2, followed by propargylation, which led to the formation of compound 3. Subsequently, compound 3 on treatment with lithium aluminum hydride (LAH) in anhydrous THF yielded the corresponding alcohol functionality 4 (Scheme 1). As reported in the literature, chlorine-containing motifs have a family of compounds of promising potential in the medicinal field. Thus, this research encouraged us to develop a novel chlorine-containing glycodendrimer with increased biological importance in the field of pharmaceuticals [44]. Moreover, scaffold 4 was treated with sulfuryl chloride (SO2Cl2) to furnish AB3 monomer 5 (Scheme 1). After the complete elucidation of the developed AB3 monomer 5, it reacted with cyclen azamacrocycle 6 to construct core 7 (Scheme 1). The obtained hypercore 7 was characterized by its spectral studies.

On the contrary, clickable 2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl azide 8 was synthesized from the corresponding D-glucose. For this, D-glucose was acetylated using acetic anhydride in the presence of iodine as a catalyst followed by treatment with HBr (33%) in acetic acid [45]. Then, the addition of NaN3 in DMF leads to the formation of azido sugar [16]. After chromatographic refining, the developed azido derivative was well characterized by NMR in the available experimental literature. Once the synthesis of the end groups “2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl azide” and AB3 monomer was accomplished, we next focused towards the regioselective CuAAC click conjugation of azido-appended end group 8 with alkynylated monomer 5. Therefore, we have optimized the dendron synthesis using different catalytic conditions, i.e., entries 1–4, as depicted in Table 1, in which, first of all, azide 8 was clicked with AB3 monomer 5 under CuSO4.5H2O/NaAsc in THF/H2O (1 : 1), reaction was completed in 12 h at room temperature, and the reaction yield was 80% (Table 1, entry 1). However, when the reaction was performed by using the stable catalyst dinuclear Cu(I) catalyst [(PPh3)2Cu(μ-tda)Cu(PPh3)2].6H2O (tda = thiodiacetate anion) 9 [36], the reaction was completed in 3 h, and yield was found to be 84% (Table 1, entry 4). In this way, the best catalyst, i.e., catalyst 9, displayed remarkable catalytic advantage in terms of stability, high yield, ligand-free, base-free, and short reaction time for the CuAAC reaction. Therefore, the optimized catalyst 9 was implemented for the development of chlorine-functionalized dendritic wedge 10 along with glycodendrimer 12.


EntryCatalytic conditionTemp (˚C)Yielda (%)Time (h)

1CuSO4.5H2O/NaAsc, THF/H2O (1 : 1)558012
2CuSO4.5H2O/NaAsc, DCM/H2O (1 : 1)rt7512
3CuI/DIPEA, DCMbrt7212
4[(PPh3)2Cu(μ-tda)Cu(PPh3)2].6H2O (9), DCMb/DIPEArt843

aYield reported after column chromatography (SiO2). bReaction under the anhydrous condition.

In order to achieve the first-generation glucodendron, i.e., chlorine-functionalized dendritic wedge 10, AB3 monomer 5 was coupled with 2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl azide 8 by means of catalyst 9 in anhydrous DCM. Moreover, dendritic unit 10 was altered into its required azide-functionalized dendritic moiety 11. Furthermore, this transformation (from chloro to azido) was confirmed by its IR spectra (∼2104.96 cm−1) (Figure 2), whereas in 13C-NMR, the downfield shifting was noticed during conversion from -CH2Cl (δ 41.3 ppm) to -CH2N3 (δ49.6 ppm) for scaffold 11, which clearly indicated the unambiguous formation of azide-functionalized dendron 11 (Figure 3).

Finally, azide-functionalized glucodendron 11 was amalgamated with hypercore 7 using dinuclear copper(I) thiodiacetate catalyst 9 in anhydrous DCM to afford 36-glucose-coated glycodendrimer 12 in moderate yield (Figure 1). For instance, the reaction was completed on TLC, while after column chromatography, only 53% yield was achieved. Furthermore, the synthesized glycodendrimer was well characterized by its spectroscopic studies. In IR spectra, there was no vibrating band of azide and alkyne which indicated the complete absence of free alkyne and azide functionality in the constructed glycodendrimers (Figure 2). Furthermore, the developed glycodendrimer was well characterized and studied by its comparative 1H-NMR and 13C-NMR (Figures 3 and 4).

In the 1H-NMR spectra of compound 12, the disappearance of acetylenic-H peak at 2.5 ppm of the core and the appearance of triazolyl peaks at 8.39–8.00 clearly depict the formation of the desired glycodendrimer, whereas the peak pattern of the dendron and core can also be seen in the spectra of Figure 3, which substantiate the generation of glycodendrimer 12.

Apart from this, the disappearance of acetylenic carbon peaks at 78.2, 78.1, 76.3, and 76.2 ppm of the core and the appearance of the triazolyl carbon peak in the glycodendrimer 12 NMR support its formation, while the cyclen (-CH2) peak of the core at 50.3 ppm can also be seen in 13C-NMR of compound 12, which established the formation of glycodendrimer 12 (Figure 4).

The low polydispersity index (PDI = 1.11) obtained through gel permeation chromatography (GPC) has displayed the thorough molecular structure of the glycodendrimer (Figure 5). We also evaluated the retention time (14.41 min) for glycodendrimer 12.

4. Conclusion

The work presented here involved the synthesis of glycodendrimer of high-glucose tethers with low generation using the copper catalyst. In this regard, a hypercore having 12-alkynyl functionality derived from the cyclen unit was constructed. Thereafter, glucodendrons were grafted over the hypercore to generate a giant chlorine-containing 36-peripheral glucosylated glycodendrimer of G1 generation. Furthermore, the constructed glycodendrimers were well characterized by their NMR, HRMS, and IR spectral data. Moreover, the size-exclusion chromatogram has displayed the high monodispersity of the achieved glycodendrimer.

Data Availability

The data used to support the findings of this study are available from the corresponding author upon request.

Conflicts of Interest

The authors declare no conflicts of interest.

Authors’ Contributions

AKA synthesized and performed the most of the writing part and prepared the original draft. SK performed the synthesis of starting material. AS performed data analysis. VKT performed data analysis, supervised and analyzed the study, and reviewed and edited the article.

Acknowledgments

The authors gratefully acknowledge the Council of Scientific and Industrial Research (CSIR), New Delhi (Scheme no. 02(0345)/19/EMR-II), and IoE, Banaras Hindu University (BHU), for the funding. The authors also thank Prof. S. Bhattacharya for his support in the preparation of the catalyst. AKA sincerely acknowledges CSIR, New Delhi, for the Senior Research Fellowship (SRF). The authors sincerely thank CISC-Department of Chemistry, BHU, Varanasi, for providing spectroscopic studies of the developed molecules.

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