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Nguyen KT, Huynh TNT, Ratanathawornkiti K, Juthathan M, Thamyongkit P, Sukwattanasinitt M, Wacharasindhu S. NaI-Mediated Electrochemical Cyclization-Desulfurization for the Synthesis of N-Substituted 2-Aminobenzimidazoles. J Org Chem 2024; 89:1591-1608. [PMID: 38102091 DOI: 10.1021/acs.joc.3c02212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2023]
Abstract
An electrochemical method for the synthesis of N-substituted 2-aminobenzimidazoles through a NaI-mediated desulfurization-cyclization process is reported. This electrosynthesis method utilizes cost-effective NaI as both a mediator and an electrolyte in a catalytic amount (0.2 equiv), replacing traditional oxidizing reagents. N-Substituted o-phenylenediamines and isothiocyanates undergo a thiourea formation/cyclization/desulfurization process to provide N-substituted 2-aminobenzimidazoles (55 examples, up to 98% yield) in a single reaction vessel. Importantly, this electrochemical methodology is applicable to gram-scale synthesis, maintaining reaction efficiency.
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Affiliation(s)
- Khuyen Thu Nguyen
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Thao Nguyen Thanh Huynh
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | | | - Methasit Juthathan
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Patchanita Thamyongkit
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | | | - Sumrit Wacharasindhu
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
- Green Chemistry for Fine Chemical Productions and Environmental Remediation Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
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Wahyuni DK, Yoku BF, Mukarromah SR, Purnama PR, Ilham M, Rakashiwi GA, Indriati DT, Junairiah, Wacharasindhu S, Prasongsuk S, Subramaniam S, Purnobasuki H. Unraveling the secrets of Eclipta alba (L.) Hassk.: a comprehensive study of morpho-anatomy and DNA barcoding. BRAZ J BIOL 2023; 83:e274315. [PMID: 38126630 DOI: 10.1590/1519-6984.274315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Accepted: 07/21/2023] [Indexed: 12/23/2023] Open
Abstract
Safety regarding herbal products is very necessary; therefore, routine identification of raw materials should be performed to ensure that the raw materials used in pharmaceutical products are suitable for their intended use. In order for the identification-related data obtained to be accurate, the identification of various kinds of markers is also very necessary. The purpose of this study was to describe the characteristics of Eclipta alba (L.) Hassk. based on qualitative morpho-anatomical markers and quantitative DNA coding. The morphology of this plant has herbaceous habit with a taproot and a stem with branches that appear from the middle. Leaves are single type imperfectly arranged oppositely, lanceolatus, finely serrated on the edges, tapered at the base, pointed at the end, and have a pinnate and hairy leaf surface. The flowers consist of ray flowers and tube flowers with a cup shape. Meanwhile, in terms of anatomy, E. alba has aerenchyma, which are scattered in the cortex of the root and stem. In addition, there are anisocytic stomata, glandular trichomes, and non-glandural trichomes with an elongated shape accompanied by ornamentation found on the leaf epidermis. The results of sequence alignment and phylogenetic tree reconstruction show that the sample plants are closely related to species in the genus Eclipta.
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Affiliation(s)
- D K Wahyuni
- Universitas Airlangga, Faculty of Science and Technology, Department of Biology, Surabaya, East Java, Indonesia
| | - B F Yoku
- Universitas Airlangga, Faculty of Science and Technology, Department of Biology, Surabaya, East Java, Indonesia
| | - S R Mukarromah
- Universitas Airlangga, Faculty of Science and Technology, Department of Biology, Surabaya, East Java, Indonesia
| | - P R Purnama
- Universitas Airlangga, Faculty of Science and Technology, Department of Biology, Surabaya, East Java, Indonesia
- Chulalongkorn University, Faculty of Science, Graduate Program in Bioinformatics and Computational Biology, Wangmai, Bangkok, Thailand
| | - M Ilham
- Universitas Airlangga, Faculty of Science and Technology, Department of Biology, Surabaya, East Java, Indonesia
| | - G A Rakashiwi
- Universitas Airlangga, Faculty of Science and Technology, Department of Biology, Surabaya, East Java, Indonesia
| | - D T Indriati
- Universitas Airlangga, Faculty of Science and Technology, Department of Biology, Surabaya, East Java, Indonesia
| | - Junairiah
- Universitas Airlangga, Faculty of Science and Technology, Department of Biology, Surabaya, East Java, Indonesia
| | - S Wacharasindhu
- Universitas Airlangga, Faculty of Science and Technology, Department of Biology, Surabaya, East Java, Indonesia
- Chulalongkorn University, Faculty of Science, Department of Chemistry, Wangmai, Bangkok, Thailand
| | - S Prasongsuk
- Chulalongkorn University, Department of Botany, Faculty of Science, Wangmai, Bangkok, Thailand
| | - S Subramaniam
- Universitas Airlangga, Faculty of Science and Technology, Department of Biology, Surabaya, East Java, Indonesia
- Universiti Sains Malaysia, School of Biological Science, Georgetown, Penang, Malaysia
| | - H Purnobasuki
- Universitas Airlangga, Faculty of Science and Technology, Department of Biology, Surabaya, East Java, Indonesia
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Huynh TNT, Nguyen KT, Sukwattanasinitt M, Wacharasindhu S. Electrochemical NaI-mediated one-pot synthesis of guanidines from isothiocyanates via tandem addition-guanylation. Org Biomol Chem 2023; 21:8667-8674. [PMID: 37672208 DOI: 10.1039/d3ob01113e] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/07/2023]
Abstract
In this study, we present an electrochemical approach for the synthesis of guanidines from isothiocyanates and amines in a single reaction vessel. This one-pot operation takes place in aqueous media, utilizing an undivided cell setup with NaI serving as both the electrolyte and mediator. The process involves the in situ generation of thiourea, followed by electrolytic guanylation with amines. Under ambient temperature conditions, we successfully demonstrated the formation of 30 different guanidine compounds, achieving yields ranging from fair to excellent. Furthermore, the synthesis method could be carried out on a gram scale with a good yield. This protocol stands out for its cost-effectiveness, step-economical design, high tolerance towards various functional groups, and environmentally friendly reaction conditions.
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Affiliation(s)
- Thao Nguyen Thanh Huynh
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand 10330.
| | - Khuyen Thu Nguyen
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand 10330.
| | | | - Sumrit Wacharasindhu
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand 10330.
- Green Chemistry for Fine Chemical Productions and Environmental Remediation Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand 10330
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Wahyuni DK, Wacharasindhu S, Bankeeree W, Wahyuningsih SPA, Ekasari W, Purnobasuki H, Punnapayak H, Prasongsuk S. In vitro and in vivo antiplasmodial activities of leaf extracts from Sonchus arvensis L. BMC Complement Med Ther 2023; 23:47. [PMID: 36788545 PMCID: PMC9926696 DOI: 10.1186/s12906-023-03871-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Accepted: 02/02/2023] [Indexed: 02/16/2023] Open
Abstract
BACKGROUND Malaria continues to be a global problem due to the limited efficacy of current drugs and the natural products are a potential source for discovering new antimalarial agents. Therefore, the aims of this study were to investigate phytochemical properties, cytotoxic effect, antioxidant, and antiplasmodial activities of Sonchus arvensis L. leaf extracts both in vitro and in vivo. METHODS The extracts from S. arvensis L. leaf were prepared by successive maceration with n-hexane, ethyl acetate, and ethanol, and then subjected to quantitative phytochemical analysis using standard methods. The antimalarial activities of crude extracts were tested in vitro against Plasmodium falciparum 3D7 strain while the Peter's 4-day suppressive test model with P. berghei-infected mice was used to evaluate the in vivo antiplasmodial, hepatoprotective, nephroprotective, and immunomodulatory activities. The cytotoxic tests were also carried out using human hepatic cell lines in [3(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] (MTT) assay. RESULT The n-hexane, ethyl acetate, and ethanolic extracts of S. arvensis L. leaf exhibited good in vitro antiplasmodial activity with IC50 values 5.119 ± 3.27, 2.916 ± 2.34, and 8.026 ± 1.23 μg/mL, respectively. Each of the extracts also exhibited high antioxidant with low cytotoxic effects. Furthermore, the ethyl acetate extract showed in vivo antiplasmodial activity with ED50 = 46.31 ± 9.36 mg/kg body weight, as well as hepatoprotective, nephroprotective, and immunomodulatory activities in mice infected with P. berghei. CONCLUSION This study highlights the antiplasmodial activities of S. arvensis L. leaf ethyl acetate extract against P. falciparum and P. berghei as well as the antioxidant, nephroprotective, hepatoprotective, and immunomodulatory activities with low toxicity. These results indicate the potential of Sonchus arvensis L. to be developed into a new antimalarial drug candidate. However, the compounds and transmission-blocking strategies for malaria control of S. arvensis L. extracts are essential for further study.
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Affiliation(s)
- Dwi Kusuma Wahyuni
- Plant Biomass Utilization Research Unit, Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand. .,Department of Biology, Faculty of Science and Technology, Universitas Airlangga Surabaya, East Java, 60115, Indonesia.
| | - Sumrit Wacharasindhu
- grid.7922.e0000 0001 0244 7875Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330 Thailand
| | - Wichanee Bankeeree
- grid.7922.e0000 0001 0244 7875Plant Biomass Utilization Research Unit, Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok, 10330 Thailand
| | - Sri Puji Astuti Wahyuningsih
- grid.440745.60000 0001 0152 762XDepartment of Biology, Faculty of Science and Technology, Universitas Airlangga Surabaya, East Java, 60115 Indonesia
| | - Wiwied Ekasari
- grid.440745.60000 0001 0152 762XDepartment of Pharmaceutical Sciences, Faculty of Pharmacy, Universitas Airlangga, Surabaya, East Java 60115 Indonesia
| | - Hery Purnobasuki
- grid.440745.60000 0001 0152 762XDepartment of Biology, Faculty of Science and Technology, Universitas Airlangga Surabaya, East Java, 60115 Indonesia
| | - Hunsa Punnapayak
- grid.7922.e0000 0001 0244 7875Plant Biomass Utilization Research Unit, Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok, 10330 Thailand
| | - Sehanat Prasongsuk
- Plant Biomass Utilization Research Unit, Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand. .,Department of Biology, Faculty of Science and Technology, Universitas Airlangga Surabaya, East Java, 60115, Indonesia.
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Wahyuni DK, Wacharasindhu S, Bankeeree W, Punnapayak H, Prasongsuk S. In silico anti-SARS-CoV-2, antiplasmodial, antioxidant, and antimicrobial activities of crude extracts and homopterocarpin from heartwood of Pterocarpus macrocarpus Kurz. Heliyon 2023; 9:e13644. [PMID: 36789389 PMCID: PMC9912040 DOI: 10.1016/j.heliyon.2023.e13644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 01/27/2023] [Accepted: 02/06/2023] [Indexed: 02/12/2023] Open
Abstract
Natural products play an essential role in new drug discovery. In the present study, we determined the anti-SARS-CoV-2 (severe acute respiratory syndrome-related coronavirus-2), antioxidant, antiplasmodial, and antimicrobial activities of Pterocarpus macrocarpus Kurz. heartwood and structurally characterized the bioactive compounds. P. macrocarpus Kurz. heartwood was macerated with n-hexane, ethyl acetate, and ethanol, respectively, for 7 days, three times. The compounds were isolated by recrystallization with n-hexane and evaluated by thin-layer chromatography (TLC), gas chromatography-mass spectrophotometry (GC-MS), Fourier transform infrared spectroscopy (FITR), and nuclear magnetic resonance (NMR) spectroscopy. Ethyl acetate, ethanol, n-hexane extracts, and homopterocarpin exhibited antiplasmodial activity at 1.78, 2.21, 7.11, and 0.52 μg/ml, respectively, against P. falciparum 3D7 with low toxicity (selectivity index/SI ≥ 28.46). GC-MS identified compound showed in silico anti-SARS-CoV-2 binding affinity with stigmasterol and SARS-CoV-2 helicase of -8.2 kcal/mol. Ethyl acetate extract exhibited the best antioxidant activity against DPPH (0.76 ± 0.92 μg/ml) and ABTS (0.61 ± 0.46 μg/ml). They also demonstrated antimicrobial activity against B. subtilis, ethanol and ethyl acetate extracts against E. coli and C. albicans, and ethanol extract against S. aureus with diameter zone of inhibition of more than 1 cm. The results highlighted antiplasmodial activity of extracts and homopterocarpin from P. macrocarpus Kurz. heartwood and its potent binding in silico to anti-SARS-CoV-2 proteins with low toxicity. This study also confirmed that extracts exhibited antioxidant and antimicrobial activities. Further studies are needed to assess the safety and clinical trial of P. macrocarpus Kurz. for development as new drug candidate.
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Affiliation(s)
- Dwi Kusuma Wahyuni
- Plant Biomass Utilization Research Unit, Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok, 10330 Thailand
- Department of Biology, Faculty of Science and Technology, Universitas Airlangga, Surabaya, East Java, 60115, Indonesia
| | - Sumrit Wacharasindhu
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Wichanee Bankeeree
- Plant Biomass Utilization Research Unit, Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok, 10330 Thailand
| | - Hunsa Punnapayak
- Plant Biomass Utilization Research Unit, Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok, 10330 Thailand
| | - Sehanat Prasongsuk
- Plant Biomass Utilization Research Unit, Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok, 10330 Thailand
- Department of Biology, Faculty of Science and Technology, Universitas Airlangga, Surabaya, East Java, 60115, Indonesia
- Corresponding author. Plant Biomass Utilization Research Unit, Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok, 10330 Thailand
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Wahyuni DK, Wacharasindhu S, Bankeeree W, Punnapayak H, Purnobasuki H, Junairiah J, Ansori ANM, Kharisma VD, Parikesit AA, Suhargo L, Prasongsuk S. Molecular simulation of compounds from n-hexane fraction of Sonchus arvensis L. leaves as SARS-CoV-2 antiviral through inhibitor activity targeting strategic viral protein. J Pharm Pharmacogn Res 2022. [DOI: 10.56499/jppres22.1489_10.6.1126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
Context: COVID-19 was caused by the spread and transmission of SARS-CoV-2 at the end of 2019 until now. The problem comes when antiviral drugs have not yet been found and patients infected with SARS-CoV-2 can trigger a cytokine storm condition due to the effects of viral replication. Indonesia has various kinds of medicinal plants, such as Sonchus arvensis L., which are used as medicinal plants. Aims: To analyze the activity of the inhibitor as SARS-CoV-2 antiviral agents from n-hexane fractions of S. arvensis leaves. Methods: The sample was collected from GC-MS analysis, PubChem, and Protein Databank database, then drug-likeness identification using Lipinski Rule of Five server and bioactive prediction of bioactive compounds as inhibitor activity was conducted by Molinspiration server. Furthermore, the docking simulation was performed using PyRx 0.9.9 software to determine the binding activity, molecular interaction by Discovery Studio software to identify position and interaction type, 3D molecular visualization by PyMol 2.5. software, and dynamic by CABS-flex 2.0 server to predict interaction stability. Results: α-Amyrin and β-amyrin from n-hexane fractions of S. arvensis leaves had activity as SARS-CoV-2 inhibitors through interactions on helicase, RdRp, Mpro, and RBD-Spike, both compounds had more negative binding affinity than control drug and can produce stable chemical bond interactions in the ligand-protein complexes. However, the results were merely computational, so they must be validated through an in vivo and in vitro research approach. Conclusions: Sonchus arvensis L. leaves were predicted to have SARS-CoV-2 antiviral through inhibitor activity by α-amyrin and β-amyrin.
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Wacharasindhu S. Cluster Preface: Organic Chemistry in Thailand. Synlett 2022. [DOI: 10.1055/s-0041-1738688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Abstract
AbstractThis SYNLETT cluster highlights research work conducted in universities across Thailand. As a country rich in biodiversity, chemical research in Thailand was originally founded on the study of natural products. The discovery and development of novel, biologically active agents has contributed to drug discovery and advanced the development of novel compounds.1 Since the 1990s, the growth of petrochemical industries in Southeast Asia has spurred chemical research on synthetic methodologies, the creation of high-value compounds from petroleum-based starting materials and polymer sciences. The results have led to significant economic and strategic advantages that have enabled the competitiveness of local petrochemical industries. Moving into the new era, Thailand and the region faces global sustainability challenges. Green chemistry has also become a key theme for driving chemical research, which is expected to help in generating new ideas and innovations to deliver a more sustainable society. This cluster contains 27 articles that have been submitted from 12 different Thai universities. The articles are organized into 3 main themes, as outlined below.
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Chaibuth P, Chuaytanee N, Hojitsiriyanont J, Chainok K, Wacharasindhu S, Reiser O, Sukwattanasinitt M. Copper( ii) complexes of quinoline-based ligands for efficient photoredox catalysis of atom transfer radical addition (ATRA) reaction. NEW J CHEM 2022. [DOI: 10.1039/d2nj01218a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Cu(ii)·1Q is efficient in ATRA reactions with perhaloalkanes, revealing the role of common additives (AIBN or inorganic base).
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Affiliation(s)
- Pawittra Chaibuth
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
- Institut für Organische Chemie Universität Regensburg, Universitätsstr. 31, 93053 Regensburg, Germany
| | - Nontakarn Chuaytanee
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Jutawat Hojitsiriyanont
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Kittipong Chainok
- Materials and Textiles Technology, Faculty of Science and Technology, Thammasat University, Klong Luang, Pathum Thani 12120, Thailand
| | - Sumrit Wacharasindhu
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Oliver Reiser
- Institut für Organische Chemie Universität Regensburg, Universitätsstr. 31, 93053 Regensburg, Germany
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Rerkrachaneekorn T, Tankam T, Sukwattanasinitt M, Wacharasindhu S. NaI-mediated oxidative amidation of benzyl alcohols/aromatic aldehydes to benzamides via electrochemical reaction. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
In this work, we developed the catalytic guanylation of thiourea using Ru(bpy)3Cl2 as a photocatalyst under irradiation by visible light. The conversion of various thioureas to the corresponding guanidines was achieved using 1-5 mol % of photocatalyst in a mixture of water and ethanol at room temperature. Key benefits of this reaction include the use of photoredox catalyst, low-toxicity solvents/base, ambient temperature, and an open-flask environment.
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Affiliation(s)
- Trin Saetan
- Nanotec-CU Center of Excellence on Food and Agriculture, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Mongkol Sukwattanasinitt
- Nanotec-CU Center of Excellence on Food and Agriculture, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Sumrit Wacharasindhu
- Nanotec-CU Center of Excellence on Food and Agriculture, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.,Green Chemistry for Fine Chemical Productions STAR, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok10330, Thailand
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11
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Thaveesangsakulthai I, Wacharasindhu S, Vchirawongkwin V, Nhujak T, Chailapakul O, Kulsing C. Development of Electrocoagulation and Detection Approaches for Manipulation of Volatile Compound Profiles in Organic Medium Supported Using Two‐Phase Electrolyte System. ChemistrySelect 2020. [DOI: 10.1002/slct.202002221] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
| | - Sumrit Wacharasindhu
- Department of Chemistry Faculty of Science Chulalongkorn University Bangkok 10330 Thailand
| | - Viwat Vchirawongkwin
- Department of Chemistry Faculty of Science Chulalongkorn University Bangkok 10330 Thailand
| | - Thumnoon Nhujak
- Department of Chemistry Faculty of Science Chulalongkorn University Bangkok 10330 Thailand
- Chromatographic Separation and Flavor Chemistry Research Unit and Center of Molecular Sensory Science Department of Chemistry Faculty of Science Chulalongkorn University Bangkok 10330 Thailand
| | - Orawon Chailapakul
- Department of Chemistry Faculty of Science Chulalongkorn University Bangkok 10330 Thailand
- Electrochemistry and Optical Spectroscopy Center of Excellence (EOSCE) Department of Chemistry Faculty of Science Chulalongkorn University 254 Phayathai Road, Pathumwan Bangkok 10330 Thailand
| | - Chadin Kulsing
- Department of Chemistry Faculty of Science Chulalongkorn University Bangkok 10330 Thailand
- Chromatographic Separation and Flavor Chemistry Research Unit and Center of Molecular Sensory Science Department of Chemistry Faculty of Science Chulalongkorn University Bangkok 10330 Thailand
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12
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Khanantong C, Charoenthai N, Wacharasindhu S, Sukwattanasinitt M, Yimkaew W, Traiphol N, Traiphol R. Achieving reversible thermochromism of bisdiynamide polydiacetylene via self-assembling in selected solvents. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.125225] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Srisa J, Tankam T, Sukwattanasinitt M, Wacharasindhu S. Micelle-Enabled One-Pot Guanidine Synthesis in Water Directly from Isothiocyanate using Hypervalent Iodine(III) Reagents under Mild Conditions. Chem Asian J 2019; 14:3335-3343. [PMID: 31397526 DOI: 10.1002/asia.201900982] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Indexed: 02/06/2023]
Abstract
In this work, we developed a one-pot synthesis of guanidine directly from isothiocyanate using DIB (diacetoxyiodobenzene) as a desulfurizing agent under micellar conditions in water. Our optimization study revealed that the use of 1 % TPGS-750-M as a surfactant with NaOH as an additive base at room temperature can convert a variety of isothiocyanates and amines into corresponding guanidines in excellent yields (69-95 %). This synthetic process in water can be applied to prepare guanidine at gram-scale quantity. Our aqueous micellar medium also demonstrated high reusability as the reaction can be performed for several cycles without losing its efficiency. The reaction is metal-free, utilizes water as solvent and practical (room temperature and open flask).
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Affiliation(s)
- Jakkrit Srisa
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand.,Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, Bangkok, Thailand
| | - Theeranon Tankam
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Mongkol Sukwattanasinitt
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand.,Nanotec-CU Center of Excellence on Food and Agriculture, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Sumrit Wacharasindhu
- Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, Bangkok, Thailand.,Nanotec-CU Center of Excellence on Food and Agriculture, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand
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Thavornsin N, Chamrasboon P, Kiatmongkolkul P, Sakthanasait R, Sukwattanasinitt M, Wacharasindhu S. Synthesis of highly pure poly(aryleneethnylene)s using palladium supported on calcium carbonate as an eco‐friendly heterogeneous catalyst. ACTA ACUST UNITED AC 2019. [DOI: 10.1002/pola.29419] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Nopparat Thavornsin
- Department of Chemistry, Faculty of ScienceChulalongkorn University Bangkok 10330 Thailand
- Center of Excellence on Petrochemical and Materials TechnologyChulalongkorn University Bangkok Thailand
| | - Pitchaporn Chamrasboon
- Department of Chemistry, Faculty of ScienceChulalongkorn University Bangkok 10330 Thailand
| | | | - Ryo Sakthanasait
- Department of Chemistry, Faculty of ScienceChulalongkorn University Bangkok 10330 Thailand
| | - Mongkol Sukwattanasinitt
- Nanotec‐CU Center of Excellence on Food and Agriculture, Department of Chemistry, Faculty of ScienceChulalongkorn University Bangkok 10330 Thailand
| | - Sumrit Wacharasindhu
- Center of Excellence on Petrochemical and Materials TechnologyChulalongkorn University Bangkok Thailand
- Nanotec‐CU Center of Excellence on Food and Agriculture, Department of Chemistry, Faculty of ScienceChulalongkorn University Bangkok 10330 Thailand
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15
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Tankam T, Srisa J, Sukwattanasinitt M, Wacharasindhu S. Microwave-Enhanced On-Water Amination of 2-Mercaptobenzoxazoles To Prepare 2-Aminobenzoxazoles. J Org Chem 2018; 83:11936-11943. [DOI: 10.1021/acs.joc.8b01824] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Theeranon Tankam
- Nanotec-CU Center of Excellence on Food and Agriculture, Department of Chemistry, Faculty of Science, Chulalongkorn University Bangkok 10330, Thailand
| | - Jakkrit Srisa
- Nanotec-CU Center of Excellence on Food and Agriculture, Department of Chemistry, Faculty of Science, Chulalongkorn University Bangkok 10330, Thailand
| | - Mongkol Sukwattanasinitt
- Nanotec-CU Center of Excellence on Food and Agriculture, Department of Chemistry, Faculty of Science, Chulalongkorn University Bangkok 10330, Thailand
| | - Sumrit Wacharasindhu
- Nanotec-CU Center of Excellence on Food and Agriculture, Department of Chemistry, Faculty of Science, Chulalongkorn University Bangkok 10330, Thailand
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Worawalai W, Sompornpisut P, Wacharasindhu S, Phuwapraisirisan P. Quercitol: From a Taxonomic Marker of the Genus Quercus to a Versatile Chiral Building Block of Antidiabetic Agents. J Agric Food Chem 2018; 66:5741-5745. [PMID: 29793339 DOI: 10.1021/acs.jafc.8b01584] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Quercitol is a cyclohexanepentol that has been recognized as a biomarker of plants in genus Quercus, which includes oak. As a result of its glucose-like structure, it has been introduced as an alternative chiral building block in the synthesis of several bioactive compounds. Our continuing investigations on the synthesis of antidiabetic agents from quercitol have demonstrated that this chiral synthon can generate diverse structural features with improved hypoglycemic activity.
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Thavornsin N, Rashatasakhon P, Sukwattanasinitt M, Wacharasindhu S. Salicylaldimine-functionalized poly(m
-phenyleneethynylene) as turn-on chemosensor for ferric ion. ACTA ACUST UNITED AC 2018. [DOI: 10.1002/pola.28997] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Nopparat Thavornsin
- Program of Petrochemistry and Polymer Science, Faculty of Science; Chulalongkorn University; Bangkok 10330 Thailand
| | - Paitoon Rashatasakhon
- Department of Chemistry, Faculty of Science, Nanotec-CU Center of Excellence on Food and Agriculture; Chulalongkorn University; Bangkok 10330 Thailand
| | - Mongkol Sukwattanasinitt
- Department of Chemistry, Faculty of Science, Nanotec-CU Center of Excellence on Food and Agriculture; Chulalongkorn University; Bangkok 10330 Thailand
| | - Sumrit Wacharasindhu
- Department of Chemistry, Faculty of Science, Nanotec-CU Center of Excellence on Food and Agriculture; Chulalongkorn University; Bangkok 10330 Thailand
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18
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Rattanangkool E, Sukwattanasinitt M, Wacharasindhu S. Organocatalytic Visible Light Enabled SNAr of Heterocyclic Thiols: A Metal-Free Approach to 2-Aminobenzoxazoles and 4-Aminoquinazolines. J Org Chem 2017; 82:13256-13262. [DOI: 10.1021/acs.joc.7b02357] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Eakkaphon Rattanangkool
- Nanotec-CU Center of Excellence on
Food and Agriculture, Department of Chemistry, Faculty of Science, Chulalongkorn University Bangkok 10330, Thailand
| | - Mongkol Sukwattanasinitt
- Nanotec-CU Center of Excellence on
Food and Agriculture, Department of Chemistry, Faculty of Science, Chulalongkorn University Bangkok 10330, Thailand
| | - Sumrit Wacharasindhu
- Nanotec-CU Center of Excellence on
Food and Agriculture, Department of Chemistry, Faculty of Science, Chulalongkorn University Bangkok 10330, Thailand
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Saetan T, Lertvachirapaiboon C, Ekgasit S, Sukwattanasinitt M, Wacharasindhu S. Palladium Nanoparticles Immobilized on Individual Calcium Carbonate Plates Derived from Mussel Shell Waste: An Ecofriendly Catalyst for the Copper-Free Sonogashira Coupling Reaction. Chem Asian J 2017; 12:2221-2230. [DOI: 10.1002/asia.201700537] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2017] [Revised: 05/09/2017] [Indexed: 11/12/2022]
Affiliation(s)
- Trin Saetan
- Nanotec-CU Center of Excellence on Food and Agriculture; Department of Chemistry, Faculty of Science; Chulalongkorn University; Bangkok 10330 Thailand
| | - Chutiparn Lertvachirapaiboon
- Graduate School of Science and Technology; Niigata University; 8050 Ikarashi 2-nocho Nishi-ku, Niigata 950-2181 JAPAN
| | - Sanong Ekgasit
- Department of Chemistry; Faculty of Science; Chulalongkorn University; Bangkok 10330 Thailand
| | - Mongkol Sukwattanasinitt
- Nanotec-CU Center of Excellence on Food and Agriculture; Department of Chemistry, Faculty of Science; Chulalongkorn University; Bangkok 10330 Thailand
| | - Sumrit Wacharasindhu
- Nanotec-CU Center of Excellence on Food and Agriculture; Department of Chemistry, Faculty of Science; Chulalongkorn University; Bangkok 10330 Thailand
- Green Chemistry for Fine Chemical Productions STAR, Department of Chemistry, Faculty of Science; Chulalongkorn University; Bangkok 10330
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20
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Sukato R, Sangpetch N, Palaga T, Jantra S, Vchirawongkwin V, Jongwohan C, Sukwattanasinitt M, Wacharasindhu S. New turn-on fluorescent and colorimetric probe for cyanide detection based on BODIPY-salicylaldehyde and its application in cell imaging. J Hazard Mater 2016; 314:277-285. [PMID: 27136733 DOI: 10.1016/j.jhazmat.2016.04.001] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Revised: 03/13/2016] [Accepted: 04/02/2016] [Indexed: 05/06/2023]
Abstract
Development of cyanide sensor is important as the anion is harmful to human health and the environment. Herein, a new colorimetric and fluorescent probe GSB based on boron dipyrrole-methene (BODIPY) containing salicylaldehyde group for cyanide detection has been reported. GSB undergoes exclusive colorimetric change from orange to colorless and exhibits selective fluorescence turn-on at 504nm upon the addition of cyanide. Other 13 anions give almost no interference under physiological condition. Detection limit of the new cyanide-sensing GSB is 0.88μM, which is below World Health Organization (WHO) recommended level in drinking water. A calculation by density functional theory (DFT) shows suppression of photoinduced electron transfer (PET) mechanism along with the interruption of π-conjugation between salicylaldehyde and BODIPY core by cyanide anion. Cell imaging studies demonstrated that GSB is compatible and capable of sensing cyanide anion in living cells.
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Affiliation(s)
- Rangsarit Sukato
- Program of Petrochemistry and Polymer Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Nuanphan Sangpetch
- Department of Microbiology, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand
| | - Tanapat Palaga
- Department of Microbiology, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand
| | - Suthikorn Jantra
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Viwat Vchirawongkwin
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Chanantida Jongwohan
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Mongkol Sukwattanasinitt
- Nanotec-CU Center of Excellence on Food and Agriculture, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Sumrit Wacharasindhu
- Nanotec-CU Center of Excellence on Food and Agriculture, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
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Rattanangkool E, Vilaivan T, Sukwattanasinitt M, Wacharasindhu S. An Atom-Economic Approach for Vinylation of Indoles and Phenols Using Calcium Carbide as Acetylene Surrogate. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600666] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Eakkaphon Rattanangkool
- Organic Synthesis Research Unit; Department of Chemistry; Faculty of Science; Chulalongkorn University; 10330 Bangkok Thailand
| | - Tirayut Vilaivan
- Organic Synthesis Research Unit; Department of Chemistry; Faculty of Science; Chulalongkorn University; 10330 Bangkok Thailand
| | - Mongkol Sukwattanasinitt
- Nanotec-CU Center of Excellence on Food and Agriculture; Department of Chemistry; Faculty of Science; Chulalongkorn University; 10330 Bangkok Thailand
| | - Sumrit Wacharasindhu
- Nanotec-CU Center of Excellence on Food and Agriculture; Department of Chemistry; Faculty of Science; Chulalongkorn University; 10330 Bangkok Thailand
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Worawalai W, Sompornpisut P, Wacharasindhu S, Phuwapraisirisan P. Voglibose-inspired synthesis of new potent α-glucosidase inhibitors N-1,3-dihydroxypropylaminocyclitols. Carbohydr Res 2016; 429:155-62. [DOI: 10.1016/j.carres.2016.04.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2016] [Revised: 04/08/2016] [Accepted: 04/09/2016] [Indexed: 11/28/2022]
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23
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Tankam T, Poochampa K, Vilaivan T, Sukwattanasinitt M, Wacharasindhu S. Organocatalytic visible light induced S–S bond formation for oxidative coupling of thiols to disulfides. Tetrahedron 2016. [DOI: 10.1016/j.tet.2015.12.036] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Worawalai W, Wacharasindhu S, Phuwapraisirisan P. N-Arylmethylaminoquercitols, a new series of effective antidiabetic agents having α-glucosidase inhibition and antioxidant activity. Bioorg Med Chem Lett 2015; 25:2570-3. [PMID: 25959812 DOI: 10.1016/j.bmcl.2015.04.033] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Revised: 04/07/2015] [Accepted: 04/11/2015] [Indexed: 11/19/2022]
Abstract
A new series of N-arylalkylaminoquercitols were synthesized by reductive amination of aminoquercitol bisacetonide 5 and a variety of aryl aldehydes. The targeted N-substituted aminoquercitols having phenolic moiety (7a-7c) displayed significantly enhanced α-glucosidase inhibition, which is 26-32 times more potent than that of the unmodified aminoquercitol 6. In addition, compounds 7a-7c also retained antioxidant activity with relatively more pronounced potency than their original phenolics. This recent finding suggests an approach to develop effective antidiabetic agents by incorporating antioxidative moiety into aminocyclitol core structure.
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Affiliation(s)
- Wisuttaya Worawalai
- Natural Products Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Sumrit Wacharasindhu
- Natural Products Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Preecha Phuwapraisirisan
- Natural Products Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
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25
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Worawalai W, Wacharasindhu S, Phuwapraisirisan P. Amine-linked diquercitols as new α-glucosidase inhibitors. Bioorg Med Chem Lett 2014; 24:5530-3. [DOI: 10.1016/j.bmcl.2014.09.064] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Revised: 09/08/2014] [Accepted: 09/24/2014] [Indexed: 10/24/2022]
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26
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Rattanangkool E, Krailat W, Vilaivan T, Phuwapraisirisan P, Sukwattanasinitt M, Wacharasindhu S. Hypervalent Iodine(III)-Promoted Metal-Free S-H Activation: An Approach for the Construction of S-S, S-N, and S-C Bonds. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402180] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Abstract
An efficient method for the preparation of poly(p-phenyleneethynylene)s (PPEs) from direct coupling reactions between aryl diiodides and inexpensive chemical feedstock calcium carbide is developed.
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Affiliation(s)
- Nopparat Thavornsin
- Program of Petrochemistry and Polymer Science
- Faculty of Science
- Chulalongkorn University
- Bangkok 10330
- Thailand
| | - Mongkol Sukwattanasinitt
- Nanotec-CU Center of Excellence on Food and Agriculture
- Department of Chemistry
- Faculty of Science
- Chulalongkorn University
- Bangkok 10330
| | - Sumrit Wacharasindhu
- Nanotec-CU Center of Excellence on Food and Agriculture
- Department of Chemistry
- Faculty of Science
- Chulalongkorn University
- Bangkok 10330
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Rattanangkool E, Kittikhunnatham P, Damsud T, Wacharasindhu S, Phuwapraisirisan P. Quercitylcinnamates, a new series of antidiabetic bioconjugates possessing α-glucosidase inhibition and antioxidant. Eur J Med Chem 2013; 66:296-304. [PMID: 23811091 DOI: 10.1016/j.ejmech.2013.05.047] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2013] [Revised: 05/15/2013] [Accepted: 05/30/2013] [Indexed: 10/26/2022]
Abstract
Antidiabetic agents possessing dual functions, α-glucosidase inhibition and antioxidant, have been accepted to be more useful than currently used antidiabetic drugs because they not only suppress hyperglycemia but also prevent risk of complications. Herein, we design antidiabetic bioconjugates comprising of (+)-proto-quercitol as a glucomimic and cinnamic analogs as antioxidant moieties. Fifteen quercitylcinnamates were synthesized by direct coupling through ester bond in the presence of DCC and DMAP. Particular quercityl esters 6a, 7a and 8a selectively inhibited rat intestinal maltase and sucrose 4-6 times more potently than their parents 6, 7 and 8. Of synthesized bioconjugates, 6a was the most potent inhibitor against maltase and sucrose with IC₅₀ values of 5.31 and 43.65 μM, respectively. Of interest, its inhibitory potency toward maltase was 6 times greater than its parent, caffeic acid (6), while its radical scavenging (SC₅₀ 0.11 mM) was comparable to that of commercial antioxidant BHA. Subsequent investigation on mechanism underlying inhibitory effect of 6a indicated that it blocked maltase and sucrose functions by mixed inhibition through competitive and noncompetitive manners.
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Affiliation(s)
- Eakkaphon Rattanangkool
- Natural Products Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
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Ampornpun S, Montha S, Tumcharern G, Vchirawongkwin V, Sukwattanasinitt M, Wacharasindhu S. Odd–Even and Hydrophobicity Effects of Diacetylene Alkyl Chains on Thermochromic Reversibility of Symmetrical and Unsymmetrical Diyndiamide Polydiacetylenes. Macromolecules 2012. [DOI: 10.1021/ma3019798] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sasikarn Ampornpun
- Program of Petrochemistry and
Polymer Science, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Suriyakamon Montha
- National Metals and Materials
Technology Center, National Science and Technology Development Agency, Patumthanee 12120, Thailand
| | - Gamolwan Tumcharern
- Thailand National Nanotechnology
Center, National Science and Technology Development Agency, Patumthanee 12120, Thailand
| | - Viwat Vchirawongkwin
- Nanotec-CU Center of Excellence
on Food and Agriculture, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Mongkol Sukwattanasinitt
- Nanotec-CU Center of Excellence
on Food and Agriculture, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Sumrit Wacharasindhu
- Nanotec-CU Center of Excellence
on Food and Agriculture, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
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Pattanatornchai T, Charoenthai N, Wacharasindhu S, Sukwattanasinitt M, Traiphol R. Control over the color transition behavior of polydiacetylene vesicles using different alcohols. J Colloid Interface Sci 2012; 391:45-53. [PMID: 23123029 DOI: 10.1016/j.jcis.2012.10.004] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2012] [Revised: 10/02/2012] [Accepted: 10/03/2012] [Indexed: 10/27/2022]
Abstract
In this contribution, we investigate the color transition behavior of polydiacetylene (PDA) vesicles upon exposure to different chemical stimuli. A series of linear and branched alcohols are used as model additives, allowing systematic control of their molecular shape and polarity. The PDA vesicles are fabricated by using three monomers, 10,12-pentacosadiynoic acid (PCDA), 10,12-tricosadyinoic acid (TCDA), and N-(2-amino ethyl)pentacosa-10,12-dyinamide (AEPCDA). When a series of linear alcohols is used, the longer alcohol length causes color transition of all PDA vesicles. In this system, the penetration of linear alcohols into the inner layer of PDA vesicles is dictated by their polarity. The change of -OH position within the alcohol molecule also affects the degree of penetration. It requires a higher amount of the 2-propanol to induce color transitions of the PDAs compared to that of the 1-propanol. The addition of methyl branches into the hydrophobic tail of alcohols causes an increase in steric effect, which hinders the penetration as well. When the 2,2-dimethyl-1-propanol is used as a stimulus, the color transition of PDAs occurs at much higher alcohol concentration compared to 2-methyl-1-butanol, 3-methyl-1-butanol, and 1-pentanol. The variation of PDA structures also affects their ability to interact with the alcohols. The modified head group of poly(AEPCDA) promotes the ability to distinguish between 1-propanol and 2-propanol or 1-propanol and ethanol.
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Affiliation(s)
- Thanutpon Pattanatornchai
- Department of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Naresuan University, Phitsanulok 65000, Thailand
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Amornwachirabodee K, Chiablaem K, Wacharasindhu S, Lirdprapamongkol K, Svasti J, Vchirawongkwin V, Wanichwecharungruang SP. Paclitaxel Delivery Using Carrier made from Curcumin Derivative: Synergism Between Carrier and the Loaded Drug for Effective Cancer Treatment. J Pharm Sci 2012; 101:3779-86. [DOI: 10.1002/jps.23263] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2012] [Revised: 06/12/2012] [Accepted: 06/22/2012] [Indexed: 11/07/2022]
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Pongjantarasatian S, Wacharasindhu S, Tongkobpetch S, Suphapeetiporn K, Shotelersuk V. Pathogenic mechanism of mutations in the thyroid hormone receptor β gene. J Endocrinol Invest 2012; 35:557-61. [PMID: 21795843 DOI: 10.3275/7876] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
BACKGROUND Resistance to thyroid hormone (RTH) is characterized by a variable degree of reduced tissue sensitivity to thyroid hormone (TH). It is usually caused by mutations in the TH receptor-β (TRβ) gene. AIMS To characterize clinical and molecular features of a Thai patient with RTH. Functional significance of the identified mutation as well as other uncharacterized TRβ mutations was also investigated. MATERIALS AND METHODS Exons 3-10 of the TRβ gene were assessed by PCR-sequencing. Functional characterization of the mutant TRβ was determined by the luciferase reporter system. RESULTS A mutation in exon 9 of the TRβ gene resulting in a methionine to threonine substitution at codon 313 was identified. The functional consequence of this mutation and other uncharacterized known mutations (p.I276L, p.I280S, p.L330S, p.G344A, p.M442T) was evaluated by transfection studies. Four out of 6 had a significant impairment of T3-dependent transactivation. When co-transfected with the wild-type TRβ, all exhibited a dominant negative effect. CONCLUSION A de novo mutation was identified in the patient with clinical diagnosis of RTH. Our findings provide a strong support that interfering with the T3-mediated transcriptional activation of the wild-type TRβ independent of the ability to activate transcription is a major pathogenic mechanism causing RTH.
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Affiliation(s)
- S Pongjantarasatian
- Center of Excellence for Medical Genetics, Chulalongkorn University, Bangkok, Thailand
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Worawalai W, Wacharasindhu S, Phuwapraisirisan P. Synthesis of new N-substituted aminoquercitols from naturally available (+)-proto-quercitol and their α-glucosidase inhibitory activity. Med Chem Commun 2012. [DOI: 10.1039/c2md20227a] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Eaidkong T, Mungkarndee R, Phollookin C, Tumcharern G, Sukwattanasinitt M, Wacharasindhu S. Polydiacetylene paper-based colorimetric sensor array for vapor phase detection and identification of volatile organic compounds. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm16273c] [Citation(s) in RCA: 131] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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Chuentragool P, Vongnam K, Rashatasakhon P, Sukwattanasinitt M, Wacharasindhu S. Calcium carbide as a cost-effective starting material for symmetrical diarylethynes via Pd-catalyzed coupling reaction. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.08.042] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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36
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Charoenthai N, Pattanatornchai T, Wacharasindhu S, Sukwattanasinitt M, Traiphol R. Roles of head group architecture and side chain length on colorimetric response of polydiacetylene vesicles to temperature, ethanol and pH. J Colloid Interface Sci 2011; 360:565-73. [DOI: 10.1016/j.jcis.2011.04.109] [Citation(s) in RCA: 97] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2011] [Revised: 04/30/2011] [Accepted: 04/30/2011] [Indexed: 11/17/2022]
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Akkarachiyasit S, Yibchok-Anun S, Wacharasindhu S, Adisakwattana S. In vitro inhibitory effects of cyandin-3-rutinoside on pancreatic α-amylase and its combined effect with acarbose. Molecules 2011; 16:2075-83. [PMID: 21368719 PMCID: PMC6259843 DOI: 10.3390/molecules16032075] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2011] [Revised: 02/07/2011] [Accepted: 02/28/2011] [Indexed: 11/16/2022] Open
Abstract
The inhibitory activity on pancreatic α-amylase by cyanidin-3-rutinoside was examined in vitro. The IC50 value of cyanidin-3-rutinoside against pancreatic α-amylase was 24.4 ± 0.1 μM. The kinetic analysis revealed that pancreatic α-amylase was inhibited by cyanidin-3-rutinoside in a non-competitive manner. The additive inhibition of a combination of cyanidin-3-rutinoside with acarbose against pancreatic α-amylase was also found. These results provide the first evidence for the effect of cyanidin-3-rutinoside in a retarded absorption of carbohydrates by inhibition of pancreatic α-amylase which may be useful as a potential inhibitor for prevention and treatment of diabetes mellitus.
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Affiliation(s)
- Sarinya Akkarachiyasit
- Department of Pharmacology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, Thailand; E-Mails: (S.A.); (S.Y-A.)
| | - Sirintorn Yibchok-Anun
- Department of Pharmacology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, Thailand; E-Mails: (S.A.); (S.Y-A.)
| | - Sumrit Wacharasindhu
- Natural Products Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; E-Mail:
| | - Sirichai Adisakwattana
- Department of Transfusion Medicine, Faculty of Allied Health Sciences, The Medical Food Research and Development Center, Chulalongkorn University, Bangkok 10330, Thailand
- Program in Nutrition and Dietetics, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok 10330, Thailand
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +662-218-1067; Fax: +662-218-1076
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Wichitnithad W, Nimmannit U, Wacharasindhu S, Rojsitthisak P. Synthesis, characterization and biological evaluation of succinate prodrugs of curcuminoids for colon cancer treatment. Molecules 2011; 16:1888-900. [PMID: 21343891 PMCID: PMC6259653 DOI: 10.3390/molecules16021888] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2011] [Revised: 01/25/2011] [Accepted: 02/17/2011] [Indexed: 01/31/2023] Open
Abstract
A novel series of succinyl derivatives of three curcuminoids were synthesized as potential prodrugs. Symmetrical (curcumin and bisdesmethoxycurcumin) and unsymmetrical (desmethoxycurcumin) curcuminoids were prepared through aldol condensation of 2,4-pentanedione with different benzaldehydes. Esterification of these compounds with a methyl or ethyl ester of succinyl chloride gave the corresponding succinate prodrugs in excellent yields. Anticolon cancer activity of the compounds was evaluated using Caco-2 cells. The succinate prodrugs had IC50 values in the 1.8–9.6 μM range, compared to IC50 values of 3.3–4.9 μM for the parent compounds. Curcumin diethyl disuccinate exhibited the highest potency and was chosen for stability studies. Hydrolysis of this compound in phosphate buffer at pH 7.4 and in human plasma followed pseudo first-order kinetics. In phosphate buffer, the kobs and t1/2 for hydrolysis indicated that the compound was much more stable than curcumin. In human plasma, this compound was able to release curcumin, therefore our results suggest that succinate prodrugs of curcuminoids are stable in phosphate buffer, release the parent curcumin derivatives readily in human plasma, and show anti-colon cancer activity.
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Affiliation(s)
- Wisut Wichitnithad
- Pharmaceutical Technology (International) Program, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand; E-Mail:
| | - Ubonthip Nimmannit
- Pharmaceutical Technology (International) Program, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand; E-Mail:
- National Nanotechnology Center (Nanotec), National Science and Technology Development Agency, Pathumthani 12120, Thailand; E-Mail:
| | - Sumrit Wacharasindhu
- Natural Products Research Unit, Department of Chemistry, Faculty of Sciences, Chulalongkorn University, Bangkok 10330, Thailand; E-Mail:
| | - Pornchai Rojsitthisak
- Department of Food and Pharmaceutical Chemistry, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +662-218-8310; Fax: +662-254-5195
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Thongmalai W, Eaidkong T, Ampornpun S, Mungkarndee R, Tumcharern G, Sukwattanasinitt M, Wacharasindhu S. Polydiacetylenes carrying amino groups for colorimetric detection and identification of anionic surfactants. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm12795k] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Phollookin C, Wacharasindhu S, Ajavakom A, Tumcharern G, Ampornpun S, Eaidkong T, Sukwattanasinitt M. Tuning Down of Color Transition Temperature of Thermochromically Reversible Bisdiynamide Polydiacetylenes. Macromolecules 2010. [DOI: 10.1021/ma101264k] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Chaiwat Phollookin
- Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University Bangkok, 10330, Thailand
| | - Sumrit Wacharasindhu
- Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University Bangkok, 10330, Thailand
| | - Anawat Ajavakom
- Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University Bangkok, 10330, Thailand
| | - Gamolwan Tumcharern
- Thailand National Nanotechnology Center, National Science and Technology Development Agency Patumthanee, 12120, Thailand
| | - Sasikarn Ampornpun
- Program of Petrochemistry and Polymer Science, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Thichamporn Eaidkong
- Program of Petrochemistry and Polymer Science, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Mongkol Sukwattanasinitt
- Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University Bangkok, 10330, Thailand
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Punthasee P, Vanitcha A, Wacharasindhu S. Mukaiyama’s reagent promoted C–N bond formation: a new method to synthesize 3-alkylquinazolin-4-ones. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.01.087] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Wacharasindhu S, Montha S, Boonyiseng J, Potisatityuenyong A, Phollookin C, Tumcharern G, Sukwattanasinitt M. Tuning of Thermochromic Properties of Polydiacetylene toward Universal Temperature Sensing Materials through Amido Hydrogen Bonding. Macromolecules 2009. [DOI: 10.1021/ma902282c] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sumrit Wacharasindhu
- Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Suriyakamon Montha
- Program of Petrochemistry and Polymer Science, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Jasuma Boonyiseng
- Program of Petrochemistry and Polymer Science, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Anupat Potisatityuenyong
- Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Chaiwat Phollookin
- Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Gamolwan Tumcharern
- Thailand National Nanotechnology Center, National Science and Technology Development Agency, Patumthanee 12120, Thailand
| | - Mongkol Sukwattanasinitt
- Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
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Wacharasindhu S, Bardhan S, Wan ZK, Tabei K, Mansour TS. Oxidative palladium catalysis in S(N)Ar reactions leading to heteroaryl ethers from pyridotriazol-1-yloxy heterocycles with aryl boronic acids. J Am Chem Soc 2009; 131:4174-5. [PMID: 19265423 DOI: 10.1021/ja808622z] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The palladium-catalyzed oxidative coupling of pyrido- and benzotriazol-1-yloxyquinazolines and -thienopyrimidines with aryl boronic acids in the presence of Pd(PPh(3))(4) and Cs(2)CO(3) under oxygen in DME containing 0.4-0.8% water for the preparation of heteroaryl ethers is described. These transformations of triazol-1-yloxy reagents demonstrate excellent O-chemoselective control under mild conditions and good yields. Mechanistic studies based on (18)O labeling indicate that phenols as intermediates in S(N)Ar reactions with ethers are formed in oxidative and nonoxidative pathways.
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Affiliation(s)
- Sumrit Wacharasindhu
- Chemical and Screening Sciences, Wyeth Research, 401 North Middletown Road, Pearl River, New York 10965, USA
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Bardhan S, Wacharasindhu S, Wan ZK, Mansour TS. Heteroaryl Ethers by Oxidative Palladium Catalysis of Pyridotriazol-1-yloxy Pyrimidines with Arylboronic Acids. Org Lett 2009; 11:2511-4. [DOI: 10.1021/ol900592b] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Sujata Bardhan
- Chemical Sciences, Wyeth Research, 401 North Middletown Road, Pearl River, New York 10965 and 200 Cambridge Park Drive, Cambridge, Massachusetts 02140
| | - Sumrit Wacharasindhu
- Chemical Sciences, Wyeth Research, 401 North Middletown Road, Pearl River, New York 10965 and 200 Cambridge Park Drive, Cambridge, Massachusetts 02140
| | - Zhao-Kui Wan
- Chemical Sciences, Wyeth Research, 401 North Middletown Road, Pearl River, New York 10965 and 200 Cambridge Park Drive, Cambridge, Massachusetts 02140
| | - Tarek S. Mansour
- Chemical Sciences, Wyeth Research, 401 North Middletown Road, Pearl River, New York 10965 and 200 Cambridge Park Drive, Cambridge, Massachusetts 02140
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Wacharasindhu S, Worawalai W, Rungprom W, Phuwapraisirisan P. (+)-proto-Quercitol, a natural versatile chiral building block for the synthesis of the α-glucosidase inhibitors, 5-amino-1,2,3,4-cyclohexanetetrols. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.02.153] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Wan ZK, Wacharasindhu S, Levins CG, Lin M, Tabei K, Mansour TS. The Scope and Mechanism of Phosphonium-Mediated SNAr Reactions in Heterocyclic Amides and Ureas. J Org Chem 2007; 72:10194-210. [DOI: 10.1021/jo7020373] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zhao-Kui Wan
- Chemical and Screening Sciences, Wyeth Research, 200 Cambridge Park Drive, Cambridge, Massachusetts 02140, and Chemical and Screening Sciences, Wyeth Research, 401 Middletown Road, Pearl River, New York 10965
| | - Sumrit Wacharasindhu
- Chemical and Screening Sciences, Wyeth Research, 200 Cambridge Park Drive, Cambridge, Massachusetts 02140, and Chemical and Screening Sciences, Wyeth Research, 401 Middletown Road, Pearl River, New York 10965
| | - Christopher G. Levins
- Chemical and Screening Sciences, Wyeth Research, 200 Cambridge Park Drive, Cambridge, Massachusetts 02140, and Chemical and Screening Sciences, Wyeth Research, 401 Middletown Road, Pearl River, New York 10965
| | - Melissa Lin
- Chemical and Screening Sciences, Wyeth Research, 200 Cambridge Park Drive, Cambridge, Massachusetts 02140, and Chemical and Screening Sciences, Wyeth Research, 401 Middletown Road, Pearl River, New York 10965
| | - Keiko Tabei
- Chemical and Screening Sciences, Wyeth Research, 200 Cambridge Park Drive, Cambridge, Massachusetts 02140, and Chemical and Screening Sciences, Wyeth Research, 401 Middletown Road, Pearl River, New York 10965
| | - Tarek S. Mansour
- Chemical and Screening Sciences, Wyeth Research, 200 Cambridge Park Drive, Cambridge, Massachusetts 02140, and Chemical and Screening Sciences, Wyeth Research, 401 Middletown Road, Pearl River, New York 10965
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Li W, Li J, Lin M, Wacharasindhu S, Tabei K, Mansour TS. Dimethyl Sulfoxide Mediated Elimination Reactions in 3-Aryl 2,3-Dihalopropanoates: Scope and Mechanistic Insights. J Org Chem 2007; 72:6016-21. [PMID: 17628103 DOI: 10.1021/jo070217c] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Dimethyl sulfoxide (DMSO) efficiently causes the reductive elimination of 3-aryl 2,3-dibromopropanoates to cinnamates with good yield. With 3-phenyl 2,3-dihalopropanoates, debromination is the major pathway providing 3-phenylacrylate derivatives in high yields, whereas dehydrobromination is a competing pathway with thiophene derivatives. 1H NMR, 81Br NMR, and MS techniques indicated the formation of brominated-DMSO, MeBr, and HBr as byproducts in this transformation with no evidence for the formation of Br2. The dual role of DMSO as a nucleophile and bromine scavenger accounts for the products formed in this reaction.
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Affiliation(s)
- Wei Li
- Chemical and Screening Sciences, Wyeth Research, 200 Cambridge Park Drive, Cambridge, MA 02140, USA.
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Abstract
[reaction: see text] An efficient one-step amination of cyclic amides and ureas has been developed. Treatment of cyclic amides and cyclic ureas with BOP in the presence of DBU in various solvents led to the formation of cyclic amidines and cyclic guanidines in good to excellent yields. Concise syntheses of biologically intriguing kinetin and potent kinase inhibitor olomoucin were thus achieved in just one and two steps, respectively.
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Affiliation(s)
- Zhao-Kui Wan
- Chemical and Screening Sciences, Wyeth Research, Cambridge, Massachusetts 02140, USA.
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Abstract
[reaction: see text] The [4 + 3]-cycloadduct derived from the reaction of 2,5-dibromocyclopentanone with cyclopentadiene was converted via a quasi-Favorskii rearrangement and ring-opening, ring-closing metathesis sequence to the carbocyclic core of the prostanoid tricycloclavulone.
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Affiliation(s)
- Michael Harmata
- Department of Chemistry, University of Missouri-Columbia, Columbia, Missouri 65211, USA.
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