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Xu X, Li RP, Zhang Z, Gong X, Zheng Y, Tang S. Regioselective Synthesis of Multisubstituted 2,3-Dihydrooxazoles by 1,3-Dithiane Umpolung. Org Lett 2024; 26:6825-6829. [PMID: 39110706 DOI: 10.1021/acs.orglett.4c02176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/17/2024]
Abstract
Herein, we report a novel strategy for the regioselective synthesis of aromatic and heteroaromatic 2,3-dihydrooxazoles from 2-alkynyl-1,3-dithianes and nitrones. This method exploits the 1,3-dithiane umpolung, nucleophilic cycloaddition, and rearrangement processes to achieve the rapid assembly of dihydrooxazole molecules. The regioselective method is extremely mild, achieving complete conversion within one min under air at 25 °C with high efficiency.
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Affiliation(s)
- Xiangrong Xu
- School of Pharmacy, Lanzhou University, Lanzhou 730000, P. R. China
| | - Rui-Peng Li
- School of Pharmacy, Lanzhou University, Lanzhou 730000, P. R. China
| | - Zhuzhu Zhang
- School of Pharmacy, Lanzhou University, Lanzhou 730000, P. R. China
| | - Xiaomeng Gong
- School of Pharmacy, Lanzhou University, Lanzhou 730000, P. R. China
| | - Yi Zheng
- School of Pharmacy, Lanzhou University, Lanzhou 730000, P. R. China
| | - Shouchu Tang
- School of Pharmacy, Lanzhou University, Lanzhou 730000, P. R. China
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Chowdhury S, Nandi N. Dynamics of the Catalytic Active Site of Isoleucyl tRNA Synthetase from Staphylococcus aureus bound with Adenylate and Mupirocin. J Phys Chem B 2022; 126:620-633. [PMID: 35015537 DOI: 10.1021/acs.jpcb.1c08555] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The development of new antimicrobial drugs is critically needed due to the alarming increase in antibiotic resistance in bacterial pathogens. The active sites of different bacterial aminoacyl tRNA synthetases (aaRS) are validated targets of antibiotics. At present, the only aaRS inhibitor approved is mupirocin (MRC) which targets bacterial isoleucyl tRNA synthetase (IleRS). The present work is aimed at understanding the lacunae of knowledge concerning the active site conformational dynamics in IleRS in the presence of inhibitor mupirocin. With this end in view, we have carried out classical molecular dynamics simulation and metadynamics simulations of the open state of IleRS from Staphylococcus aureus (SaIleRS), the closed state tripartite complex bound with cognate adenylate (Ile-AMP) and tRNA, the closed state tripartite complex bound with noncognate MRC, and the closed state tripartite complex bound with tRNA and MRC with mutated SaIleRS (V588F). The present simulation established a dynamic picture of SaIleRS complexed with cognate and the noncognate substrates which are completely consistent with crystallographic and biochemical studies and explain the existing lacunae of knowledge. The active site is significantly more compact in the Ile-AMP bound complex compared to the open state due to the closure of the KMSKS and HMGH loops and clamping down of the tRNA acceptor end near the active site gate. The present result shows that the unusual open conformational state of the KMSKS loop observed in the cognate substrate-bound complex in the crystal is due to crystallographic constraints. Although the mupirocin tightly fits the catalytic active site in the MRC-bound complex, the nonanoic acid moiety is partly exposed to the water. The KMSKS loop is pushed open in the MRC-bound complex to accommodate the noncognate MRC. New tunnels open up, extending to the editing site in the complex. Out of its three broad segments, the C12 to C17 segment, the conjugated segment, and the nonanoic moiety, the conjugated part of MRC binds most effectively with the active site of the MRC-bound complex. The aromatic residues packing around the C12 to C17 segment of MRC stabilize the tRNA hairpin conformation in a similar way as observed in the TrpRS. The V588F mutation is weakening the interaction between this region of the active site and weakens the binding of MRC in the active site. This result explains why the V588F mutation is responsible for low-level mupirocin resistance. The free energy of unbinding the conjugated segment (and C12 to C17 segment, as well) largely contributes to the total free energy of unbinding the MRC. The active site organization of IleRS from eukaryotic Candida albicans is compared with the bacterial IleRS active site to understand the low binding affinity in eukaryotic IleRS. The present study could be a starting point of future studies related to the development of effective drug binding in the SaIleRS.
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Affiliation(s)
- Shilpi Chowdhury
- Department of Chemistry Kalyani University Kalyani, West Bengal 741235, India
| | - Nilashis Nandi
- Department of Chemistry Kalyani University Kalyani, West Bengal 741235, India
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Zimin DP, Dar’in DV, Kukushkin VY, Dubovtsev AY. Oxygen Atom Transfer as Key To Reverse Regioselectivity in the Gold(I)-Catalyzed Generation of Aminooxazoles from Ynamides. J Org Chem 2020; 86:1748-1757. [DOI: 10.1021/acs.joc.0c02584] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Dmitry P. Zimin
- Saint Petersburg State University, Universitetskaya Nab. 7/9, 199034 Saint Petersburg, Russian Federation
| | - Dmitry V. Dar’in
- Saint Petersburg State University, Universitetskaya Nab. 7/9, 199034 Saint Petersburg, Russian Federation
| | - Vadim Yu. Kukushkin
- Saint Petersburg State University, Universitetskaya Nab. 7/9, 199034 Saint Petersburg, Russian Federation
- South Ural State University, 76, Lenin Av., Chelyabinsk 454080, Russian Federation
| | - Alexey Yu. Dubovtsev
- Saint Petersburg State University, Universitetskaya Nab. 7/9, 199034 Saint Petersburg, Russian Federation
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Harisha MB, Dhanalakshmi P, Suresh R, Kumar RR, Muthusubramanian S. Access to highly substituted oxazoles by the reaction of α-azidochalcone with potassium thiocyanate. Beilstein J Org Chem 2020; 16:2108-2118. [PMID: 32952727 PMCID: PMC7476590 DOI: 10.3762/bjoc.16.178] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Accepted: 08/21/2020] [Indexed: 12/27/2022] Open
Abstract
The reactivity of α-azidochalcones has been explored for the preparation of highly substituted oxazoles via a 2H-azirine intermediate. The azidochalcones, when treated with potassium thiocyanate in the presence of potassium persulfate, lead to 2,4,5-trisubstituted oxazoles in good yields. Incidentally, 2-aminothiazoles are the products when ferric nitrate is employed instead of persulfate in the above reaction.
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Affiliation(s)
- Mysore Bhyrappa Harisha
- Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai-625 021, Tamil Nadu, India.,Eurofins-Advinus Limited, Phase II, Peenya Industrial Area, Bangalore-560 058, India
| | - Pandi Dhanalakshmi
- Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai-625 021, Tamil Nadu, India.,Department of Inorganic and Physical Chemistry, Indian Institute of Science (IISc), Bangalore-560 012, India
| | - Rajendran Suresh
- Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai-625 021, Tamil Nadu, India
| | - Raju Ranjith Kumar
- Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai-625 021, Tamil Nadu, India
| | - Shanmugam Muthusubramanian
- Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai-625 021, Tamil Nadu, India
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Kotha S, Rao Cheekatla S. Design and Synthesis of Pentacycloundecane Cage Compound Containing Oxazole Moiety. HETEROCYCLES 2020. [DOI: 10.3987/com-20-14288] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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Cao Z, Lv H, Liu Y, Nie Z, Liu H, Yang T, Luo W, Liu Q, Guo C. Dimethyl Sulfoxide Oxygen Donor‐Based Annulation of Ketones and Ammonium Persulfate: Regioselective Synthesis of 2,4‐disubstituted Oxazoles. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201801671] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Zhongzhong Cao
- College of Chemistry and Chemical Engineering, Advanced Catalytic Engineering Research Center of the Ministry of EducationHunan University Changsha 410082 People's Republic of China
| | - Huifang Lv
- College of Chemistry and Chemical Engineering, Advanced Catalytic Engineering Research Center of the Ministry of EducationHunan University Changsha 410082 People's Republic of China
| | - Yufeng Liu
- College of Chemistry and Chemical Engineering, Advanced Catalytic Engineering Research Center of the Ministry of EducationHunan University Changsha 410082 People's Republic of China
| | - Zhiwen Nie
- College of Chemistry and Chemical Engineering, Advanced Catalytic Engineering Research Center of the Ministry of EducationHunan University Changsha 410082 People's Republic of China
| | - Haiping Liu
- College of Chemistry and Chemical Engineering, Advanced Catalytic Engineering Research Center of the Ministry of EducationHunan University Changsha 410082 People's Republic of China
| | - Tonglin Yang
- College of Chemistry and Chemical Engineering, Advanced Catalytic Engineering Research Center of the Ministry of EducationHunan University Changsha 410082 People's Republic of China
| | - Weiping Luo
- College of Chemistry and Chemical Engineering, Advanced Catalytic Engineering Research Center of the Ministry of EducationHunan University Changsha 410082 People's Republic of China
| | - Qiang Liu
- College of Chemistry and Chemical Engineering, Advanced Catalytic Engineering Research Center of the Ministry of EducationHunan University Changsha 410082 People's Republic of China
| | - Cancheng Guo
- College of Chemistry and Chemical Engineering, Advanced Catalytic Engineering Research Center of the Ministry of EducationHunan University Changsha 410082 People's Republic of China
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Abdurakhmanova ER, Lukashuk EI, Golovchenko AV, Brovarets VS. Synthesis and properties of 4-phosphorylated derivatives of 5-hydroxyalkylamino-1,3-oxazoles. RUSS J GEN CHEM+ 2016. [DOI: 10.1134/s1070363216070094] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Chatterjee T, Cho JY, Cho EJ. Synthesis of Substituted Oxazoles by Visible-Light Photocatalysis. J Org Chem 2016; 81:6995-7000. [DOI: 10.1021/acs.joc.6b00989] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Tanmay Chatterjee
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Ji Young Cho
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
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Yurdakul Ş, Badoğlu S, Özkurt L. An experimental and theoretical investigation of free Oxazole in conjunction with the DFT analysis of Oxazole⋯(H₂O)n complexes. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2016; 162:48-60. [PMID: 26978786 DOI: 10.1016/j.saa.2016.02.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Revised: 01/26/2016] [Accepted: 02/14/2016] [Indexed: 06/05/2023]
Abstract
The mid-IR spectrum of Oxazole (Oxa) is recorded. This spectrum is interpreted with the help of B3LYP/6-311++G(d,p) calculations and potential energy distribution (PED) analysis. The experimental spectrum is concordant with the theoretical data. Geometrical parameters and the atomic charges are also theoretically obtained and presented. Solvent effects on the geometrical parameters, vibrational frequencies, and electronic properties of Oxa are analyzed theoretically in chloroform, ethanol, and water. Besides, hydrogen bonded Oxa⋯(H2O)n (n=1, 2,…, 10) complexes are investigated within the PCM solvation model. It is found that the interaction energies in Oxa⋯(H2O)n complexes are influenced by the number of water molecules, and by the arrangement of water molecules.
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Affiliation(s)
- Şenay Yurdakul
- Department of Physics, Faculty of Science, Gazi University, Teknikokullar, 06500, Ankara, Turkey.
| | - Serdar Badoğlu
- Department of Physics, Faculty of Science, Gazi University, Teknikokullar, 06500, Ankara, Turkey
| | - Lütfiye Özkurt
- Department of Physics, Faculty of Science, Gazi University, Teknikokullar, 06500, Ankara, Turkey
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Yoo J, Kim SJ, Son D, Seo H, Baek SY, Maeng CY, Lee C, Kim IS, Jung YH, Lee SM, Park HJ. Computer-aided identification of new histone deacetylase 6 selective inhibitor with anti-sepsis activity. Eur J Med Chem 2016; 116:126-135. [DOI: 10.1016/j.ejmech.2016.03.046] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Revised: 03/16/2016] [Accepted: 03/17/2016] [Indexed: 02/06/2023]
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12
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Ibrar A, Khan I, Abbas N, Farooq U, Khan A. Transition-metal-free synthesis of oxazoles: valuable structural fragments in drug discovery. RSC Adv 2016. [DOI: 10.1039/c6ra19324b] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
This review article encapsulates the recent developments in the metal-free approaches used to construct oxazole moiety.
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Affiliation(s)
- Aliya Ibrar
- Department of Chemistry
- COMSATS Institute of Information Technology
- Abbottabad-22060
- Pakistan
| | - Imtiaz Khan
- Department of Chemistry
- Quaid-i-Azam University
- Islamabad-45320
- Pakistan
| | - Naeem Abbas
- Department of Chemistry
- Quaid-i-Azam University
- Islamabad-45320
- Pakistan
| | - Umar Farooq
- Department of Chemistry
- COMSATS Institute of Information Technology
- Abbottabad-22060
- Pakistan
| | - Ajmal Khan
- Department of Chemistry
- COMSATS Institute of Information Technology
- Abbottabad-22060
- Pakistan
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Lukashuk OI, Abdurakhmanova ER, Kondratyuk KM, Golovchenko OV, Khokhlov KV, Brovarets VS, Kukhar VP. Introduction of chiral 2-(aminoalkyl) substituents into 5-amino-1,3-oxazol-4-ylphosphonic acid derivatives and their use in phosphonodipeptide synthesis. RSC Adv 2015. [DOI: 10.1039/c4ra13819h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Starting from phthalimidoalkanoylamines 1 we have suggested a synthetic route to 5-amino-1,3-oxazol-4-ylphosphonic acid derivatives 5 , which have been further used to obtain phosphonodipeptides 8, 9, and 10 with the original optical purity retained.
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Affiliation(s)
- O. I. Lukashuk
- Institute of Bioorganic Chemistry and Petrochemistry
- National Academy of Sciences of Ukraine
- Kyiv 02660
- Ukraine
| | - E. R. Abdurakhmanova
- Institute of Bioorganic Chemistry and Petrochemistry
- National Academy of Sciences of Ukraine
- Kyiv 02660
- Ukraine
| | - K. M. Kondratyuk
- Institute of Bioorganic Chemistry and Petrochemistry
- National Academy of Sciences of Ukraine
- Kyiv 02660
- Ukraine
| | - O. V. Golovchenko
- Institute of Bioorganic Chemistry and Petrochemistry
- National Academy of Sciences of Ukraine
- Kyiv 02660
- Ukraine
| | - K. V. Khokhlov
- Institute of Bioorganic Chemistry and Petrochemistry
- National Academy of Sciences of Ukraine
- Kyiv 02660
- Ukraine
| | - V. S. Brovarets
- Institute of Bioorganic Chemistry and Petrochemistry
- National Academy of Sciences of Ukraine
- Kyiv 02660
- Ukraine
| | - V. P. Kukhar
- Institute of Bioorganic Chemistry and Petrochemistry
- National Academy of Sciences of Ukraine
- Kyiv 02660
- Ukraine
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5-alkyl-1,3-oxazole derivatives of 6-amino-nicotinic acids as alkyl ester bioisosteres are antagonists of the P2Y12 receptor. Future Med Chem 2014; 5:2037-56. [PMID: 24215345 DOI: 10.4155/fmc.13.171] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Recently, we reported ethyl nicotinates as antagonists of the P2Y12 receptor, which is an important target in antiplatelet therapies. A potential liability of these compounds was their generally high in vivo clearance due to ethyl ester hydrolysis. RESULTS Shape and electrostatic similarity matching was used to select five-membered heterocycles to replace the ethyl ester functionality. The 5-methyl and 5-ethyl-oxazole bioisosteres retained the sub-micromolar potency levels of the parent ethyl esters. Many oxazoles showed a higher CYP450 dependent microsomal metabolism than the corresponding ethyl esters. Structure activity relationship investigations supported by ab initio calculations suggested that a correctly positioned alkyl substituent and a strong hydrogen bond acceptor were necessary structural motifs for binding. In rat pharmacokinetics, the low clearance was retained upon replacement of an ethyl ester with a 5-ethyl-oxazole. CONCLUSION The use of shape and electrostatic similarity led to the successful replacement of a metabolically labile ethyl ester functionality with 5-alkyl-oxazole bioisosteres.
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15
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Abstract
2,5- and 2,4,5-substituted oxazoles were prepared in one-pot by the NBS/Me2S-mediated cyclization of enamides in the presence of base.
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Affiliation(s)
- Niranjan Panda
- Department of Chemistry
- National Institute of Technology
- Rourkela-769008, India
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Eftekhari-Sis B, Zirak M, Akbari A. Arylglyoxals in Synthesis of Heterocyclic Compounds. Chem Rev 2013; 113:2958-3043. [DOI: 10.1021/cr300176g] [Citation(s) in RCA: 228] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Bagher Eftekhari-Sis
- Department of Chemistry, Faculty
of Science, University of Maragheh, Golshahr,
P.O. Box. 55181-83111, Maragheh, Iran
| | - Maryam Zirak
- Department of Chemistry, Payame Noor University, P.O. Box 19395-3697, Tehran,
Iran
| | - Ali Akbari
- Department of Chemistry, Faculty
of Science, University of Maragheh, Golshahr,
P.O. Box. 55181-83111, Maragheh, Iran
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Cheung CW, Buchwald SL. Room temperature copper(II)-catalyzed oxidative cyclization of enamides to 2,5-disubstituted oxazoles via vinylic C-H functionalization. J Org Chem 2012; 77:7526-37. [PMID: 22838632 PMCID: PMC3454444 DOI: 10.1021/jo301332s] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
A copper(II)-catalyzed oxidative cyclization of enamides to oxazoles via vinylic C-H bond functionalization at room temperature is described. Various 2,5-disubstituted oxazoles bearing aryl, vinyl, alkyl, and heteroaryl substituents could be synthesized in moderate to high yields. This reaction protocol is complementary to our previously reported iodine-mediated cyclization of enamides to afford 2,4,5-trisubstituted oxazoles.
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Affiliation(s)
- Chi Wai Cheung
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
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Lopes S, Nunes CM, Gómez-Zavaglia A, Pinho e Melo TMVD, Fausto R. Conformational Space and Vibrational Spectra of Methyl 4-Chloro-5-phenyl-1,3-oxazole-2-carboxylate. J Phys Chem A 2010; 114:9074-82. [DOI: 10.1021/jp103665b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Susy Lopes
- Department of Chemistry, University of Coimbra, P-3004-535 Coimbra, Portugal, and Centro de Investigación y Desarrollo en Criotecnología de Alimentos (Conicet La Plata, UNLP), RA-1900 La Plata, Argentina
| | - Cláudio M. Nunes
- Department of Chemistry, University of Coimbra, P-3004-535 Coimbra, Portugal, and Centro de Investigación y Desarrollo en Criotecnología de Alimentos (Conicet La Plata, UNLP), RA-1900 La Plata, Argentina
| | - Andrea Gómez-Zavaglia
- Department of Chemistry, University of Coimbra, P-3004-535 Coimbra, Portugal, and Centro de Investigación y Desarrollo en Criotecnología de Alimentos (Conicet La Plata, UNLP), RA-1900 La Plata, Argentina
| | - Teresa M. V. D. Pinho e Melo
- Department of Chemistry, University of Coimbra, P-3004-535 Coimbra, Portugal, and Centro de Investigación y Desarrollo en Criotecnología de Alimentos (Conicet La Plata, UNLP), RA-1900 La Plata, Argentina
| | - Rui Fausto
- Department of Chemistry, University of Coimbra, P-3004-535 Coimbra, Portugal, and Centro de Investigación y Desarrollo en Criotecnología de Alimentos (Conicet La Plata, UNLP), RA-1900 La Plata, Argentina
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Multicomponent synthesis of dihydrobenzoxazepinones, bearing four diversity points, as potential α-helix mimics. Mol Divers 2009; 14:425-42. [DOI: 10.1007/s11030-009-9210-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2009] [Accepted: 10/24/2009] [Indexed: 10/20/2022]
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Smith CD, Batey RA. Scandium triflate and secondary amine promoted AA′B 2:1 coupling and formal inverse electron demand Diels–Alder reactions of dienals. Tetrahedron 2008. [DOI: 10.1016/j.tet.2007.11.035] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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22
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A facile synthesis of oxazolo[3,2-a][1,10]phenanthrolines via a new multicomponent reaction. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.03.048] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Nolt MB, Smiley MA, Varga SL, McClain RT, Wolkenberg SE, Lindsley CW. Convenient preparation of substituted 5-aminooxazoles via a microwave-assisted Cornforth rearrangement. Tetrahedron 2006. [DOI: 10.1016/j.tet.2005.12.065] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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D. Shipe W, Yang F, Zhao Z, E. Wolkenberg S, Brad Nolt M, W. Lindsley C. Convenient and General Microwave-Assisted Protocols for the Expedient Synthesis of Heterocycles. HETEROCYCLES 2006. [DOI: 10.3987/rev-06-sr(w)1] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Yu XY, Finn J, Hill JM, Wang ZG, Keith D, Silverman J, Oliver N. A series of spirocyclic analogues as potent inhibitors of bacterial phenylalanyl- t RNA synthetases. Bioorg Med Chem Lett 2004; 14:1339-42. [PMID: 14980694 DOI: 10.1016/j.bmcl.2003.11.081] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2003] [Accepted: 11/26/2003] [Indexed: 10/26/2022]
Abstract
We have identified a series of spirocyclic furan and pyrrolidine inhibitors of Enterococcus faecalis and Staphylococcus aureus phenylalanyl-tRNA synthetases. The most potent analogue 1b showed IC50=5 nM (E. faecalis PheRS) and IC50=2 nM (S. aureus PheRS) with high selectivity over the human enzyme. The crystal X-ray structure of analogue 1b was determined.
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Affiliation(s)
- Xiang Y Yu
- Department of Medicinal Chemistry, Cubist Pharmaceuticals Inc., 65 Hayden Avenue, Lexington, MA 02421, USA.
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Chen X, Wang W. Chapter 32. The use of bioisosteric groups in lead optimization. ANNUAL REPORTS IN MEDICINAL CHEMISTRY 2003. [DOI: 10.1016/s0065-7743(03)38033-9] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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Dhanak D, Christmann LT, Darcy MG, Keenan RM, Knight SD, Lee J, Ridgers LH, Sarau HM, Shah DH, White JR, Zhang L. Discovery of potent and selective phenylalanine derived CCR3 receptor antagonists. Part 2. Bioorg Med Chem Lett 2001; 11:1445-50. [PMID: 11378374 DOI: 10.1016/s0960-894x(01)00249-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Highly potent CCR3 antagonists have been developed from a previously reported series of phenylalanine ester-based leads. Solution-phase, parallel synthesis optimization was utilized to identify highly potent, functional CCR3 antagonists.
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Affiliation(s)
- D Dhanak
- SmithKline Beecham Pharmaceuticals, 1250 South Collegeville Road, PO Box 5089, Collegeville, PA 19426-0989, USA.
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Bernier S, Dubois DY, Therrien M, Lapointe J, Chênevert R. Synthesis of glutaminyl adenylate analogues that are inhibitors of glutaminyl-tRNA synthetase. Bioorg Med Chem Lett 2000; 10:2441-4. [PMID: 11078196 DOI: 10.1016/s0960-894x(00)00478-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Glutaminol adenylate 5 is a competitive inhibitor of glutaminyl-tRNA synthetase with respect to glutamine (Ki = 280 nM) and to ATP (Ki = 860 nM). The corresponding methyl phosphate ester 4 is a weaker inhibitor (Ki approximately 10 microM) with respect to glutamine.
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Affiliation(s)
- S Bernier
- Département de Chimie, Centre de Recherche sur la Fonction, la Structure et l'Ingénierie des Protéines (CREFSIP), Faculté des Sciences et de Génie, Université Laval, Québec, Canada
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29
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Roth VR, Murphy C, Perl TM, DeMaria A, Sohn AH, Sinkowitz-Cochran RL, Jarvis WR. Should we routinely use mupirocin to prevent staphylococcal infections? Infect Control Hosp Epidemiol 2000; 21:745-9. [PMID: 11089665 DOI: 10.1086/501720] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Routine use of mupirocin to prevent staphylococcal infections is controversial. We assessed attitudes and practices of healthcare professionals attending the Fourth Decennial International Conference on Nosocomial and Healthcare-Associated Infections regarding mupirocin prophylaxis. Eighty percent of participants did not use mupirocin routinely. At the end of the session, 58% indicated they would consider increased use of mupirocin.
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Affiliation(s)
- V R Roth
- Division of Applied Public Health Training, Epidemiology Program Office, Centers for Disease Control and Prevention, Public Health Service, United States Department of Health and Human Services, Atlanta, Georgia, USA
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30
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Buchanan JL, Mani UN, Plake HR, Holt DA. Practical synthesis of fully-substituted peptide thiazoles. Tetrahedron Lett 1999. [DOI: 10.1016/s0040-4039(99)00659-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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31
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Yu XY, Hill JM, Yu G, Wang W, Kluge AF, Wendler P, Gallant P. Synthesis and structure-activity relationships of a series of novel thiazoles as inhibitors of aminoacyl-tRNA synthetases. Bioorg Med Chem Lett 1999; 9:375-80. [PMID: 10091687 DOI: 10.1016/s0960-894x(98)00738-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
A series of novel aminoacyl adenylate mimics has been prepared and evaluated for their inhibitory activity against aminoacyl-tRNA synthetases. Several of these thiazole derivatives displayed potent and selective enzyme activity against both Gram-positive and Gram-negative bacteria.
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Affiliation(s)
- X Y Yu
- Department of Medicinal Chemistry, Cubist Pharmaceuticals, Inc., Cambridge, MA 02139, USA
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32
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33
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Desjardins M, Desgagnés J, Lacoste L, Yang F, Morin MP, Lapointe J, Chênevert R. Synthesis of inhibitors of glutamyl-tRNA synthetase. Bioorg Med Chem Lett 1997. [DOI: 10.1016/s0960-894x(97)00434-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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