1
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Yano T, Yamada T, Isida H, Ohashi N, Itoh T. 2-cyanopyridine derivatives enable N-terminal cysteine bioconjugation and peptide bond cleavage of glutathione under aqueous and mild conditions. RSC Adv 2024; 14:6542-6547. [PMID: 38390509 PMCID: PMC10882492 DOI: 10.1039/d4ra00437j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Accepted: 02/12/2024] [Indexed: 02/24/2024] Open
Abstract
Inspired by the chemical reactivity of apalutamide, we have developed an efficient method for N-terminal cysteine bioconjugation with 2-cyanopyridine derivatives. Systematic investigations of various 2-cyanopyridines revealed that 2-cyanopyridines with electron-withdrawing groups react efficiently with cysteine under aqueous and mild conditions. Moreover, the highly reactive 2-cyanopyridines enable the peptide bond cleavage of glutathione. The utility of our method is demonstrated by its application to the cysteine-selective chemical modification of bioactive peptides.
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Affiliation(s)
- Tetsuya Yano
- Showa Pharmaceutical University Machida Tokyo 194-8543 Japan
| | - Takahiro Yamada
- Showa Pharmaceutical University Machida Tokyo 194-8543 Japan
| | - Hiroaki Isida
- Showa Pharmaceutical University Machida Tokyo 194-8543 Japan
| | - Nami Ohashi
- Showa Pharmaceutical University Machida Tokyo 194-8543 Japan
| | - Toshimasa Itoh
- Showa Pharmaceutical University Machida Tokyo 194-8543 Japan
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2
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Banfi L, Basso A, Lambruschini C, Moni L, Riva R. The 100 facets of the Passerini reaction. Chem Sci 2021; 12:15445-15472. [PMID: 35003575 PMCID: PMC8654045 DOI: 10.1039/d1sc03810a] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 09/29/2021] [Indexed: 01/07/2023] Open
Abstract
This perspective aims at celebrating the 100th anniversary of the discovery of the Passerini three component reaction. After being nearly neglected for many years, now this reaction has become quite popular, thanks to the achievements of the last 30 years, which have revealed several chances of exploitation in organic synthesis. Though not being comprehensive, this review means to show the various ways that have been used in order to expand the utility of the Passerini reaction. Post-MCR transformations to give heterocycles or peptidomimetics, variants through single component replacement, stereochemical issues, and applications in total syntheses will be especially covered.
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Affiliation(s)
- Luca Banfi
- Department of Chemistry and Industrial Chemistry, University of Genova Via Dodecaneso 31 16146 Genova Italy
| | - Andrea Basso
- Department of Chemistry and Industrial Chemistry, University of Genova Via Dodecaneso 31 16146 Genova Italy
| | - Chiara Lambruschini
- Department of Chemistry and Industrial Chemistry, University of Genova Via Dodecaneso 31 16146 Genova Italy
| | - Lisa Moni
- Department of Chemistry and Industrial Chemistry, University of Genova Via Dodecaneso 31 16146 Genova Italy
| | - Renata Riva
- Department of Chemistry and Industrial Chemistry, University of Genova Via Dodecaneso 31 16146 Genova Italy
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3
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Sierra S, Dalmau D, Higuera S, Cortés D, Crespo O, Jimenez AI, Pop A, Silvestru C, Urriolabeitia EP. Reactivity of ( Z)-4-Aryliden-5(4 H)-thiazolones: [2 + 2]-Photocycloaddition, Ring-Opening Reactions, and Influence of the Lewis Acid BF 3. J Org Chem 2021; 86:12119-12140. [PMID: 34479406 PMCID: PMC9129068 DOI: 10.1021/acs.joc.1c01458] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
The
irradiation of (Z)-2-phenyl-4-aryliden-5(4H)-thiazolones 2 with blue light (465 nm) in
CH2Cl2 solution promotes [2 + 2]-photocycloaddition
of the exocyclic C=C bonds and the formation of the dispirocyclobutanes 3. This reaction takes place with high stereoselectivity,
given that the ε-isomer (1,3 head-to-tail syn coupling) is formed
in more than 90% yield in most of the cases. However, irradiation
of 5(4H)-thiazolones 2 with blue light
(456 nm) in dry MeOH in the presence of BF3·OEt2 leads to the monospirocyclobutanes 4 with full
stereoselectivity, also affording the ε-isomer. A ring-opening
reaction of only one of the thiazolone rings appears to have taken
place in 4 upon methanolysis, leading to the corresponding
ester and thioamide groups. The treatment of free 4-aryliden-5(4H)-thiazolones 2 with a base in alcohol (NaOR/ROH)
also produces a ring-opening reaction of the heterocycle by methanolysis,
although, under these reaction conditions, further intramolecular
S-attack at the exocyclic C(H)=C bond and cyclization is observed,
forming the dihydrothiazoles 5 or 6 as mixtures
of cis (RS/SR)-
and trans (RR/SS)-isomers with high diastereomeric excess. trans-(RR/SS)-Dihydrothiazoles 6 can be
isolated as pure diastereoisomers by column chromatography. Surprisingly,
dihydrothiazoles 5 can also be obtained by the treatment
of 4-aryliden-5(4H)-thiazolones 2 with
BF3·OEt2 in methanol in the absence of
a base.
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Affiliation(s)
- Sonia Sierra
- Instituto de Síntesis Química y Catálisis Homogénea, ISQCH (CSIC-Universidad de Zaragoza), Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - David Dalmau
- Instituto de Síntesis Química y Catálisis Homogénea, ISQCH (CSIC-Universidad de Zaragoza), Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Sheila Higuera
- Instituto de Síntesis Química y Catálisis Homogénea, ISQCH (CSIC-Universidad de Zaragoza), Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Darío Cortés
- Instituto de Síntesis Química y Catálisis Homogénea, ISQCH (CSIC-Universidad de Zaragoza), Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Olga Crespo
- Instituto de Síntesis Química y Catálisis Homogénea, ISQCH (CSIC-Universidad de Zaragoza), Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Ana I Jimenez
- Instituto de Síntesis Química y Catálisis Homogénea, ISQCH (CSIC-Universidad de Zaragoza), Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Alexandra Pop
- Supramolecular Organic and Organometallic Chemistry Centre, Department of Chemistry, Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Str. Arany Janos 11, 400028 Cluj-Napoca, Romania
| | - Cristian Silvestru
- Supramolecular Organic and Organometallic Chemistry Centre, Department of Chemistry, Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Str. Arany Janos 11, 400028 Cluj-Napoca, Romania
| | - Esteban P Urriolabeitia
- Instituto de Síntesis Química y Catálisis Homogénea, ISQCH (CSIC-Universidad de Zaragoza), Pedro Cerbuna 12, 50009 Zaragoza, Spain
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4
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Popy DA. Metal Mediated Synthesis of 2‐thiazolines: Access to Regio‐ and Stereoselective
N
,
S
‐heterocycles. ChemistrySelect 2021. [DOI: 10.1002/slct.202100263] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Dilruba A. Popy
- Department of Chemistry Bangabandhu Sheikh Mujibur Rahman Science and Technology University Gopalganj 8100 Bangladesh
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5
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Vishwanatha TM, Giepmans B, Goda SK, Dömling A. Tubulysin Synthesis Featuring Stereoselective Catalysis and Highly Convergent Multicomponent Assembly. Org Lett 2020; 22:5396-5400. [PMID: 32584589 PMCID: PMC7372561 DOI: 10.1021/acs.orglett.0c01718] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Indexed: 02/08/2023]
Abstract
A concise and modular total synthesis of the highly potent N14-desacetoxytubulysin H (1) has been accomplished in 18 steps in an overall yield of up to 30%. Our work highlights the complexity-augmenting and route-shortening power of diastereoselective multicomponent reaction (MCR) as well as the role of bulky ligands to perfectly control both the regioselective and diastereoselective synthesis of tubuphenylalanine in just two steps. The total synthesis not only provides an operationally simple and step economy but will also stimulate major advances in the development of new tubulysin analogues.
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Affiliation(s)
| | - Ben Giepmans
- University Medical College Groningen, 9700 AD Groningen, The Netherlands
| | - Sayed K. Goda
- Faculty of Science, Chemistry Department, Cairo University, Giza, Egypt
| | - Alexander Dömling
- Department of Drug
Design, University of Groningen, A. Deusinglaan 1, 9700 AD Groningen, The Netherlands
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6
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Abstract
In this Review, we consider all the publications since the beginning of the century that describe tandem reactions resulting in the formation of five-membered aromatic nitrogen heterocycles (thiazole, imidazole, indole, tetrazole, triazole, and isoxazole). The contents of this review are organized by taxonomy and type of tandem catalysis. It covers orthogonal, auto-, and assisted tandem catalysis, providing an overview of tandem reactions applied tonitrogen heterocycles reported in the literature up to March 2020. We believe that this compilation of data will provide a necessary starting reference to developthe applications of tandem catalysis in medicinal chemistry.
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7
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Liu Y, Ma Z, Zhao X, Shan Q, He P, Du Y, Wang Y. Simple and Efficient Synthesis of Anithiactins A‐C, Thiasporine A and Their Potent Antitumor 2,4‐Linked Oligothiazole Derivatives. ChemistrySelect 2019. [DOI: 10.1002/slct.201803664] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Yi Liu
- School of Chemistry and Chemical EngineeringYantai University Yantai 264005 China
| | - Zhanwei Ma
- School of Chemistry and Chemical EngineeringYantai University Yantai 264005 China
| | - Xiangyun Zhao
- School of Chemistry and Chemical EngineeringYantai University Yantai 264005 China
| | - Qiuli Shan
- School of Biological Science and TechnologyUniversity of Jinan Jinan 250022 China
| | - Peng He
- State Key Laboratory of Environmental Chemistry and Eco-toxicologyResearch Center for Eco-Environmental SciencesChinese Academy of Sciences Beijing 100085 China
| | - Yuguo Du
- State Key Laboratory of Environmental Chemistry and Eco-toxicologyResearch Center for Eco-Environmental SciencesChinese Academy of Sciences Beijing 100085 China
| | - Yibin Wang
- Key Laboratory of Marine Ecology and Environmental Science and EngineeringFirst Institute of Oceanography State Oceanic Administration Qingdao 266061 China
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8
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Wang Y, Liu Q, Wei Z, Liu N, Li Y, Li D, Jin Z, Xu X. Thiazole Amides, A Novel Class of Algaecides against Freshwater Harmful Algae. Sci Rep 2018; 8:8555. [PMID: 29867206 PMCID: PMC5986738 DOI: 10.1038/s41598-018-26911-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Accepted: 04/13/2018] [Indexed: 11/29/2022] Open
Abstract
Currently, harmful algal blooms are being one of ever-increasing global environmental problems. Much attention has been paid to the use of natural products as the selective algaecides due to their low toxicity, high selectivity and eco-friendly properties. In the present study, the thiazole alkaloid (1), originally isolated from Thermoactino-myces strain TM-64, was shown to exhibit potent algicidal activity against three typically harmful cyanobacterial algae, S. obliqnus, M. aeruginosa, and C. pyrenoidosa. Based on our previous work, a practical, scalable synthesis of alkaloid (1) was developed and reaction could be readily scaled up to more than 100 g. In addition, twenty-six analogues of alkaloid (1) by replacement of tryptamine moiety with different aromatic and aliphatic amines were also prepared. The bioassay results showed that most of these derivatives displayed potent algicidal activity against three harmful algae S. obliqnus, M. aeruginosa, and C. pyrenoidosa with IC50 values in the range of 1.5-5.0 μg/mL. Amongst them, compounds (10) and its hydrochloric salt (10S) were found to reveal powerful growth inhibitory activity against harmful cyanobacterial algae with IC50 values as low as 0.08 μg/mL, comparable to those of commercial algicide CuSO4 and herbicide Diuron.
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Affiliation(s)
- Ying Wang
- State Key Laboratory and Institute of Elementoorganic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Qisheng Liu
- State Key Laboratory and Institute of Elementoorganic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Zhigang Wei
- State Key Laboratory and Institute of Elementoorganic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Na Liu
- State Key Laboratory and Institute of Elementoorganic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Yajuan Li
- State Key Laboratory and Institute of Elementoorganic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Duo Li
- State Key Laboratory and Institute of Elementoorganic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Zhong Jin
- State Key Laboratory and Institute of Elementoorganic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R. China.
| | - Xiaohua Xu
- State Key Laboratory and Institute of Elementoorganic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R. China.
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300071, P. R. China.
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9
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10
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Liu Y, He P, Zhang Y, Zhang X, Liu J, Du Y. One-Pot Enantiomeric Synthesis of Thiazole-Containing Amino Acids: Total Synthesis of Venturamides A and B. J Org Chem 2018. [DOI: 10.1021/acs.joc.8b00244] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yi Liu
- State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- School of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China
| | - Peng He
- State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yang Zhang
- State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiangyu Zhang
- School of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China
| | - Jun Liu
- State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Yuguo Du
- State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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11
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Vishwanatha TM, Kurpiewska K, Kalinowska-Tłuścik J, Dömling A. Cysteine Isocyanide in Multicomponent Reaction: Synthesis of Peptido-Mimetic 1,3-Azoles. J Org Chem 2017; 82:9585-9594. [PMID: 28817272 PMCID: PMC5603900 DOI: 10.1021/acs.joc.7b01615] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
An alternative approach toward the
simple and robust synthesis
of highly substituted peptidic thiazole derivatives using Ugi-multicomponent
reaction (U-MCR) is described. Thus, we introduced the enantiopure
(R)-2-methyl-2-isocyano-3-(tritylthio)propanoate
as a novel class of isocyanide in MCR. This bifunctional isocyanide
was found to undergo mild cyclodehydration to afford thiazole containing
peptidomimetics in a short synthetic sequence. Several examples of
bis-heterocyclic rings were also synthesized through the proper choice
of the aldehyde component in the U-4CR. The method opens a wide range
of applications toward the synthesis of nonribosomal natural products
and other bioactive compounds.
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Affiliation(s)
- Thimmalapura M Vishwanatha
- University of Groningen , Department of Drug Design, A. Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Katarzyna Kurpiewska
- Jagiellonian University , Department of Crystal Chemistry and Crystal Physics, Ingardena 3, 30-060 Krakow, Poland
| | - Justyna Kalinowska-Tłuścik
- Jagiellonian University , Department of Crystal Chemistry and Crystal Physics, Ingardena 3, 30-060 Krakow, Poland
| | - Alexander Dömling
- University of Groningen , Department of Drug Design, A. Deusinglaan 1, 9713 AV Groningen, The Netherlands
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12
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Lamb RA, Badart MP, Swaney BE, Gai S, Baird SK, Hawkins BC. The Synthesis and Biological Evaluation of Anithiactin A/Thiasporine C and Analogues. Aust J Chem 2015. [DOI: 10.1071/ch15461] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The synthesis of anithiactin A has been achieved in four steps. Several closely related analogues were synthesised and their biological activity against colon and breast cancer cell lines evaluated. Anithiactin A was found not to be cytotoxic even at a high concentration (100 μM); however, two 4-substituted phenyl thiazoles were found to be moderately cytotoxic at 10 μM. Based on these results, 4-substitution on the phenyl group appears to be critical for cytotoxicity. However, the exact electronic and structural requirements are unclear.
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13
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Chen QY, Liu Y, Cai W, Luesch H. Improved total synthesis and biological evaluation of potent apratoxin S4 based anticancer agents with differential stability and further enhanced activity. J Med Chem 2014; 57:3011-29. [PMID: 24660812 PMCID: PMC3993931 DOI: 10.1021/jm4019965] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Apratoxins are cytotoxic natural products originally isolated from marine cyanobacteria that act by preventing cotranslational translocation early in the secretory pathway to downregulate receptor levels and inhibit growth factor secretion, leading to potent antiproliferative activity. Through rational design and total synthesis of an apratoxin A/E hybrid, apratoxin S4 (1a), we have previously improved the antitumor activity and tolerability in vivo. Compound 1a and newly designed analogues apratoxins S7-S9 (1b-d), with various degrees of methylation at C34 (1b,c) or epimeric configuration at C30 (1d), were efficiently synthesized utilizing improved procedures. Optimizations have been applied to the synthesis of key intermediate aldehyde 7 and further include the application of Leighton's silanes and modifications of Kelly's methods to induce thiazoline ring formation in other crucial steps of the apratoxin synthesis. Apratoxin S9 (1d) exhibited increased activity with subnanomolar potency. Apratoxin S8 (1c) lacks the propensity to be deactivated by dehydration and showed efficacy in a human HCT116 xenograft mouse model.
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Affiliation(s)
- Qi-Yin Chen
- Department of Medicinal Chemistry and ‡Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida , Gainesville, Florida, United States
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14
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Bengtsson C, Nelander H, Almqvist F. Asymmetric synthesis of 2,4,5-trisubstituted Δ2-thiazolines. Chemistry 2013; 19:9916-22. [PMID: 23776083 PMCID: PMC3784040 DOI: 10.1002/chem.201301120] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Indexed: 11/28/2022]
Abstract
Δ2-Thiazolines are interesting heterocycles that display a wide variety of biological characteristics. They are also common in chiral ligands used for asymmetric syntheses and as synthetic intermediates. Herein, we present asymmetric routes to 2,4,5-trisubstituted Δ2-thiazolines. These Δ2-thiazolines were synthesized from readily accessible/commercially available α,β-unsaturated methyl esters through a Sharpless asymmetric dihydroxylation and an O→N acyl migration reaction as key steps. The final products were obtained in good yields with up to 97% enantiomeric excess.
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15
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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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16
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Liu Y, Liu J, Qi X, Du Y. One-Pot Synthesis of 2,4-Disubstituted Thiazoline from β-Azido Disulfide and Carboxylic Acid. J Org Chem 2012; 77:7108-13. [DOI: 10.1021/jo301030k] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Yi Liu
- School of Chemistry and Chemical
Engineering, Graduate University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jun Liu
- State Key Laboratory of Environmental Chemistry
and Eco-toxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Xiangbing Qi
- Department of Biochemistry, Division of Chemistry, University of Texas Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard, Dallas, Texas 75390-9038, United States
| | - Yuguo Du
- State Key Laboratory of Environmental Chemistry
and Eco-toxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- School of Chemistry and Chemical
Engineering, Graduate University of Chinese Academy of Sciences, Beijing 100049, China
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17
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Dawsey AC, Li V, Hamilton KC, Wang J, Williams TJ. Copper-catalyzed oxidation of azolines to azoles. Dalton Trans 2012; 41:7994-8002. [PMID: 22460353 DOI: 10.1039/c2dt00025c] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report herein convenient, aerobic conditions for the oxidation of thiazolines to thiazoles and data regarding the oxidation mechanism. These reactions feature operationally simple and environmentally benign conditions and proceed in good yield to afford the corresponding azoles, thus enabling the inexpensive preparation of valuable molecular building blocks. Incorporation of a novel diimine-ligated copper catalyst, [((Mes)DAB(Me))Cu(II)(OH(2))(3)](2+) [(-)OTf](2), provides increased reaction efficiency in many cases. In other cases copper-free conditions involving a stoichiometric quantity of base affords superior results.
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Affiliation(s)
- Anna C Dawsey
- University of Southern California, 837 Bloom Walk, Los Angeles, California 90089-1661, USA
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18
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Chorell E, Pinkner JS, Bengtsson C, Edvinsson S, Cusumano CK, Rosenbaum E, Johansson LBÅ, Hultgren SJ, Almqvist F. Design and synthesis of fluorescent pilicides and curlicides: bioactive tools to study bacterial virulence mechanisms. Chemistry 2012; 18:4522-32. [PMID: 22431310 PMCID: PMC3569613 DOI: 10.1002/chem.201103936] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2011] [Indexed: 11/13/2022]
Abstract
Pilicides and curlicides are compounds that block the formation of the virulence factors pili and curli, respectively. To facilitate studies of the interaction between these compounds and the pili and curli assembly systems, fluorescent pilicides and curlicides have been synthesized. This was achieved by using a strategy based on structure–activity knowledge, in which key pilicide and curlicide substituents on the ring-fused dihydrothiazolo 2-pyridone central fragment were replaced by fluorophores. Several of the resulting fluorescent compounds had improved activities as measured in pili- and curli-dependent biofilm assays. We created fluorescent pilicides and curlicides by introducing coumarin and 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) fluorophores at two positions on the peptidomimetic pilicide and curlicide central fragment. Fluorescence images of the uropathogenic Escherichia coli (UPEC) strain UTI89 grown in the presence of these compounds shows that the compounds are strongly associated with the bacteria with a heterogeneous distribution.
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Affiliation(s)
- Erik Chorell
- Department of Chemistry, Umeå University, 90187 Umeå, Sweden
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19
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Khan IA, Saxena AK. Employing lactams for the unprecedented enantiopure synthesis of non-natural amino acid derivatives. Tetrahedron 2012. [DOI: 10.1016/j.tet.2011.11.047] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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20
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Umezawa T, Sueda M, Kamura T, Kawahara T, Han X, Okino T, Matsuda F. Synthesis and biological activity of kalkitoxin and its analogues. J Org Chem 2011; 77:357-70. [PMID: 22111947 DOI: 10.1021/jo201951s] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Total syntheses of kalkitoxin, isolated from the Caribbean Lyngbya majuscula, and its analogues, 3-epi-, 7-epi-, 8-epi-, 10-epi-, 10-nor-, and 16-nor-kalkitoxin, were achieved via oxazolidinone-based diastereoselective 1,4-addition reaction of a methyl group and efficient TiCl(4)-mediated thiazoline ring formation as the key steps. The biological activities of synthetic kalkitoxin and its analogues were evaluated with brine shrimp.
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Affiliation(s)
- Taiki Umezawa
- Division of Environmental Materials Science, Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan
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21
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Salimi F, Sahebalzamani H, Maleki M, Notash B. N,N'-Bis(1,3-thia-zol-2-yl)methyl-ene-diamine. Acta Crystallogr Sect E Struct Rep Online 2011; 67:o3320. [PMID: 22199819 PMCID: PMC3238970 DOI: 10.1107/s1600536811047659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2011] [Accepted: 11/10/2011] [Indexed: 05/31/2023]
Abstract
In the title compound, C(7)H(8)N(4)S(2), the dihedral angle between the thia-zoline rings is 71.25 (13)°. In the crystal, inter-molecular N-H⋯N hydrogen bonds connect the mol-ecules into zigzag chains parallel to the ab plane.
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Affiliation(s)
- Farshid Salimi
- Department of Chemistry, Faculty of Science, Ardabil Branch, Islamic Azad University, Ardabil, Iran
| | - Hajar Sahebalzamani
- Department of Chemistry, Faculty of Science, Ardabil Branch, Islamic Azad University, Ardabil, Iran
| | - Masume Maleki
- Department of Chemistry, Faculty of Science, Ardabil Branch, Islamic Azad University, Ardabil, Iran
| | - Behrouz Notash
- Department of Chemistry, Shahid Beheshti University, G. C., Evin, Tehran 1983963113, Iran
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22
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Saeed S, Rashid N, Wong WT. 2,4-Dichloro-N-(1,3-thia-zol-2-yl)benzamide. Acta Crystallogr Sect E Struct Rep Online 2010; 66:o3078. [PMID: 21589387 PMCID: PMC3011524 DOI: 10.1107/s1600536810044193] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2010] [Accepted: 10/28/2010] [Indexed: 12/03/2022]
Abstract
In the molecular structure of the title compound, C10H6Cl2N2OS, the dihedral angle between the benzene plane and the plane defined by the amide functionality is 8.6 (1)°, while the thiazole ring plane is twisted with respect to the amide plane by 68.71 (5)°. In the crystal, pairs of intermolecular N—H⋯N hydrogen-bond interactions connect the molecules into inversion dimers. π–π interactions are also observed between neighbouring thiazole and phenyl rings [centroid–centroid distance = 3.5905 (13) Å] and a weak C—H⋯π interaction also occurs.
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23
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Ciufolini MA, Lefranc D. Micrococcin P1: Structure, biology and synthesis. Nat Prod Rep 2010; 27:330-42. [DOI: 10.1039/b919071f] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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25
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Dehydrative cyclization of serine, threonine, and cysteine residues catalyzed by molybdenum(VI) oxo compounds. Tetrahedron 2009. [DOI: 10.1016/j.tet.2008.12.074] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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26
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Gaumont AC, Gulea M, Levillain J. Overview of the Chemistry of 2-Thiazolines. Chem Rev 2009; 109:1371-401. [DOI: 10.1021/cr800189z] [Citation(s) in RCA: 134] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Annie-Claude Gaumont
- Laboratoire de Chimie Moléculaire et Thioorganique, UMR CNRS 6507, INC3M, FR 3038, ENSICAEN & Université de Caen, 14050 Caen, France
| | - Mihaela Gulea
- Laboratoire de Chimie Moléculaire et Thioorganique, UMR CNRS 6507, INC3M, FR 3038, ENSICAEN & Université de Caen, 14050 Caen, France
| | - Jocelyne Levillain
- Laboratoire de Chimie Moléculaire et Thioorganique, UMR CNRS 6507, INC3M, FR 3038, ENSICAEN & Université de Caen, 14050 Caen, France
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27
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Numajiri Y, Takahashi T, Doi T. Total Synthesis of (−)-Apratoxin A, 34-Epimer, and Its Oxazoline Analogue. Chem Asian J 2009; 4:111-25. [DOI: 10.1002/asia.200800365] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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28
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Petersson MJ, Jenkins ID, Loughlin WA. The use of phosphonium anhydrides for the synthesis of 2-oxazolines, 2-thiazolines and 2-dihydrooxazine under mild conditions. Org Biomol Chem 2009; 7:739-46. [DOI: 10.1039/b818310d] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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29
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Yunus U, Tahir MK, Bhatti MH, Wong WY. N-(Thia-zol-2-yl)acetamide. Acta Crystallogr Sect E Struct Rep Online 2008; 64:o1516. [PMID: 21203224 PMCID: PMC2962142 DOI: 10.1107/s1600536808021442] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2008] [Accepted: 07/10/2008] [Indexed: 11/15/2022]
Abstract
The title compound, C5H6N2OS, was synthesized from acetyl chloride and 2-aminothiazole in dry acetone. The asymmetric unit contains two molecules. The crystal structure is stabilized by N—H⋯N and C—H⋯O hydrogen bonds.
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30
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Wang X, Yang Q, Liu F, You Q. Microwave‐Assisted Synthesis of Amide under Solvent‐free Conditions. SYNTHETIC COMMUN 2008. [DOI: 10.1080/00397910701860372] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Xiao‐Jian Wang
- a Department of Medicinal Chemistry , China Pharmaceutical University , Nanjing, 210009, China
| | - Qian Yang
- a Department of Medicinal Chemistry , China Pharmaceutical University , Nanjing, 210009, China
| | - Fei Liu
- a Department of Medicinal Chemistry , China Pharmaceutical University , Nanjing, 210009, China
| | - Qi‐Dong You
- a Department of Medicinal Chemistry , China Pharmaceutical University , Nanjing, 210009, China
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31
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Hernández D, Riego E, Francesch A, Cuevas C, Albericio F, Álvarez M. Preparation of penta-azole containing cyclopeptides: challenges in macrocyclization. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.06.103] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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32
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Sakakura A, Kondo R, Umemura S, Ishihara K. Catalytic Synthesis of Peptide-Derived Thiazolines and Oxazolines using Bis(quinolinolato)dioxomolybdenum(VI) Complexes. Adv Synth Catal 2007. [DOI: 10.1002/adsc.200700068] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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33
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Sakakura A, Umemura S, Kondo R, Ishihara K. Dehydrative Cyclization Catalyzed by the Combination of Molybdenum(VI) Oxides and Benzoic Acids: First Synthesis of the Antitumour Substance BE-70016. Adv Synth Catal 2007. [DOI: 10.1002/adsc.200600550] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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34
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Ma D, Zou B, Cai G, Hu X, Liu JO. Total synthesis of the cyclodepsipeptide apratoxin A and its analogues and assessment of their biological activities. Chemistry 2007; 12:7615-26. [PMID: 16832801 DOI: 10.1002/chem.200600599] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
A novel total synthesis of apratoxin A is described, with key steps including the assembly of its ketide segment through a D-proline-catalyzed direct aldol reaction and Oppolzer's anti aldol reaction and the preparation of its thiazoline unit in a biomimetic synthesis. An oxazoline analogue of apratoxin A has also been elaborated by a similar approach. This compound has a potency against HeLa cell proliferation only slightly lower than that of apratoxin A, whilst a C(40)-demethylated oxazoline analogue of apratoxin A displays a much lower cytotoxicity and the C(37)-epimer and C(37) demethylation product of this new analogue are inactive. These results suggest that the two methyl groups at C(37) and C(40) and the stereochemistry at C(37) are essential for the potent cellular activity of the oxazoline analogue of apratoxin A. Further biological analysis revealed that both synthetic apratoxin A and its oxazoline analogue inhibited cell proliferation by causing cell cycle arrest in the G1 phase.
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Affiliation(s)
- Dawei Ma
- State Key Laboratory of Bioorganic and Natural Products Chemistry Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences 354 Fenglin Lu, Shanghai 200032, China.
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35
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Hernández D, Vilar G, Riego E, Cañedo LM, Cuevas C, Albericio F, Alvarez M. Synthesis of IB-01211, a Cyclic Peptide Containing 2,4-Concatenated Thia- and Oxazoles, via Hantzsch Macrocyclization. Org Lett 2007; 9:809-11. [PMID: 17266322 DOI: 10.1021/ol063023c] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[structure: see text] An efficient and versatile convergent synthesis of IB-01211 based on a combination of peptide and heterocyclic chemistry is described. The key step in the synthesis is macrocyclization through intramolecular Hantzsch formation of the thiazole ring. Dehydration of a free primary alcohol to furnish the exocyclic methylidene present in the natural product was applied during the macrocyclization.
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Affiliation(s)
- Delia Hernández
- Barcelona Science Park Josep Samitier 1-5, E-08028 Barcelona, Spain
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36
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Bur SK, Padwa A. The Synthesis of Heterocycles Using Cascade Chemistry. ADVANCES IN HETEROCYCLIC CHEMISTRY VOLUME 94 2007. [DOI: 10.1016/s0065-2725(06)94001-x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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37
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Lee CH, Yamamoto T. Synthesis of Liquid Crystals with Bent-Rod Structure: 4-Methylthiazole Derivatives with Nematic Phase. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587250108030012] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Chi-Han Lee
- a Chemical Resources Laboratory, Tokyo Institute of Technology , 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan
| | - Takakazu Yamamoto
- a Chemical Resources Laboratory, Tokyo Institute of Technology , 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan
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38
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Hamada Y, Shioiri T. Recent progress of the synthetic studies of biologically active marine cyclic peptides and depsipeptides. Chem Rev 2006; 105:4441-82. [PMID: 16351050 DOI: 10.1021/cr0406312] [Citation(s) in RCA: 218] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yasumasa Hamada
- Graduate School of Pharmaceutical Sciences, Chiba University, Yayoi-cho, Inage-ku, Japan.
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39
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40
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Xu Z, Ye T. Synthesis of 2,4,5-trisubstituted thiazoline via a novel stereoselective intramolecular conjugate addition. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.tetasy.2005.04.029] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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41
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Sakakura A, Kondo R, Ishihara K. Molybdenum Oxides as Highly Effective Dehydrative Cyclization Catalysts for the Synthesis of Oxazolines and Thiazolines. Org Lett 2005; 7:1971-4. [PMID: 15876032 DOI: 10.1021/ol050543j] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In the presence of molybdenum oxide the dehydrative cyclization of N-acylserines, N-acylthreonines, and N-acylcysteines can be carried out under Dean-Stark conditions in toluene to give oxazolines and thiazolines. The ammonium salts (NH(4))(6)Mo(7)O(24).4H(2)O and (NH(4))(2)MoO(4) have excellent catalytic activities for the dehydrative cyclization of serine and threonine derivatives, and the acetylacetonate complex MoO(2)(acac)(2) has a remarkable catalytic activity for the dehydrative cyclization of cysteine derivatives. In addition, polyaniline-supported MoO(2)(acac)(2) can easily be recovered and reused.
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Affiliation(s)
- Akira Sakakura
- Graduate School of Engineering, Nagoya University, Chikusa, Japan
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42
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44
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Yokokawa F, Sameshima H, Katagiri D, Aoyama T, Shioiri T. Total syntheses of lyngbyabellins A and B, potent cytotoxic lipopeptides from the marine cyanobacterium Lyngbya majuscula. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)01224-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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45
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Kline T, Andersen NH, Harwood EA, Bowman J, Malanda A, Endsley S, Erwin AL, Doyle M, Fong S, Harris AL, Mendelsohn B, Mdluli K, Raetz CRH, Stover CK, Witte PR, Yabannavar A, Zhu S. Potent, novel in vitro inhibitors of the Pseudomonas aeruginosa deacetylase LpxC. J Med Chem 2002; 45:3112-29. [PMID: 12086497 DOI: 10.1021/jm010579r] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Deacetylation of uridyldiphospho-3-O-(R-hydroxydecanoyl)-N-acetylglucosamine by LpxC is the first committed step in the Pseudomonas aeruginosa biosynthetic pathway to lipid A; homologous enzymes are found widely among Gram-negative bacteria. As an essential enzyme for which no inhibitors have yet been reported, the P. aeruginosa LpxC represents a highly attractive target for a novel antibacterial drug. We synthesized several focused small-molecule libraries, each composed of a variable aromatic ring, one of four heterocyclic/spacer moieties, and a hydroxamic acid and evaluated the LpxC inhibition of these compounds against purified P. aeruginosa enzyme. To ensure that the in vitro assay would be as physiologically relevant as possible, we synthesized a tritiated form of the specific P. aeruginosa glycolipid substrate and measured directly the enzymatically released acetate. Several of our novel compounds, predominantly those having fluorinated substituents on the aromatic ring and an oxazoline as the heterocyclic moiety, demonstrated in vitro IC(50) values less than 1 microM. We now report the synthesis and in vitro evaluation of these P. aeruginosa LpxC inhibitors.
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Affiliation(s)
- Toni Kline
- Chiron Corporation, 201 Elliot Avenue West, Seattle, WA 98119, USA.
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46
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Pfund E, Lequeux T, Masson S, Vazeux M. Synthesis of thiazolines linked to a difluoromethylphosphonate diester via dithioester chemistry. Org Lett 2002; 4:843-6. [PMID: 11869142 DOI: 10.1021/ol025544f] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] A two-step, high-yielding synthesis of delta(2)-thiazolines containing a difluoromethylphosphonate diester moiety has been devised using a building block approach. Racemic or chiral beta-amino alcohols and diols were coupled with methyl difluoro(diethoxyphosphono)dithioacetate to give predominantly the corresponding beta-hydroxythioamides, which were then cyclized to provide a series of novel substituted delta(2)-thiazolines.
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Affiliation(s)
- Emmanuel Pfund
- Laboratoire de Chimie Moléculaire et Thio-organique UMR CNRS 6507 ISMRA, UFR Sciences, Université de Caen, 6 Bd Maréchal Juin, 14050 Caen Cedex, France
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47
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H. Heathcock C, L. Kedrowski B. Thiazoline Ring Formation from 2- Methylcysteines and 2-Halomethylalanines. HETEROCYCLES 2002. [DOI: 10.3987/com-02-s(m)60] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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48
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Deoxo-Fluor-mediated cyclodehydration of β-hydroxy thioamides to the corresponding thiazolines. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)01759-2] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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49
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Emtenäs H, Alderin L, Almqvist F. An enantioselective ketene-imine cycloaddition method for synthesis of substituted ring-fused 2-pyridinones. J Org Chem 2001; 66:6756-61. [PMID: 11578231 DOI: 10.1021/jo015794u] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Previously, a method for the stereoselective synthesis of beta-lactams, starting from 2H-Delta(2)-thiazolines and Meldrum's acid derivatives, has been reported from our laboratory. We now report a new method for the synthesis of optically active, highly substituted ring-fused 2-pyridinones. This was discovered when 2-alkyl-Delta(2)-thiazolines and Meldrum's acid derivatives were treated with HCl(g) in benzene at 5 --> 78 degrees C. Further refinement of the synthetic protocol revealed that use of 1,2-dichloroethane as solvent at 0 --> 64 degrees C led to the desired 2-pyridinones in good yields and with excellent enantioselectivity. Use of these conditions allowed preparation of 2-pyridinones from several different Delta(2)-thiazolines and Meldrum's acid derivatives and may be a general route to 2-pyridinones.
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Affiliation(s)
- H Emtenäs
- Organic Chemistry, Department of Chemistry, Umeå University, SE-901 87 Umeå, Sweden
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50
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Yokokawa F, Sameshima H, Shioiri T. Total synthesis of lyngbyabellin A, a potent cytotoxic metabolite from the marine cyanobacterium Lyngbya majuscula. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)00678-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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