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Kaplan JA, Issaian A, Stang M, Gorial D, Blum SA. Repurposing π Electrophilic Cyclization/Dealkylation for Group Transfer. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202112351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Joseph A. Kaplan
- Department of Chemistry University of California, Irvine Irvine CA 02697 USA
| | - Adena Issaian
- Department of Chemistry University of California, Irvine Irvine CA 02697 USA
| | - Martin Stang
- Department of Chemistry University of California, Irvine Irvine CA 02697 USA
| | - David Gorial
- Department of Chemistry University of California, Irvine Irvine CA 02697 USA
| | - Suzanne A. Blum
- Department of Chemistry University of California, Irvine Irvine CA 02697 USA
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2
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Kaplan JA, Issaian A, Stang M, Gorial D, Blum SA. Repurposing π Electrophilic Cyclization/Dealkylation for Group Transfer. Angew Chem Int Ed Engl 2021; 60:25776-25780. [PMID: 34585500 DOI: 10.1002/anie.202112351] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Indexed: 01/31/2023]
Abstract
A metal-free regio- and stereocontrolled group-transfer route toward the synthesis of trisubstituted alkenes is described. In this route, an electrophilic heterocyclization is followed by ring-opening group transfer. Specifically, a thioboration reaction transforms readily available alkynyl sulfide precursors into alkenyl boronates and alkenyl sulfides with defined regio- and stereochemistry in one synthetic step using commercially available B-chlorocatecholborane (ClBcat). Mechanistic studies identified the likely pathway as proceeding through zwitterionic rather than haloborated intermediates. The regio- and stereochemistry set in the initial cyclization step is preserved in the final acyclic alkene product, producing alkenes with up to four modifiable substituents with predictable regio- and stereochemistry. Downstream functionalization reactions showcase the versatility of the substitutions of the resulting alkenes. The mechanistic concept maps onto future reaction designs, given the abundance of known electrophiles and nucleophiles for electrophilic heterocyclization/dealkylation sequences.
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Affiliation(s)
- Joseph A Kaplan
- Department of Chemistry, University of California, Irvine, Irvine, CA, 02697, USA
| | - Adena Issaian
- Department of Chemistry, University of California, Irvine, Irvine, CA, 02697, USA
| | - Martin Stang
- Department of Chemistry, University of California, Irvine, Irvine, CA, 02697, USA
| | - David Gorial
- Department of Chemistry, University of California, Irvine, Irvine, CA, 02697, USA
| | - Suzanne A Blum
- Department of Chemistry, University of California, Irvine, Irvine, CA, 02697, USA
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3
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Hama AK, Algso MAS, Kavak E, Kivrak A. Synthesis of Novel Benzothiophene Derivatives via Cyclization Reactions. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2020. [DOI: 10.1134/s1070428020070222] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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4
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Aggarwal S, Srinivas D, Sreenivasulu C, Satyanarayana G. Nickel catalyzed intramolecular oxidative coupling: synthesis of 3-aryl benzofurans. RSC Adv 2020; 10:22264-22272. [PMID: 35516592 PMCID: PMC9054549 DOI: 10.1039/d0ra03071f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Accepted: 05/27/2020] [Indexed: 11/21/2022] Open
Abstract
Recent research has been focused on the transition metal-catalyzed reactions. Herein we have developed nickel-catalyzed synthesis of 3-aryl benzofurans from ortho-alkenyl phenols via intramolecular dehydrogenative coupling. Notably, simple O2 gas served as an oxidant, without using any sacrificial hydrogen acceptor. The strategy enabled the synthesis of 3-aryl benzofurans in good to excellent yields.
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Affiliation(s)
- Sakshi Aggarwal
- Department of Chemistry, Indian Institute of Technology Kandi, Sangareddy Hyderabad 502 285 Telangana India +91 40 2301 6003/32 +91 40 2301 6033
| | - Dasari Srinivas
- Department of Chemistry, Indian Institute of Technology Kandi, Sangareddy Hyderabad 502 285 Telangana India +91 40 2301 6003/32 +91 40 2301 6033
| | - Chinnabattigalla Sreenivasulu
- Department of Chemistry, Indian Institute of Technology Kandi, Sangareddy Hyderabad 502 285 Telangana India +91 40 2301 6003/32 +91 40 2301 6033
| | - Gedu Satyanarayana
- Department of Chemistry, Indian Institute of Technology Kandi, Sangareddy Hyderabad 502 285 Telangana India +91 40 2301 6003/32 +91 40 2301 6033
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5
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Panda N, Mattan I, Ojha S, Purohit CS. Synthesis of medium-sized (6-7-6) ring compounds by iron-catalyzed C-H activation/annulation [corrected]. Org Biomol Chem 2018; 16:7861-7870. [PMID: 30303228 DOI: 10.1039/c8ob01496e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this report, we have described a FeCl3-catalyzed process involving intramolecular annulation of o-phenoxy diarylacetylenes via hydroarylation to afford a series of biologically potent fused seven-membered (6-7-6) ring compounds under mild reaction conditions. This reaction was believed to proceed through Friedel-Crafts type sequential carbometallation followed by protonation to produce phenyldibenz[b,f]oxepines. This method was also extended to synthesize seven-membered rings that are fused with coumarins.
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Affiliation(s)
- Niranjan Panda
- Department of Chemistry, National Institute of Technology, Rourkela, Odisha-769008, India.
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Ezzatzadeh E, Hossaini Z. Green synthesis and antioxidant activity of novel series of benzofurans from euparin extracted of Petasites hybridus. Nat Prod Res 2018; 33:1617-1623. [PMID: 29376428 DOI: 10.1080/14786419.2018.1428598] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A novel class of benzofuran derivatives is prepared from the isocyanide-based MCR, euparin and aldehydes in the presence of ZnO-nanorods as a catalyst in excellent yields at room temperature under solvent-free conditions as a green reaction medium. Also, the antioxidant activities of some synthesised compounds such as 4a, 4b, 10a and 10b were evaluated by DPPH radical scavenging and ferric reduction activity potential (FRAP) assays. Compound 10b, was shown moderate radical scavenging activity and very good reducing activity compared to standards (BHT and TBHQ).
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Affiliation(s)
- Elham Ezzatzadeh
- a Department of Chemistry, Ardabil Branch , Islamic Azad University , Ardabil , Iran
| | - Zinatossadat Hossaini
- b Department of Chemistry, Qaemshahr Branch , Islamic Azad University , Qaemshahr , Iran
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7
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Zou W, Huang Z, Jiang K, Wu Y, Xue Y, Suzenet F, Sun Q, Guillaumet G. Chelation-assisted C-S activation/cascade heteroannulation of pyridine-2-thione derivatives in Pd-catalyzed cross-coupling reaction with alkynes. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.07.026] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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8
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Zhang ZY. Drugging the Undruggable: Therapeutic Potential of Targeting Protein Tyrosine Phosphatases. Acc Chem Res 2017; 50:122-129. [PMID: 27977138 DOI: 10.1021/acs.accounts.6b00537] [Citation(s) in RCA: 116] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Protein tyrosine phosphatases (PTPs) are essential signaling enzymes that, together with protein tyrosine kinases, regulate tyrosine phosphorylation inside the cell. Proper level of tyrosine phosphorylation is important for a diverse array of cellular processes, such as proliferation, metabolism, motility, and survival. Aberrant tyrosine phosphorylation, resulting from alteration of PTP expression, misregulation, and mutation, has been linked to the etiology of many human ailments including cancer, diabetes/obesity, autoimmune disorders, and infectious diseases. However, despite the fact that PTPs have been garnering attention as compelling drug targets, they remain a largely underexploited resource for therapeutic intervention. Indeed, PTPs have been widely dismissed as "undruggable", due to concerns that (1) the highly conserved active site (i.e., pTyr-binding pocket) makes it difficult to achieve inhibitor selectivity among closely related family members, and (2) the positive-charged active site prefers negatively charged molecules, which usually lack cell permeability. To address the issue of selectivity, we advanced a novel paradigm for the acquisition of highly potent and selective PTP inhibitors through generation of bivalent ligands that interact with both PTP active site and adjacent unique peripheral pockets. To overcome the bioavailability issue, we have identified nonhydrolyzable pTyr mimetics that are sufficiently polar to bind the PTP active site, yet still capable of efficiently penetrating cell membranes. We show that these pTyr mimetics interact in the desired inhibitory fashion with the PTP active site and tethering them to appropriate molecular fragments to engage less conserved interactions outside of PTP active site can increase PTP inhibitor potency and selectivity. We demonstrate through three pTyr mimetics fragment-based approaches that it is completely feasible to obtain highly potent and selective PTP inhibitors with robust in vivo efficacy in animal models of oncology, diabetes/obesity, autoimmune disorders, and tuberculosis. We hope that these results will help dispel concerns about the druggability of PTPs and entice further effort in fostering a PTP-based drug discovery enterprise. Well-characterized, potent, selective and bioactive inhibitors are essential tools for functional interrogation of PTPs in disease biology and target validation. They will also play a critical role in illuminating the druggability of PTPs and provide the groundwork for new therapies for the treatment of human diseases.
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Affiliation(s)
- Zhong-Yin Zhang
- Department of Medicinal Chemistry
and Molecular Pharmacology, Department of Chemistry, Center for Cancer
Research, and Institute for Drug Discovery, Purdue University, 720
Clinic Drive, West Lafayette, Indiana 47907, United States
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9
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Heravi M, Zadsirjan V, Hamidi H, Tabar Amiri PH. Total synthesis of natural products containing benzofuran rings. RSC Adv 2017. [DOI: 10.1039/c7ra03551a] [Citation(s) in RCA: 101] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
In this review, various approaches for the construction of benzofurans as an important moiety in different natural products during the total synthesis of the natural of products are underscored.
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Affiliation(s)
- Majid M. Heravi
- Department of Chemistry
- School of Sciences
- Alzahra University
- Tehran
- Iran
| | - Vahideh Zadsirjan
- Department of Chemistry
- School of Sciences
- Alzahra University
- Tehran
- Iran
| | - Hoda Hamidi
- Department of Chemistry
- School of Sciences
- Alzahra University
- Tehran
- Iran
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10
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Rao MLN, Talode JB, Murty VN. Rapid regio- and multi-coupling reactivity of 2,3-dibromobenzofurans with atom-economic triarylbismuths under palladium catalysis. Beilstein J Org Chem 2016; 12:2065-2076. [PMID: 27829912 PMCID: PMC5082443 DOI: 10.3762/bjoc.12.195] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Accepted: 08/25/2016] [Indexed: 12/23/2022] Open
Abstract
A regio- and chemoselective cross-coupling study using 2,3-dibromobenzofurans and 2,3,5-tribromobenzofuran was achieved with sub-stoichiometric loadings of triarylbismuths as atom-economic reagents under Pd-catalyzed conditions. As part of this study, various 2,3-diaryl- and 2,3,5-triarylbenzofuran products were obtained in high yields, involving one-pot operations and short reaction times.
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Affiliation(s)
- Maddali L N Rao
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, U.P., India, Tel/ Fax: +91-512-2597532
| | - Jalindar B Talode
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, U.P., India, Tel/ Fax: +91-512-2597532
| | - Venneti N Murty
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, U.P., India, Tel/ Fax: +91-512-2597532
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11
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A microwave-assisted multicomponent protocol for the synthesis of benzofuran-2-carboxamides. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.02.068] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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12
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He S, Jain P, Lin B, Ferrer M, Hu Z, Southall N, Hu X, Zheng W, Neuenswander B, Cho CH, Chen Y, Worlikar SA, Aubé J, Larock RC, Schoenen FJ, Marugan JJ, Liang TJ, Frankowski KJ. High-Throughput Screening, Discovery, and Optimization To Develop a Benzofuran Class of Hepatitis C Virus Inhibitors. ACS COMBINATORIAL SCIENCE 2015; 17:641-52. [PMID: 26332742 DOI: 10.1021/acscombsci.5b00101] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Using a high-throughput, cell-based HCV luciferase reporter assay to screen a diverse small-molecule compound collection (∼ 300,000 compounds), we identified a benzofuran compound class of HCV inhibitors. The optimization of the benzofuran scaffold led to the identification of several exemplars with potent inhibition (EC50 < 100 nM) of HCV, low cytotoxicity (CC50 > 25 μM), and excellent selectivity (selective index = CC50/EC50, > 371-fold). The structure-activity studies culminated in the design and synthesis of a 45-compound library to comprehensively explore the anti-HCV activity. The identification, design, synthesis, and biological characterization for this benzofuran series is discussed.
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Affiliation(s)
- Shanshan He
- Liver
Diseases Branch, National Institute of Diabetes and Digestive and
Kidney Diseases, National Institutes of Health, 10 Center Drive, Bethesda, Maryland 20892, United States
| | | | - Billy Lin
- Liver
Diseases Branch, National Institute of Diabetes and Digestive and
Kidney Diseases, National Institutes of Health, 10 Center Drive, Bethesda, Maryland 20892, United States
| | - Marc Ferrer
- NIH
Chemical Genomics Center, Division of Preclinical Innovation, National
Center for Advancing Translational Sciences, National Institutes of Health, 9800 Medical Center Drive, Rockville, Maryland 20850, United States
| | - Zongyi Hu
- Liver
Diseases Branch, National Institute of Diabetes and Digestive and
Kidney Diseases, National Institutes of Health, 10 Center Drive, Bethesda, Maryland 20892, United States
| | - Noel Southall
- NIH
Chemical Genomics Center, Division of Preclinical Innovation, National
Center for Advancing Translational Sciences, National Institutes of Health, 9800 Medical Center Drive, Rockville, Maryland 20850, United States
| | - Xin Hu
- NIH
Chemical Genomics Center, Division of Preclinical Innovation, National
Center for Advancing Translational Sciences, National Institutes of Health, 9800 Medical Center Drive, Rockville, Maryland 20850, United States
| | - Wei Zheng
- NIH
Chemical Genomics Center, Division of Preclinical Innovation, National
Center for Advancing Translational Sciences, National Institutes of Health, 9800 Medical Center Drive, Rockville, Maryland 20850, United States
| | | | | | | | | | | | | | | | - Juan J. Marugan
- NIH
Chemical Genomics Center, Division of Preclinical Innovation, National
Center for Advancing Translational Sciences, National Institutes of Health, 9800 Medical Center Drive, Rockville, Maryland 20850, United States
| | - T. Jake Liang
- Liver
Diseases Branch, National Institute of Diabetes and Digestive and
Kidney Diseases, National Institutes of Health, 10 Center Drive, Bethesda, Maryland 20892, United States
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13
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Chemo-enzymatic synthesis of new resveratrol-related dimers containing the benzo[b]furan framework and evaluation of their radical scavenger activities. Tetrahedron 2015. [DOI: 10.1016/j.tet.2014.11.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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14
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Jasselin-Hinschberger A, Comoy C, Chartoire A, Fort Y. Elaboration of Furopyridine Scaffolds. European J Org Chem 2015. [DOI: 10.1002/ejoc.201403412] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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15
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Li Y, Cheng L, Liu X, Li B, Sun N. Copper-promoted hydration and annulation of 2-fluorophenylacetylene derivatives: from alkynes to benzo[b]furans and benzo[b]thiophenes. Beilstein J Org Chem 2015; 10:2886-91. [PMID: 25550754 PMCID: PMC4273265 DOI: 10.3762/bjoc.10.305] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Accepted: 11/20/2014] [Indexed: 01/03/2023] Open
Abstract
An efficient copper-promoted hydration reaction and its application in the synthesis of benzo[b]furan and benzo[b]thiophene derivatives is presented starting from readily available 2-fluorophenylacetylene derivatives. The key annulation step involves the hydration of the C-F bond of 2-fluorophenylacetylene derivatives followed by an intramolecular annulation to afford benzo[b]furan and benzo[b]thiophene derivatives. Moreover, structurally important 2,2'-bisbenzofuran scaffolds are provided in good yields.
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Affiliation(s)
- Yibiao Li
- School of Chemical & Environmental Engineering, Wuyi University, Jiangmen, Guangdong Province, 529090, China
| | - Liang Cheng
- School of Chemical & Environmental Engineering, Wuyi University, Jiangmen, Guangdong Province, 529090, China
| | - Xiaohang Liu
- BASF Catalyst, 23800 Mercantile Road, Beachwood, Ohio 44124, USA
| | - Bin Li
- School of Chemical & Environmental Engineering, Wuyi University, Jiangmen, Guangdong Province, 529090, China
| | - Ning Sun
- School of Chemical & Environmental Engineering, Wuyi University, Jiangmen, Guangdong Province, 529090, China
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17
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Okitsu T, Nakata K, Nishigaki K, Michioka N, Karatani M, Wada A. Iodocyclization of Ethoxyethyl Ethers to Ynamides: An Immediate Construction to Benzo[b]furans. J Org Chem 2014; 79:5914-20. [DOI: 10.1021/jo500903y] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Takashi Okitsu
- Department of Organic Chemistry
for Life Science, Kobe Pharmaceutical University, 4-19-1, Motoyamakita-machi, Higashinada-ku, Kobe 658-8558, Japan
| | - Kohei Nakata
- Department of Organic Chemistry
for Life Science, Kobe Pharmaceutical University, 4-19-1, Motoyamakita-machi, Higashinada-ku, Kobe 658-8558, Japan
| | - Kenji Nishigaki
- Department of Organic Chemistry
for Life Science, Kobe Pharmaceutical University, 4-19-1, Motoyamakita-machi, Higashinada-ku, Kobe 658-8558, Japan
| | - Naoyuki Michioka
- Department of Organic Chemistry
for Life Science, Kobe Pharmaceutical University, 4-19-1, Motoyamakita-machi, Higashinada-ku, Kobe 658-8558, Japan
| | - Mitsuaki Karatani
- Department of Organic Chemistry
for Life Science, Kobe Pharmaceutical University, 4-19-1, Motoyamakita-machi, Higashinada-ku, Kobe 658-8558, Japan
| | - Akimori Wada
- Department of Organic Chemistry
for Life Science, Kobe Pharmaceutical University, 4-19-1, Motoyamakita-machi, Higashinada-ku, Kobe 658-8558, Japan
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18
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Li L, Li S, Zhao C, Xu C. Synthesis, Photophysical Properties, and Self‐Organization of Difurobenzosilole Derivatives. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201400061] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Liangchun Li
- Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China, http://chxu.iccas.ac.cn
| | - Shuhong Li
- School of Science, Beijing Technology and Business University, Beijing 100048, P. R. China, http://lxy.btbu.edu.cn
| | - Cui‐Hua Zhao
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, P. R. China
| | - Caihong Xu
- Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China, http://chxu.iccas.ac.cn
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19
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Yamaguchi M, Katsumata H, Manabe K. One-Pot Synthesis of Substituted Benzo[b]furans from Mono- and Dichlorophenols Using Palladium Catalysts Bearing Dihydroxyterphenylphosphine. J Org Chem 2013; 78:9270-81. [DOI: 10.1021/jo401503t] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Miyuki Yamaguchi
- School
of Pharmaceutical
Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Haruka Katsumata
- School
of Pharmaceutical
Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Kei Manabe
- School
of Pharmaceutical
Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
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20
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Kommagalla Y, Srinivas K, Ramana C. Target cum flexibility: simple access to benzofuran conjugated sugar and nucleoside derivatives. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.01.089] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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21
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Painter TO, Bunn JR, Schoenen FJ, Douglas JT, Day VW, Santini C. Skeletal diversification via heteroatom linkage control: preparation of bicyclic and spirocyclic scaffolds from N-substituted homopropargyl alcohols. J Org Chem 2013; 78:3720-30. [PMID: 23510238 DOI: 10.1021/jo400077m] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The discovery and application of a new branching pathway synthesis strategy that rapidly produces skeletally diverse scaffolds is described. Two different scaffold types, one a bicyclic iodo-vinylidene tertiary amine/tertiary alcohol and the other, a spirocyclic 3-furanone, are each obtained using a two-step sequence featuring a common first step. Both scaffold types lead to intermediates that can be orthogonally diversified using the same final components. One of the scaffold types was obtained in sufficiently high yield that it was immediately used to produce a 97-compound library.
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Affiliation(s)
- Thomas O Painter
- Center for Chemical Methodologies and Library Development, The University of Kansas, 2034 Becker Drive, Lawrence, Kansas 66047, USA
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22
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Kong Y, Jiang K, Cao J, Fu L, Yu L, Lai G, Cui Y, Hu Z, Wang G. Synthesis of 3-Alkyl- or 3-Allenyl-2-amidobenzofurans via Electrophilic Cyclization of o-Anisole-Substituted Ynamides with Carbocations. Org Lett 2013; 15:422-5. [DOI: 10.1021/ol303474a] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Yulong Kong
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Wenyi Road 222, Hangzhou 310012, People’s Republic of China
| | - Kezhi Jiang
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Wenyi Road 222, Hangzhou 310012, People’s Republic of China
| | - Jian Cao
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Wenyi Road 222, Hangzhou 310012, People’s Republic of China
| | - Lingzi Fu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Wenyi Road 222, Hangzhou 310012, People’s Republic of China
| | - Lian Yu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Wenyi Road 222, Hangzhou 310012, People’s Republic of China
| | - Guoqiao Lai
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Wenyi Road 222, Hangzhou 310012, People’s Republic of China
| | - Yuming Cui
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Wenyi Road 222, Hangzhou 310012, People’s Republic of China
| | - Ziqiang Hu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Wenyi Road 222, Hangzhou 310012, People’s Republic of China
| | - Guanhai Wang
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Wenyi Road 222, Hangzhou 310012, People’s Republic of China
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Shukla SP, Tiwari RK, Verma AK. Palladium-Catalyzed Sonogashira-Coupling Conjoined C–H Activation: A Regioselective Tandem Strategy to Access Indolo- and Pyrrolo[1,2-a]quinolines. J Org Chem 2012; 77:10382-92. [DOI: 10.1021/jo302112a] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Satya Prakash Shukla
- Synthetic
Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi, 110007, India
| | - Rakesh K. Tiwari
- Synthetic
Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi, 110007, India
- Department of Biomedical & Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, Rhode Island, United States
| | - Akhilesh K. Verma
- Synthetic
Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi, 110007, India
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25
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Aggarwal T, Kumar S, Dhaked DK, Tiwari RK, Bharatam PV, Verma AK. Site-Selective Electrophilic Cyclization and Subsequent Ring-Opening: A Synthetic Route to Pyrrolo[1,2-a]quinolines and Indolizines. J Org Chem 2012; 77:8562-73. [DOI: 10.1021/jo3015374] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Trapti Aggarwal
- Synthetic
Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi, 110007, India
| | - Sonu Kumar
- Synthetic
Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi, 110007, India
| | | | - Rakesh K. Tiwari
- Synthetic
Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi, 110007, India
- Department of Biomedical & Pharmaceutical Sciences, University of Rhode Island, Kingston, Rhode Island, United States
| | | | - Akhilesh K. Verma
- Synthetic
Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi, 110007, India
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26
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Cho CH, Shi F, Jung DI, Neuenswander B, Lushington GH, Larock RC. Solution-phase synthesis of a highly substituted furan library. ACS COMBINATORIAL SCIENCE 2012; 14:403-14. [PMID: 22612549 DOI: 10.1021/co300040q] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A library of furans has been synthesized by iodocyclization and further diversified by palladium-catalyzed coupling processes. The key intermediate 3-iodofurans have been prepared by the electrophilic iodocyclization of 2-iodo-2-alken-1-ones in the presence of various nucleophiles in good to excellent yields under mild reaction conditions. These 3-iodofurans are the key components for library generation through subsequent elaboration by palladium-catalyzed processes, such as Suzuki-Miyaura, Sonagashira, Heck, aminocarbonylation, and carboalkoxylation chemistry to afford a diverse set of 2,3,4,5-tetrasubstituted furans.
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Affiliation(s)
- Chul-Hee Cho
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Feng Shi
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Dai-Il Jung
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- Department of Chemistry, Dong-A University, Saha-Gu, Busan 604-714, Korea
| | - Benjamin Neuenswander
- NIH Center of Excellence in Chemical Methodologies and Library Development, University of Kansas, Lawrence, Kansas 66047, United States
| | - Gerald H. Lushington
- NIH Center of Excellence in Chemical Methodologies and Library Development, University of Kansas, Lawrence, Kansas 66047, United States
| | - Richard C. Larock
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
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27
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Li E, Yao W, Xie X, Wang C, Shao Y, Li Y. Gold-catalyzed efficient synthesis of 2,4-disubstituted furans from aryloxy-enynes. Org Biomol Chem 2012; 10:2960-5. [DOI: 10.1039/c2ob07173h] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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28
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He Y, Zeng LF, Yu ZH, He R, Liu S, Zhang ZY. Bicyclic benzofuran and indole-based salicylic acids as protein tyrosine phosphatase inhibitors. Bioorg Med Chem 2011; 20:1940-6. [PMID: 22133902 DOI: 10.1016/j.bmc.2011.11.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2011] [Revised: 10/26/2011] [Accepted: 11/02/2011] [Indexed: 12/30/2022]
Abstract
Protein tyrosine phosphatases (PTPs) constitute a large and structurally diverse family of signaling enzymes that control the cellular levels of protein tyrosine phosphorylation. Malfunction of PTP activity has significant implications in many human diseases, and the PTP protein family provides an exciting array of validated diabetes/obesity (PTP1B), oncology (SHP2), autoimmunity (Lyp), and infectious disease (mPTPB) targets. However, despite the fact that PTPs have been garnering attention as novel therapeutic targets, they remain largely an untapped resource. The main challenges facing drug developers by the PTPs are inhibitor specificity and bioavailability. Work over the last ten years has demonstrated that it is feasible to develop potent and selective inhibitors for individual members of the PTP family by tethering together small ligands that can simultaneously occupy both the active site and unique nearby peripheral binding sites. Recent results with the bicyclic salicylic acid pharmacophores indicate that the new chemistry platform may provide a potential solution to overcome the bioavailability issue that has plagued the PTP drug discovery field for many years. Structural analysis of PTP-inhibitor complexes reveals molecular determinants important for the development of more potent and selective PTP inhibitors, thus offering hope in the medicinal chemistry of a largely unexploited protein class with a wealth of attractive drug targets.
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Affiliation(s)
- Yantao He
- Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, 635 Barnhill Drive, Indianapolis, IN 46202, USA
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29
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Fang Y, Wu C, Larock RC, Shi F. Synthesis of 2H-indazoles by the [3 + 2] dipolar cycloaddition of sydnones with arynes. J Org Chem 2011; 76:8840-51. [PMID: 21970468 PMCID: PMC3209955 DOI: 10.1021/jo201605v] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A rapid and efficient synthesis of 2H-indazoles has been developed using a [3 + 2] dipolar cycloaddition of sydnones and arynes. A series of 2H-indazoles have been prepared in good to excellent yields using this protocol, and subsequent Pd-catalyzed coupling reactions can be applied to the halogenated products to generate a structurally diverse library of indazoles.
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Affiliation(s)
- Yuesi Fang
- Department of Chemistry, Iowa State University, Ames, IA 50011, U.S.A
| | - Chunrui Wu
- Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Jinming Campus, Kaifeng, Henan 475004, China PR
| | - Richard C. Larock
- Department of Chemistry, Iowa State University, Ames, IA 50011, U.S.A
| | - Feng Shi
- Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Jinming Campus, Kaifeng, Henan 475004, China PR
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30
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Arcadi A, Blesi F, Cacchi S, Fabrizi G, Goggiamani A. 2,5,7-Trisubstituted benzo[b]furans through a copper- and/or palladium-catalyzed assembly and functionalization process. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.07.122] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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31
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Barancelli DA, Schumacher RF, Leite MR, Zeni G. Copper(II)-Mediated Intramolecular Cyclization of (Z)-Chalcogenoenynes: Synthesis of 3-Halochalcogenophene Derivatives. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100992] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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32
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Aggarwal T, Imam M, Kaushik NK, Chauhan VS, Verma AK. Pyrano[4,3-b]quinolines library generation via iodocyclization and palladium-catalyzed coupling reactions. ACS COMBINATORIAL SCIENCE 2011; 13:530-6. [PMID: 21793575 DOI: 10.1021/co200100z] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Synthesis of a 80-member library of novel pyrano[4,3-b]quinolines in solution-phase is reported. The key intermediate, 4-iodopyrano[4,3-b]quinolines were synthesized by the electrophilic iodocyclization of corresponding ortho-alkynyl aldehydes in good to excellent yields under mild reaction conditions. Subsequently a diverse set of libraries was generated by employing palladium-catalyzed Suzuki-Miyaura, Heck, and Sonogashira coupling reactions on 4-iodopyrano[4,3-b]quinolines. In this way, a series of structurally different and biologically interesting molecules were obtained. Some of the selected compounds were screened against 3D7 strains of Plasmodium falciparum for antimalarial activity. Suzuki coupling products 6{3} and 6{21} and Heck coupling product 8{12} exhibit promising antimalarial activity.
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Affiliation(s)
- Trapti Aggarwal
- Synthetic Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Maryam Imam
- Synthetic Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
- International Centre for Genetic Engineering and Biotechnology, New Delhi 110067, India
| | - Naveen K. Kaushik
- International Centre for Genetic Engineering and Biotechnology, New Delhi 110067, India
| | - Virander S. Chauhan
- International Centre for Genetic Engineering and Biotechnology, New Delhi 110067, India
| | - Akhilesh K. Verma
- Synthetic Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
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33
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Godoi B, Sperança A, Bruning CA, Back DF, Menezes PH, Nogueira CW, Zeni G. Iron(III) Chloride/Diorganyl Diselenides-Promoted Regioselective Cyclization of Alkynyl Aryl Ketones: Synthesis of 3-Organoselenyl Chromenones under Ambient Atmosphere. Adv Synth Catal 2011. [DOI: 10.1002/adsc.201100189] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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34
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Fischer J, Savage GP, Coster MJ. A Concise Route to Dihydrobenzo[b]furans: Formal Total Synthesis of (+)-Lithospermic Acid. Org Lett 2011; 13:3376-9. [DOI: 10.1021/ol201130h] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Joshua Fischer
- Eskitis Institute for Cell And Molecular Therapies, Griffith University, Nathan 4111 Queensland, Australia and CSIRO Materials Science and Engineering, Private Bag 10, Clayton 3169 Victoria, Australia
| | - G. Paul Savage
- Eskitis Institute for Cell And Molecular Therapies, Griffith University, Nathan 4111 Queensland, Australia and CSIRO Materials Science and Engineering, Private Bag 10, Clayton 3169 Victoria, Australia
| | - Mark J. Coster
- Eskitis Institute for Cell And Molecular Therapies, Griffith University, Nathan 4111 Queensland, Australia and CSIRO Materials Science and Engineering, Private Bag 10, Clayton 3169 Victoria, Australia
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35
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Markina NA, Mancuso R, Neuenswander B, Lushington GH, Larock RC. Solution-phase parallel synthesis of a diverse library of 1,2-dihydroisoquinolines. ACS COMBINATORIAL SCIENCE 2011; 13:265-71. [PMID: 21410207 DOI: 10.1021/co1000794] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Synthesis of a 105 membered library of 1,2-dihydroisoquinolines is described. The 1,2-dihydroisoquinoline compounds have been prepared in good yields using a Lewis acid and organocatalyst-cocatalyzed multicomponent reaction of 2-(1-alkynyl)benzaldehydes, amines, and ketones. Various indoles have also been employed as pronucleophiles, furnishing 1-(3-indolyl)-1,2-dihydroisoquinolines. The halogen functionality present in some of the synthesized compounds allows for further diversification by palladium-catalyzed Suzuki−Miyaura and Sonogashira cross-couplings to give more diversified 1,2-dihydroisoquinoline derivatives.
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Affiliation(s)
- Nataliya A. Markina
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Raffaella Mancuso
- Dipartimento di Chimica, Università della Calabria, 87036 Arcavacata di Rende (CS), Italy
| | - Benjamin Neuenswander
- NIH Center of Excellence in Chemical Methodologies and Library Development, University of Kansas, Lawrence, Kansas 66047, United States
| | - Gerald H. Lushington
- NIH Center of Excellence in Chemical Methodologies and Library Development, University of Kansas, Lawrence, Kansas 66047, United States
| | - Richard C. Larock
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
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36
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Cho CH, Larock RC. Highly substituted lactone/ester-containing furan library by the palladium-catalyzed carbonylation of hydroxyl-substituted 3-iodofurans. ACS COMBINATORIAL SCIENCE 2011; 13:272-9. [PMID: 21434604 PMCID: PMC3096464 DOI: 10.1021/co100088q] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Highly substituted lactone- and ester-containing furans have been prepared by the efficient palladium-catalyzed intramolecular cyclocarbonylation or intermolecular carboalkoxylation, respectively, of hydroxyl-containing 3-iodofurans, readily prepared by the iodocyclization of 2-(1-alkynyl)-2-alken-1-ones in the presence of various diols.
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Affiliation(s)
- Chul-Hee Cho
- Department of Chemistry, Iowa State University, Ames, Iowa 50011
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37
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Godoi B, Schumacher RF, Zeni G. Synthesis of heterocycles via electrophilic cyclization of alkynes containing heteroatom. Chem Rev 2011; 111:2937-80. [PMID: 21425870 DOI: 10.1021/cr100214d] [Citation(s) in RCA: 573] [Impact Index Per Article: 44.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Benhur Godoi
- Laboratório de Síntese, Reatividade, Avaliação Farmacológica e Toxicológica de Organocalcogênios, CCNE, UFSM, Santa Maria-Rio Grande do Sul, Brazil 97105-900
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38
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Carrër A, Florent JC, Auvrouin E, Rousselle P, Bertounesque E. Synthesis of 3-Aryl-2-arylamidobenzofurans Based on the Curtius Rearrangement. J Org Chem 2011; 76:2502-20. [DOI: 10.1021/jo102265b] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Amandine Carrër
- CNRS UMR 176, 26 rue d’Ulm, 75248 Paris, France
- Institut Curie, Centre de Recherche, 26 rue d’Ulm, 75248 Paris, France
| | - Jean-Claude Florent
- CNRS UMR 176, 26 rue d’Ulm, 75248 Paris, France
- Institut Curie, Centre de Recherche, 26 rue d’Ulm, 75248 Paris, France
| | | | - Patricia Rousselle
- Institut de Biologie et de Chimie des Protéines, CNRS UMR 5086, 7, passage du Vercors, 69367 Lyon, France
| | - Emmanuel Bertounesque
- CNRS UMR 176, 26 rue d’Ulm, 75248 Paris, France
- Institut Curie, Centre de Recherche, 26 rue d’Ulm, 75248 Paris, France
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39
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Chen Z, Huang G, Jiang H, Huang H, Pan X. Synthesis of 2,5-Disubstituted 3-Iodofurans via Palladium-Catalyzed Coupling and Iodocyclization of Terminal Alkynes. J Org Chem 2011; 76:1134-9. [DOI: 10.1021/jo1023987] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Zhengwang Chen
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Gao Huang
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Huanfeng Jiang
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Huawen Huang
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Xiaoyan Pan
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
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40
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Base-free NIS promoted electrophilic cyclization of alkynes: an efficient synthesis of iodo substituted pyrano[4,3-b]quinolines. Tetrahedron 2011. [DOI: 10.1016/j.tet.2010.10.081] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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41
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Raffa G, Belot S, Balme G, Monteiro N. Iodocyclization versus diiodination in the reaction of 3-alkynyl-4-methoxycoumarins with iodine: Synthesis of 3-iodofuro[2,3-b]chromones. Org Biomol Chem 2011; 9:1474-8. [DOI: 10.1039/c0ob00935k] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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42
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Gay RM, Manarin F, Schneider CC, Barancelli DA, Costa MD, Zeni G. FeCl(3)-Diorganyl dichalcogenides promoted cyclization of 2-alkynylanisoles to 3-chalcogen benzo[b]furans. J Org Chem 2010; 75:5701-6. [PMID: 20704440 DOI: 10.1021/jo101126q] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A general synthesis of 3-chalcogen benzo[b]furans from the readily available 2-alkynylanisoles, via FeCl(3)/diorganyl dichalcogenides intramolecular cyclization, has been developed. Aryl and alkyl groups directly bonded to the chalcogen atom were used as cycling agents. The results revealed that the reaction significantly depends on the electronic effects of substituents in the aromatic ring bonded to the selenium atom of the diselenide species. We observed that the pathway of reaction was not sensitive to the nature of substituents in the aromatic ring of anisole since both the electron-donating and the electron-withdrawing groups delivered the products in similar yields. In addition, the obtained heterocycles were readily transformed to more complex products by using a chalcogen/lithium exchange reaction with n-BuLi followed by trapping of the lithium intermediate with aldehydes, furnishing the desired secondary alcohols in good yields.
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Affiliation(s)
- Rafaela M Gay
- Laboratório de Síntese, Reatividade, Avaliação Farmacológica e Toxicológica de Organocalcogênios, CCNE, UFSM, Santa Maria-Rio Grande do Sul, Brazil 97105-900
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43
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Geary LM, Hultin PG. 2-Substituted Benzo[b]furans from (E)-1,2-Dichlorovinyl Ethers and Organoboron Reagents: Scope and Mechanistic Investigations into the One-Pot Suzuki Coupling/Direct Arylation. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000787] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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44
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Targeting mycobacterium protein tyrosine phosphatase B for antituberculosis agents. Proc Natl Acad Sci U S A 2010. [PMID: 20167798 DOI: 10.1073/pnas.0909133107.] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Protein tyrosine phosphatases are often exploited and subverted by pathogenic bacteria to cause human diseases. The tyrosine phosphatase mPTPB from Mycobacterium tuberculosis is an essential virulence factor that is secreted by the bacterium into the cytoplasm of macrophages, where it mediates mycobacterial survival in the host. Consequently, there is considerable interest in understanding the mechanism by which mPTPB evades the host immune responses, and in developing potent and selective mPTPB inhibitors as unique antituberculosis (antiTB) agents. We uncovered that mPTPB subverts the innate immune responses by blocking the ERK1/2 and p38 mediated IL-6 production and promoting host cell survival by activating the Akt pathway. We identified a potent and selective mPTPB inhibitor I-A09 with highly efficacious cellular activity, from a combinatorial library of bidentate benzofuran salicylic acid derivatives assembled by click chemistry. We demonstrated that inhibition of mPTPB with I-A09 in macrophages reverses the altered host immune responses induced by the bacterial phosphatase and prevents TB growth in host cells. The results provide the necessary proof-of-principle data to support the notion that specific inhibitors of the mPTPB may serve as effective antiTB therapeutics.
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45
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Cho CH, Neuenswander B, Larock RC. Diverse methyl sulfone-containing benzo[b]thiophene library via iodocyclization and palladium-catalyzed coupling. JOURNAL OF COMBINATORIAL CHEMISTRY 2010; 12:278-85. [PMID: 20055500 PMCID: PMC2834800 DOI: 10.1021/cc900172u] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Parallel solution-phase methods for the synthesis of a 72-membered benzo[b]thiophene library are reported. Medicinally interesting, drug-like, methyl sulfone-substituted benzo[b]thiophenes have been prepared by the palladium-catalyzed substitution of 3-iodobenzo[b]thiophenes by Suzuki-Miyaura, Sonogashira, Heck, carboalkoxylation, and aminocarbonylation chemistry. The key intermediates for library generation, methyl sulfone-containing 3-iodobenzo[b]thiophenes, are readily prepared by iodocyclization and oxidation methodologies from readily available alkynes.
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Affiliation(s)
- Chul-Hee Cho
- Department of Chemistry, Iowa State University, Ames, Iowa 50011
| | - Benjamin Neuenswander
- University of Kansas NIH Center of Excellence in Chemical Methodologies and Library Development, Lawrence, Kansas 66047
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46
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Targeting mycobacterium protein tyrosine phosphatase B for antituberculosis agents. Proc Natl Acad Sci U S A 2010; 107:4573-8. [PMID: 20167798 DOI: 10.1073/pnas.0909133107] [Citation(s) in RCA: 177] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Protein tyrosine phosphatases are often exploited and subverted by pathogenic bacteria to cause human diseases. The tyrosine phosphatase mPTPB from Mycobacterium tuberculosis is an essential virulence factor that is secreted by the bacterium into the cytoplasm of macrophages, where it mediates mycobacterial survival in the host. Consequently, there is considerable interest in understanding the mechanism by which mPTPB evades the host immune responses, and in developing potent and selective mPTPB inhibitors as unique antituberculosis (antiTB) agents. We uncovered that mPTPB subverts the innate immune responses by blocking the ERK1/2 and p38 mediated IL-6 production and promoting host cell survival by activating the Akt pathway. We identified a potent and selective mPTPB inhibitor I-A09 with highly efficacious cellular activity, from a combinatorial library of bidentate benzofuran salicylic acid derivatives assembled by click chemistry. We demonstrated that inhibition of mPTPB with I-A09 in macrophages reverses the altered host immune responses induced by the bacterial phosphatase and prevents TB growth in host cells. The results provide the necessary proof-of-principle data to support the notion that specific inhibitors of the mPTPB may serve as effective antiTB therapeutics.
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47
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Cho CH, Neuenswander B, Lushington GH, Larock RC. Solution-phase parallel synthesis of a multi-substituted benzo[b]thiophene library. ACTA ACUST UNITED AC 2009; 11:900-6. [PMID: 19569714 DOI: 10.1021/cc9000604] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Generation of a library using parallel syntheses of multi-substituted benzo[b]thiophenes is described. The requisite 3-iodobenzo[b]thiophenes are readily prepared in excellent yields from various alkynes bearing electron-rich aromatic rings by electrophilic cyclization using I(2) in CH(2)Cl(2). The heteroaromatic carbon-iodine bonds allow further diversification by palladium-catalyzed Suzuki-Miyaura, Sonogashira, Heck, and carboalkoxylation chemistry to give multi-substituted benzo[b]thiophene derivatives.
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Affiliation(s)
- Chul-Hee Cho
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA
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48
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Pd-Catalyzed Reactions of Allenylphosphonates and Related Allenes with Functionalized 2-Iodophenols, 2-Iodobenzoic Acid, and 2-Iodobenzyl Alcohol Leading to Functionalized Benzofurans, Isocoumarins, and Benzopyrans. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900865] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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49
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Kraus GA, Gupta V. A new synthetic strategy for the synthesis of bioactive stilbene dimers. A direct synthesis of amurensin H. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.10.040] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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50
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Roy S, Roy S, Neuenswander B, Hill D, Larock RC. Solution-phase synthesis of a diverse isocoumarin library. JOURNAL OF COMBINATORIAL CHEMISTRY 2009; 11:1128-35. [PMID: 19817453 PMCID: PMC2785110 DOI: 10.1021/cc9001197] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The solution-phase synthesis of a 167-member library of isocoumarins is described. The key intermediates for library generation, 4-iodoisocoumarins, are easily prepared by iodocyclization of the corresponding 2-(1-alkynyl)arenecarboxylate esters. The 4-iodoisocoumarins undergo palladium-catalyzed Sonogashira, Suzuki-Miyura, and Heck reactions to yield a diverse set of isocoumarins. Alternatively, isocoumarins, bearing hydroxyl or bromine functionalities, have been prepared by ZnCl(2)- and Pd(PPh(3))(4)-mediated cyclization of the corresponding o-iodobenzoic acid and appropriate terminal alkynes. The resulting isocoumarins were further diversified by derivatization of the hydroxyl or bromine groups. A small set of isoquinolinones were also prepared from the corresponding isocoumarins.
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Affiliation(s)
- Sujata Roy
- Department of Chemistry, Iowa State University, Ames, Iowa 50011
| | - Sudipta Roy
- Department of Chemistry, Iowa State University, Ames, Iowa 50011
| | - Benjamin Neuenswander
- The University of Kansas NIH Center of Excellence in Chemical Methodologies and Library Development, Lawrence, Kansas, 66047
| | - David Hill
- The University of Kansas NIH Center of Excellence in Chemical Methodologies and Library Development, Lawrence, Kansas, 66047
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