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Li W, Ricker R, Lok Chan K, Fung Lau P, Buchbinder NW, Krebs J, Friedrich A, Lin Z, Santos WL, Radius U, Marder TB. Phosphine-catalyzed 1,2-cis-diboration of 1,3-butadiynes. Chemistry 2024:e202401235. [PMID: 38593362 DOI: 10.1002/chem.202401235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Revised: 04/06/2024] [Accepted: 04/09/2024] [Indexed: 04/11/2024]
Abstract
Trialkyl phosphines PMe3 and PEt3 catalyze the 1,2-cis-diboration of 1,3-butadiynes to give 1,2-diboryl enynes. The products were utilized to synthesize 1,1,2,4-tetraaryl enynes using a Suzuki-Miyaura protocol and can readily undergo proto-deborylation.
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Affiliation(s)
- Weipeng Li
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China
- Institute of Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Würzburg, 97074, Germany
| | - Robert Ricker
- Institute of Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Würzburg, 97074, Germany
| | - Ka Lok Chan
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Pak Fung Lau
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | | | - Johannes Krebs
- Institute of Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Würzburg, 97074, Germany
| | - Alexandra Friedrich
- Institute of Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Würzburg, 97074, Germany
| | - Zhenyang Lin
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Webster L Santos
- Department of Chemistry Virginia Tech, Blacksburg, VA, 24061, USA
| | - Udo Radius
- Institute of Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Würzburg, 97074, Germany
| | - Todd B Marder
- Institute of Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Würzburg, 97074, Germany
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Campbell R, Buchbinder NW, Szwetkowski C, Zhu Y, Piedl K, Truong M, Matson JB, Santos WL, Mevers E. Design, Synthesis, and Antifungal Activity of 3-Substituted-2( 5H)-Oxaboroles. ACS Med Chem Lett 2024; 15:349-354. [PMID: 38505851 PMCID: PMC10945556 DOI: 10.1021/acsmedchemlett.3c00463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 02/12/2024] [Accepted: 02/14/2024] [Indexed: 03/21/2024] Open
Abstract
Next generation antimicrobial therapeutics are desperately needed as new pathogens with multiple resistance mechanisms continually emerge. Two oxaboroles, tavaborole and crisaborole, were recently approved as topical treatments for onychomycosis and atopic dermatitis, respectively, warranting further studies into this privileged structural class. Herein, we report the antimicrobial properties of 3-substituted-2(5H)-oxaboroles, an unstudied family of medicinally relevant oxaboroles. Our results revealed minimum inhibitory concentrations as low as 6.25 and 5.20 μg/mL against fungal (e.g., Penicillium chrysogenum) and yeast (Saccharomyces cerevisiae) pathogens, respectively. These oxaboroles were nonhemolytic and nontoxic to rat myoblast cells (H9c2). Structure-activity relationship studies suggest that planarity is important for antimicrobial activity, possibly due to the effects of extended conjugation between the oxaborole and benzene rings.
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Affiliation(s)
- Rose Campbell
- Department
of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | | | - Connor Szwetkowski
- Department
of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Yumeng Zhu
- Department
of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Karla Piedl
- Department
of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Mindy Truong
- Department
of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - John B. Matson
- Department
of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Webster L. Santos
- Department
of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Emily Mevers
- Department
of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
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Burgio AL, Buchbinder NW, Santos WL. Regio- and Stereoselective Copper-Catalyzed Borylation-Protodeboronation of 1,3-Diynes: Access to ( Z)-1,3-Enynes. Org Lett 2023; 25:2652-2656. [PMID: 37023099 DOI: 10.1021/acs.orglett.3c00711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2023]
Abstract
A facile method to access (Z)-1,3-enynes is realized via sequential copper-catalyzed regio- and stereoselective borylation-protodeboronation of 1,3-diynes. Pinacolborane, copper(II) acetate, and Xantphos as the ligand efficiently install hydrogen and Bpin in a cis fashion, which is followed by rapid hydrolysis with water. The reaction has wide substrate scope and occurs in a chemoselective fashion.
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Affiliation(s)
- Ariel L Burgio
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Nicklas W Buchbinder
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Webster L Santos
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
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Sharma S, Buchbinder NW, Braje WM, Handa S. Fast Amide Couplings in Water: Extraction, Column Chromatography, and Crystallization Not Required. Org Lett 2020; 22:5737-5740. [PMID: 32574062 DOI: 10.1021/acs.orglett.0c01676] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
In the micelle of PS-750-M, the presence of 3° amides from the surfactant proline linker mimics dimethylformamide, dimethylacetamide, and N-methyl-2-pyrrolidone. The resultant micellar properties enable extremely fast amide couplings mediated by 1-ethyl-3-(3-(dimethylamino)propyl)carbodiimide (without hydroxybenzotriazole), rather than expensive and specialized coupling agents. Conditions have been developed wherein products precipitate, and isolation by filtration completely avoids the use of organic solvent. This methodology is scalable and avoids product epimerization.
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Affiliation(s)
- Sudripet Sharma
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
| | - Nicklas W Buchbinder
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
| | - Wilfried M Braje
- Neuroscience Discovery Research, AbbVie Deutschland GmbH & Co. KG, Ludwigshafen, Germany
| | - Sachin Handa
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
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