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Song L, Ma C, Huang J, Lv Y, Yue H, You J, Wei W, Yi D. Visible-Light Photoredox-Catalyzed Difunctionalization of Alkynes with Quinoxalin-2(1 H)-Ones, P 4S 10, and Alcohols. J Org Chem 2024; 89:10974-10986. [PMID: 39048291 DOI: 10.1021/acs.joc.4c01409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/27/2024]
Abstract
Visible-light photoredox-catalyzed method has been developed for the synthesis of quinoxalin-2(1H)-one-containing vinyl phosphorodithioates via direct difunctionalization of alkynes with quinoxalin-2(1H)-ones, P4S10 and alcohols. This four-component reaction could be carried out under metal-free and mild conditions, affording a number of quinoxalin-2(1H)-one-containing vinyl phosphorodithioates in moderate to good yields with Z-isomers as the major products. Photocatalytic radical mechanism is proposed based on the results of radical trapping and fluorescence quenching experiments.
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Affiliation(s)
- Lianhui Song
- Key Laboratory of Catalytic Conversion and Clean Energy in Universities of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, PR China
| | - Chao Ma
- Key Laboratory of Catalytic Conversion and Clean Energy in Universities of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, PR China
| | - Jian Huang
- Key Laboratory of Catalytic Conversion and Clean Energy in Universities of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, PR China
| | - Yufen Lv
- Key Laboratory of Catalytic Conversion and Clean Energy in Universities of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, PR China
| | - Huilan Yue
- Qinghai Provincial Key Laboratory of Tibetan Medicine Research and CAS Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, Qinghai 810008, PR China
| | - Jinmao You
- Key Laboratory of Catalytic Conversion and Clean Energy in Universities of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, PR China
- College of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing 312000, PR China
| | - Wei Wei
- Key Laboratory of Catalytic Conversion and Clean Energy in Universities of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, PR China
| | - Dong Yi
- Green Pharmaceutical Technology Key Laboratory of Luzhou City, School of Pharmacy, Southwest Medical University, Luzhou, Sichuan 646000, PR China
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Sarkar B, Hajra A. Hydro-phosphorothiolation of Styrene and Cyclopropane with S-Hydrogen Phosphorothioates under Ambient Conditions. Org Lett 2024; 26:5141-5145. [PMID: 38848455 DOI: 10.1021/acs.orglett.4c01586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2024]
Abstract
A metal-free hexafluoroisopropanol-mediated hydro-phosphorothiolation of styrenes and donor-acceptor cyclopropanes with S-hydrogen phosphorothioates in a Markovnikov fashion has been developed under ambient reaction conditions to afford a library of S-alkyl phosphorothioates. Notably, this strategy provides a simple and efficient way to produce biologically significant kitazin and iprobenfos derivatives. Mechanistic studies disclose that the reaction proceeds through a carbocation intermediate.
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Affiliation(s)
- Biswajit Sarkar
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Alakananda Hajra
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
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Chen XM, Huang J, Pan J, Xie Y, Zeng F, Wei W, Yi D. Construction of β-Oximino Phosphorodithioates via (2,2,6,6-Tetramethylpiperidin-1-yl)oxyl-Promoted Difunctionalization of Alkenes with tert-Butyl Nitrite, P 4S 10, and Alcohols. Org Lett 2024; 26:3883-3888. [PMID: 38683041 DOI: 10.1021/acs.orglett.4c01038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2024]
Abstract
A (2,2,6,6-tetramethylpiperidin-1-yl)oxyl-mediated difunctionalization of alkenes with tert-butyl nitrite, P4S10, and alcohols has been developed for the synthesis of β-oximino phosphorodithioates. The reaction goes through a radical pathway with the successive installation of phosphorodithioate and an oxime group. This four-component protocol offers a practical approach to constructing a variety of β-oximino phosphorodithioates in moderate to good yields with favorable functional group tolerance.
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Affiliation(s)
- Xiao-Ming Chen
- Department of Biology and Chemistry, Hunan University of Science and Engineering, Yongzhou, Hunan 425199, People's Republic of China
| | - Jian Huang
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, People's Republic of China
| | - Jun Pan
- Department of Biology and Chemistry, Hunan University of Science and Engineering, Yongzhou, Hunan 425199, People's Republic of China
| | - Yi Xie
- Department of Biology and Chemistry, Hunan University of Science and Engineering, Yongzhou, Hunan 425199, People's Republic of China
| | - Fei Zeng
- Department of Biology and Chemistry, Hunan University of Science and Engineering, Yongzhou, Hunan 425199, People's Republic of China
| | - Wei Wei
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, People's Republic of China
| | - Dong Yi
- Green Pharmaceutical Technology Key Laboratory of Luzhou City, School of Pharmacy, Southwest Medical University, Luzhou, Sichuan 646000, People's Republic of China
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Bao J, Kang KS, Molineux J, Bischoff DJ, Mackay ME, Pyun J, Njardarson JT. Dithiophosphoric Acids for Polymer Functionalization. Angew Chem Int Ed Engl 2024; 63:e202315963. [PMID: 38225715 DOI: 10.1002/anie.202315963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2023] [Indexed: 01/17/2024]
Abstract
Dithiophosphoric acids (DTPAs) are an intriguing class of compounds that are sourced from elemental sulfur and white phosphorus and are prepared from the reaction of phosphorus pentasulfide with alcohols. The electrophilic addition of DTPAs to alkenes and unsaturated olefinic substrates is a known reaction, but has not been applied to polymer synthesis and polymer functionalization. We report on the synthesis and application of DTPAs for the functionalization of challenging poly-enes, namely polyisoprene (PI) and polynorbornene (pNB) prepared by ring-opening metathesis polymerization (ROMP). The high heteroatom content within DTPA moieties impart intriguing bulk properties to poly-ene materials after direct electrophilic addition reactions to the polymer backbone introducing DTPAs as side chain groups. The resulting materials possess both enhanced optical and flame retardant properties vs the poly-ene starting materials. Finally, we demonstrate the ability to prepare crosslinked polydiene films with di-functional DTPAs, where the crosslinking density and thermomechanical properties can be directly tuned by DTPA feed ratios.
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Affiliation(s)
- Jianhua Bao
- Department of Chemistry and Biochemistry, The University of Arizona, Tucson, AZ 85721, USA
| | - Kyung-Seok Kang
- Department of Chemistry and Biochemistry, The University of Arizona, Tucson, AZ 85721, USA
| | - Jake Molineux
- Department of Chemistry and Biochemistry, The University of Arizona, Tucson, AZ 85721, USA
| | - Derek J Bischoff
- Department of Materials Science and Engineering, University of Delaware, Newark, DE 19716, USA
| | - Michael E Mackay
- Department of Materials Science and Engineering, University of Delaware, Newark, DE 19716, USA
| | - Jeffrey Pyun
- Department of Chemistry and Biochemistry, The University of Arizona, Tucson, AZ 85721, USA
| | - Jon T Njardarson
- Department of Chemistry and Biochemistry, The University of Arizona, Tucson, AZ 85721, USA
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