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Hédouin M, Barthelemy AL, Vanthuyne N, Besrour H, Maddaluno J, Magnier E, Oulyadi H. NMR and DFT Studies with a Doubly Labelled 15 N/ 6 Li S-Trifluoromethyl Sulfoximine Reveal Why a Directed ortho-Lithiation Requires an Excess of n-BuLi. Angew Chem Int Ed Engl 2023; 62:e202214106. [PMID: 36377763 PMCID: PMC10108270 DOI: 10.1002/anie.202214106] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2022] [Indexed: 11/16/2022]
Abstract
This work shows why it is imperious to use an excess of butyllithium for a directed ortho-lithiation of a trifluoromethyl sulfoximine. The analysis of mixtures of n-BuLi and sulfoximine 1 in THF-d8 using {1 H, 6 Li, 13 C, 15 N, 19 F} NMR experiments at low temperatures reveal that a first deprotonation occurs that leads to dimeric and tetrameric N-lithiated sulfoximine (93 : 7). Using an excess n-BuLi (5 equivalents), the second deprotonation on the ortho-position of the aromatic occurs. Six species were observed and characterized on the way. It includes three aggregates involving a sulfoximine: i) a [dilithiated sulfoximine/(n-BuLi)] dimer solvated by four molecules of THF (Agg2, 39 %); ii) a [dilithiated sulfoximine/(n-BuLi)3 ] tetramer solvated by six molecules of THF (Agg3, 39 %); iii) a [dilithiated sulfoximine/(n-BuOLi)3 ] tetramer solvated by four molecules of THF (Agg1, 22 %). A DFT study afforded optimized solvated structures for all these aggregates, fully consistent with the NMR data.
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Affiliation(s)
- Matthieu Hédouin
- Laboratoire COBRA (UMR 6014 & FR 3038), Normandie Université, UNIROUEN, INSA Rouen, CNRS Rue Tesniere, 76821, Mont Saint Aignan, France
| | - Anne-Laure Barthelemy
- Institut Lavoisier de Versailles (UMR 8180), Université Paris-Saclay, UVSQ, CNRS, 45 avenue des Etats-Unis, 78035, Versailles, France
| | - Nicolas Vanthuyne
- iSm2, UMR 7313, Aix Marseille Univ, CNRS, Centrale Marseille, AMUtech, 13288, Marseille, France
| | - Hend Besrour
- Laboratoire COBRA (UMR 6014 & FR 3038), Normandie Université, UNIROUEN, INSA Rouen, CNRS Rue Tesniere, 76821, Mont Saint Aignan, France
| | - Jacques Maddaluno
- Laboratoire COBRA (UMR 6014 & FR 3038), Normandie Université, UNIROUEN, INSA Rouen, CNRS Rue Tesniere, 76821, Mont Saint Aignan, France
| | - Emmanuel Magnier
- Institut Lavoisier de Versailles (UMR 8180), Université Paris-Saclay, UVSQ, CNRS, 45 avenue des Etats-Unis, 78035, Versailles, France
| | - Hassan Oulyadi
- Laboratoire COBRA (UMR 6014 & FR 3038), Normandie Université, UNIROUEN, INSA Rouen, CNRS Rue Tesniere, 76821, Mont Saint Aignan, France
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Hirata Y, Sekine D, Kato Y, Lin L, Kojima M, Yoshino T, Matsunaga S. Cobalt(III)/Chiral Carboxylic Acid-Catalyzed Enantioselective Synthesis of Benzothiadiazine-1-oxides via C-H Activation. Angew Chem Int Ed Engl 2022; 61:e202205341. [PMID: 35491238 DOI: 10.1002/anie.202205341] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Indexed: 12/11/2022]
Abstract
Among sulfoximine derivatives containing a chiral sulfur center, benzothiadiazine-1-oxides are important for applications in medicinal chemistry. Here, we report that the combination of an achiral cobalt(III) catalyst and a pseudo-C2 -symmetric H8 -binaphthyl chiral carboxylic acid enables the asymmetric synthesis of benzothiadiazine-1-oxides from sulfoximines and dioxazolones via enantioselective C-H bond cleavage. With the optimized protocol, benzothiadiazine-1-oxides with several functional groups can be accessed with high enantioselectivity.
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Affiliation(s)
- Yuki Hirata
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-ku, Sapporo, 060-0812, Japan
| | - Daichi Sekine
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-ku, Sapporo, 060-0812, Japan
| | - Yoshimi Kato
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-ku, Sapporo, 060-0812, Japan
| | - Luqing Lin
- Zhang Dayu School of Chemistry, Dalian University of Technology, Dalian, 116024, P. R. China.,Global Station for Biosurfaces and Drug Discovery, Hokkaido University, Kita-ku, Sapporo, 060-0812, Japan
| | - Masahiro Kojima
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-ku, Sapporo, 060-0812, Japan
| | - Tatsuhiko Yoshino
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-ku, Sapporo, 060-0812, Japan.,Global Station for Biosurfaces and Drug Discovery, Hokkaido University, Kita-ku, Sapporo, 060-0812, Japan
| | - Shigeki Matsunaga
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-ku, Sapporo, 060-0812, Japan.,Global Station for Biosurfaces and Drug Discovery, Hokkaido University, Kita-ku, Sapporo, 060-0812, Japan
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Tamburini G, Pereira-Peixoto MH, Borth J, Lotz S, Wintermantel D, Allan MJ, Dean R, Schwarz JM, Knauer A, Albrecht M, Klein AM. Fungicide and insecticide exposure adversely impacts bumblebees and pollination services under semi-field conditions. Environ Int 2021; 157:106813. [PMID: 34455190 DOI: 10.1016/j.envint.2021.106813] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 07/30/2021] [Accepted: 07/30/2021] [Indexed: 06/13/2023]
Abstract
Sulfoximines, the next generation systemic insecticides developed to replace neonicotinoids, have been shown to negatively impact pollinator development and reproduction. However, field-realistic studies on sulfoximines are few and consequences on pollination services unexplored. Moreover, the impacts of other agrochemicals such as fungicides, and their combined effects with insecticides remain poorly investigated. Here, we show in a full factorial semi-field experiment that spray applications of both the product Closer containing the insecticide sulfoxaflor and the product Amistar containing the fungicide azoxystrobin, negatively affected the individual foraging performance of bumblebees (Bombus terrestris). Insecticide exposure further reduced colony growth and size whereas fungicide exposure decreased pollen deposition. We found indications for resource limitation that might have exacerbated pesticide effects on bumblebee colonies. Our work demonstrates that field-realistic exposure to sulfoxaflor can adversely impact bumblebees and that applications before bloom may be insufficient as a mitigation measure to prevent its negative impacts on pollinators. Moreover, fungicide use during bloom could reduce bumblebee foraging performance and pollination services.
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Affiliation(s)
- Giovanni Tamburini
- University of Freiburg, Nature Conservation and Landscape Ecology, Freiburg, Germany; University of Bari, Department of Soil, Plant and Food Sciences (DiSSPA - Entomology), Bari, Italy.
| | | | - Jonas Borth
- University of Freiburg, Nature Conservation and Landscape Ecology, Freiburg, Germany
| | - Simon Lotz
- University of Freiburg, Nature Conservation and Landscape Ecology, Freiburg, Germany
| | - Dimitry Wintermantel
- University of Freiburg, Nature Conservation and Landscape Ecology, Freiburg, Germany
| | | | | | | | - Anina Knauer
- Agroscope, Agroecology and Environment, Zurich, Switzerland
| | | | - Alexandra-Maria Klein
- University of Freiburg, Nature Conservation and Landscape Ecology, Freiburg, Germany
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Watson GB, Olson MB, Beavers KW, Loso MR, Sparks TC. Characterization of a nicotinic acetylcholine receptor binding site for sulfoxaflor, a new sulfoximine insecticide for the control of sap-feeding insect pests. Pestic Biochem Physiol 2017; 143:90-94. [PMID: 29183616 DOI: 10.1016/j.pestbp.2017.09.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Revised: 08/30/2017] [Accepted: 09/02/2017] [Indexed: 06/07/2023]
Abstract
Sulfoxaflor (SFX, Isoclast™ Active) is a recently developed sulfoximine insecticide that is highly effective against sap-feeding insect pests. SFX has been shown to act through an interaction with insect nicotinic acetylcholine receptors (nAChRs). SFX was previously found to interact weakly with the binding site for the neonicotinoid imidacloprid. However, radioligand displacement studies characterizing the binding site of the insecticide SFX itself have not been conducted. In this study, we report the characterization of a high affinity [3H]SFX Myzus persicae (green peach aphid, GPA) binding site with relatively low abundance. Through the evaluation of a set of SFX analogs, we have demonstrated that displacement of [3H]SFX shows an excellent correlation with GPA toxicity, and thus is toxicologically relevant. Comparison with the previously described methyl-SFX binding site information reveals differences with the SFX binding site that are discussed herein. [3H]SFX therefore represents a new tool for the characterization of insect nAChRs.
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Affiliation(s)
- Gerald B Watson
- Dow AgroSciences, LLC, 9330 Zionsville Rd., Indianapolis, IN 46268, United States.
| | - Monica B Olson
- Dow AgroSciences, LLC, 9330 Zionsville Rd., Indianapolis, IN 46268, United States
| | - Kenneth W Beavers
- Dow AgroSciences, LLC, 9330 Zionsville Rd., Indianapolis, IN 46268, United States
| | - Michael R Loso
- Dow AgroSciences, LLC, 9330 Zionsville Rd., Indianapolis, IN 46268, United States
| | - Thomas C Sparks
- Dow AgroSciences, LLC, 9330 Zionsville Rd., Indianapolis, IN 46268, United States
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Sparks TC, Watson GB, Loso MR, Geng C, Babcock JM, Thomas JD. Sulfoxaflor and the sulfoximine insecticides: chemistry, mode of action and basis for efficacy on resistant insects. Pestic Biochem Physiol 2013; 107:1-7. [PMID: 25149228 DOI: 10.1016/j.pestbp.2013.05.014] [Citation(s) in RCA: 215] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2013] [Revised: 05/30/2013] [Accepted: 05/31/2013] [Indexed: 06/03/2023]
Abstract
The sulfoximines, as exemplified by sulfoxaflor ([N-[methyloxido[1-[6-(trifluoromethyl)-3-pyridinyl]ethyl]-λ(4)-sulfanylidene] cyanamide] represent a new class of insecticides. Sulfoxaflor exhibits a high degree of efficacy against a wide range of sap-feeding insects, including those resistant to neonicotinoids and other insecticides. Sulfoxaflor is an agonist at insect nicotinic acetylcholine receptors (nAChRs) and functions in a manner distinct from other insecticides acting at nAChRs. The sulfoximines also exhibit structure activity relationships (SAR) that are different from other nAChR agonists such as the neonicotinoids. This review summarizes the sulfoximine SAR, mode of action and the biochemistry underlying the observed efficacy on resistant insect pests, with a particular focus on sulfoxaflor.
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Affiliation(s)
- Thomas C Sparks
- Dow AgroSciences, 9330 Zionsville Road, Indianapolis, IN 46268, United States.
| | - Gerald B Watson
- Dow AgroSciences, 9330 Zionsville Road, Indianapolis, IN 46268, United States
| | - Michael R Loso
- Dow AgroSciences, 9330 Zionsville Road, Indianapolis, IN 46268, United States
| | - Chaoxian Geng
- Dow AgroSciences, 9330 Zionsville Road, Indianapolis, IN 46268, United States
| | - Jon M Babcock
- Dow AgroSciences, 9330 Zionsville Road, Indianapolis, IN 46268, United States
| | - James D Thomas
- Dow AgroSciences, 9330 Zionsville Road, Indianapolis, IN 46268, United States
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