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Frackenpohl J, Barber DM, Bojack G, Bollenbach-Wahl B, Braun R, Getachew R, Hohmann S, Ko KY, Kurowski K, Laber B, Mattison RL, Müller T, Reingruber AM, Schmutzler D, Svejda A. Synthesis and biological profile of 2,3-dihydro[1,3]thiazolo[4,5- b]pyridines, a novel class of acyl-ACP thioesterase inhibitors. Beilstein J Org Chem 2024; 20:540-551. [PMID: 38440172 PMCID: PMC10910475 DOI: 10.3762/bjoc.20.46] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Accepted: 02/16/2024] [Indexed: 03/06/2024] Open
Abstract
The present work covers novel herbicidal lead structures that contain a 2,3-dihydro[1,3]thiazolo[4,5-b]pyridine scaffold as structural key feature carrying a substituted phenyl side chain. These new compounds show good acyl-ACP thioesterase inhibition in line with strong herbicidal activity against commercially important weeds in broadacre crops, e.g., wheat and corn. The desired substituted 2,3-dihydro[1,3]thiazolo[4,5-b]pyridines were prepared via an optimized BH3-mediated reduction involving tris(pentafluorophenyl)borane as a strong Lewis acid. Remarkably, greenhouse trials showed that some of the target compounds outlined herein display promising control of grass weed species in preemergence application, combined with a dose response window that enables partial selectivity in certain crops.
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Affiliation(s)
- Jens Frackenpohl
- Research & Development, Weed Control, Crop Science Division, Bayer AG, Industriepark Höchst, 65926 Frankfurt am Main, Germany
| | - David M Barber
- Research & Development, Weed Control, Crop Science Division, Bayer AG, Industriepark Höchst, 65926 Frankfurt am Main, Germany
| | - Guido Bojack
- Research & Development, Weed Control, Crop Science Division, Bayer AG, Industriepark Höchst, 65926 Frankfurt am Main, Germany
| | - Birgit Bollenbach-Wahl
- Research & Development, Weed Control, Crop Science Division, Bayer AG, Industriepark Höchst, 65926 Frankfurt am Main, Germany
| | - Ralf Braun
- Research & Development, Weed Control, Crop Science Division, Bayer AG, Industriepark Höchst, 65926 Frankfurt am Main, Germany
| | - Rahel Getachew
- Research & Development, Weed Control, Crop Science Division, Bayer AG, Industriepark Höchst, 65926 Frankfurt am Main, Germany
| | - Sabine Hohmann
- Research & Development, Weed Control, Crop Science Division, Bayer AG, Industriepark Höchst, 65926 Frankfurt am Main, Germany
| | - Kwang-Yoon Ko
- Research & Development, Weed Control, Crop Science Division, Bayer AG, Industriepark Höchst, 65926 Frankfurt am Main, Germany
| | - Karoline Kurowski
- Research & Development, Weed Control, Crop Science Division, Bayer AG, Industriepark Höchst, 65926 Frankfurt am Main, Germany
| | - Bernd Laber
- Research & Development, Weed Control, Crop Science Division, Bayer AG, Industriepark Höchst, 65926 Frankfurt am Main, Germany
| | - Rebecca L Mattison
- Research & Development, Weed Control, Crop Science Division, Bayer AG, Industriepark Höchst, 65926 Frankfurt am Main, Germany
| | - Thomas Müller
- Research & Development, Weed Control, Crop Science Division, Bayer AG, Industriepark Höchst, 65926 Frankfurt am Main, Germany
| | - Anna M Reingruber
- Research & Development, Weed Control, Crop Science Division, Bayer AG, Industriepark Höchst, 65926 Frankfurt am Main, Germany
| | - Dirk Schmutzler
- Research & Development, Weed Control, Crop Science Division, Bayer AG, Industriepark Höchst, 65926 Frankfurt am Main, Germany
| | - Andrea Svejda
- Research & Development, Weed Control, Crop Science Division, Bayer AG, Industriepark Höchst, 65926 Frankfurt am Main, Germany
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He Y, Wen Z, Nie W, Yang L. Mechanistic Study of B(C 6F 5) 3-Catalyzed Transfer Hydrogenation of Aldehydes/Ketones with PhSiH 3 and Stoichiometric Water. ACS OMEGA 2024; 9:341-350. [PMID: 38222538 PMCID: PMC10785341 DOI: 10.1021/acsomega.3c05388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 10/24/2023] [Accepted: 11/27/2023] [Indexed: 01/16/2024]
Abstract
A DFT study was performed on the mechanisms of B(C6F5)3-catalyzed transfer hydrogenation of aldehydes/ketones, using PhSiH3 and stoichiometric water. Path B2 includes a stepwise Piers SN2-Si process, H- transfer, and hydrolysis desilylation of siloxane, in which the hydrolysis desilylation step is rate-determining. Path C1 is first determined, involving a B(C6F5)3-catalyzed concerted addition step of 2H2O to carbonyl generating R1R2C(OH)2, a subsequent SN2-Si dehydroxylation step of R1R2C(OH)2 giving R1R2C=OH+ and (C6F5)3B-H-, and final H- transfer producing the respective alcohol R1R2CHOH. A B(C6F5)3-catalyzed H2 generation process (Path H0) is determined. Path B2 is the only mechanism for the stepwise method. Using a one-time one-pot feeding method, alkyl/aryl aldehydes, dialkyl ketones, and alkyl aryl ketones (1a-g) can be reduced into alcohols chemoselectively and effectively at room temperature. More than 1 equiv of water over substrates is necessary. Herein, Path C1 is the dominant transfer hydrogenation pathway, and the H2 generation is efficiently inhibited, by the competitive advantage of Path C1 and initial dominant existence of the complexes IM0 and IM1-x. The diaryl ketones (1h,1i) cannot be efficiently reduced into the respective alcohols using the one-time feeding one-pot method. The barriers of C-TS1-h/i are obviously higher than those of C-TS1-a-g, attributed to the electron-donating and space effects of the two aryls on carbonyl C. The possible Paths B2 and C1 of transfer hydrogenation have no competitive advantage with Path H0. The DFT results are consistent with the experiments.
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Affiliation(s)
- Yunqing He
- Sichuan
Province Engineering Technology Research Center of Oil Cinnamon and Key Lab of Process
Analysis and Control of Sichuan Universities, Yibin University, Yibin 644000, Sichuan, People’s Republic of China
| | - Zhiguo Wen
- Leshan Engineering Research Center for Medicinal Components
of Characteristic
AgroProducts and Leshan West Silicon Materials Photovoltaic and New Energy Industry
Technology research Institute, Leshan Normal
University, Leshan 614000, Sichuan, People’s Republic of China
| | - Wanli Nie
- Department
of Material Science, Shenzhen MSU-BIT University, Shenzhen 518172, Guangdong, People’s
Republic of China
| | - Li Yang
- Faculty of
Materials and Chemical Engineering, Yibin
University, Yibin 644000, Sichuan, People’s Republic of China
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