1
|
Fujihira Y, Iwasaki H, Sumii Y, Adachi H, Kagawa T, Shibata N. Continuous-Flow Synthesis of Perfluoroalkyl Ketones via Perfluoroalkylation of Esters Using HFC-23 and HFC-125 under a KHMDS–Triglyme System. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2022. [DOI: 10.1246/bcsj.20220162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yamato Fujihira
- Department of Engineering, Life Science and Applied Chemistry Program, Nagoya Institute of Technology, Gokiso-cho, Showa-Ku, Nagoya 466-8555, Japan
| | - Hiroto Iwasaki
- Department of Engineering, Life Science and Applied Chemistry Program, Nagoya Institute of Technology, Gokiso-cho, Showa-Ku, Nagoya 466-8555, Japan
| | - Yuji Sumii
- Department of Engineering, Life Science and Applied Chemistry Program, Nagoya Institute of Technology, Gokiso-cho, Showa-Ku, Nagoya 466-8555, Japan
| | - Hiroaki Adachi
- Tosoh Finechem Corporation, 4988, Kaiseicho, Shunan, 746-0006, Japan
| | - Takumi Kagawa
- Tosoh Finechem Corporation, 4988, Kaiseicho, Shunan, 746-0006, Japan
| | - Norio Shibata
- Department of Engineering, Life Science and Applied Chemistry Program, Nagoya Institute of Technology, Gokiso-cho, Showa-Ku, Nagoya 466-8555, Japan
- Department of Nanopharmaceutical Sciences, Nagoya Institute of Technology, Gokiso-cho, Showa-Ku, Nagoya 466-8555, Japan
| |
Collapse
|
2
|
Fujihira Y, Liang Y, Ono M, Hirano K, Kagawa T, Shibata N. Synthesis of trifluoromethyl ketones by nucleophilic trifluoromethylation of esters under a fluoroform/KHMDS/triglyme system. Beilstein J Org Chem 2021; 17:431-438. [PMID: 33633811 PMCID: PMC7884878 DOI: 10.3762/bjoc.17.39] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Accepted: 02/02/2021] [Indexed: 12/29/2022] Open
Abstract
A straightforward method that enables the formation of biologically attractive trifluoromethyl ketones from readily available methyl esters using the potent greenhouse gas fluoroform (HCF3, HFC-23) was developed. The combination of fluoroform and KHMDS in triglyme at −40 °C was effective for this transformation, with good yields as high as 92%. Substrate scope of the trifluoromethylation procedure was explored for aromatic, aliphatic, and conjugated methyl esters. This study presents a straightforward trifluoromethylation process of various methyl esters that convert well to the corresponding trifluoromethyl ketones. The tolerance of various pharmacophores under the reaction conditions was also explored.
Collapse
Affiliation(s)
- Yamato Fujihira
- Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-5888, Japan
| | - Yumeng Liang
- Department of Nanopharmaceutical Sciences, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-5888, Japan
| | - Makoto Ono
- Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-5888, Japan
| | - Kazuki Hirano
- Department of Nanopharmaceutical Sciences, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-5888, Japan
| | - Takumi Kagawa
- Tosoh Finechem Corporation, 4988, Kaiseicho, Shunan, 746-0006, Japan
| | - Norio Shibata
- Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-5888, Japan.,Department of Nanopharmaceutical Sciences, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-5888, Japan.,Institute of Advanced Fluorine-Containing Materials, Zhejiang Normal University, 688 Yingbin Avenue, 321004 Jinhua, China
| |
Collapse
|
3
|
Belligund K, Mathew T, Hunt JR, Nirmalchandar A, Haiges R, Dawlaty J, Prakash GKS. Photochemistry of 2-Nitroarenes: 2-Nitrophenyl-α-trifluoromethyl Carbinols as Synthons for Fluoroorganics. J Am Chem Soc 2019; 141:15921-15931. [PMID: 31556624 DOI: 10.1021/jacs.9b07241] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Facile synthesis of a new series of 2,2'-bis(trifluoroacetyl) azoxybenzene derivatives and trifluoromethylated benzo[c]isoxazoline systems, along with trifluoroacetyl nitrosobenzene derivatives was achieved by solvent controlled photolysis of appropriate 2-nitrobenzyl alcohols. Corresponding photoactive 2-nitrobenzyl chromophore plays a distinct role in this photosynthetic process, while, quite unprecedented, pertinent fluoromethyl substitution leads to high value fluoromethylated products, whose direct access is not feasible by common synthetic protocols. The significance of fluorine and fluoroalkyl substitution and its prominent biological effects makes this new photochemical approach an important discovery in synthetic methodology. Plausible mechanistic pathways involved in the formation of the products during steady-state photolysis are further established by picosecond laser flash photolysis experiments.
Collapse
Affiliation(s)
- Kavita Belligund
- Loker Hydrocarbon Research Institute and Department of Chemistry , University of Southern California , Los Angeles , California 90089-1661 , United States.,Department of Chemistry , University of Southern California , Los Angeles , California 90089-1661 , United States
| | - Thomas Mathew
- Loker Hydrocarbon Research Institute and Department of Chemistry , University of Southern California , Los Angeles , California 90089-1661 , United States.,Department of Chemistry , University of Southern California , Los Angeles , California 90089-1661 , United States
| | - Jonathan R Hunt
- Department of Chemistry , University of Southern California , Los Angeles , California 90089-1661 , United States
| | - Archith Nirmalchandar
- Loker Hydrocarbon Research Institute and Department of Chemistry , University of Southern California , Los Angeles , California 90089-1661 , United States.,Department of Chemistry , University of Southern California , Los Angeles , California 90089-1661 , United States
| | - Ralf Haiges
- Loker Hydrocarbon Research Institute and Department of Chemistry , University of Southern California , Los Angeles , California 90089-1661 , United States.,Department of Chemistry , University of Southern California , Los Angeles , California 90089-1661 , United States
| | - Jahan Dawlaty
- Department of Chemistry , University of Southern California , Los Angeles , California 90089-1661 , United States
| | - G K Surya Prakash
- Loker Hydrocarbon Research Institute and Department of Chemistry , University of Southern California , Los Angeles , California 90089-1661 , United States.,Department of Chemistry , University of Southern California , Los Angeles , California 90089-1661 , United States
| |
Collapse
|
4
|
Quero C, Camps F, Guerrero A. Behavior of processionary males (Thaumetopoea pityocampa) induced by sex pheromone and analogs in a wind tunnel. J Chem Ecol 2013; 21:1957-69. [PMID: 24233899 DOI: 10.1007/bf02033855] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/1995] [Accepted: 07/23/1995] [Indexed: 11/24/2022]
Abstract
The behavioral response of processionary males (Thaumetopoea pityocampa) to the natural pheromone (Z)-13-hexadecen-11-ynyl acetate (1) and structurally related analogs in a wind tunnel is presented. Stereomerically pureZ-1 and a mixture with theE isomer in 80:20 ratio elicited similar attraction responses at 1 µg and higher. The activity was dose-dependent, being optimum at 1 µg with 90% and 80% of males contacting with the source in the presence of theZ-1 andZ/E-1, respectively. 11-Hexadecynyl acetate (2) functioned as a pheromone mimic, being able to induce the complete mate-finding behavioral sequence, although its activity was much lower than that of the pheromone. (Z)-13-Hexadecen-11-ynyl alcohol (3) and, particularly, (Z)-13-hexadecen-11-ynal (4) were potent inhibitors of the upwind flight response in mixtures withZ-1 in 99:1, 95:5, and 91:9 ratios. (Z)-1,1,1-Trifluoro-16-nonadecen-14-yn-2-one (5) also inhibited the response of males to pheromone, particularly in the source contact behavior. Comparison with activity displayed by analogs in field tests is also reported.
Collapse
Affiliation(s)
- C Quero
- Department of Biological Organic Chemistry, C.I.D. (CSIC), Jordi Girona, 18-26, 08034, Barcelona, Spain
| | | | | |
Collapse
|
5
|
Muñoz L, Bosch MP, Batllori L, Rosell G, Bosch D, Guerrero A, Avilla J. Synthesis of allylic trifluoromethyl ketones and their activity as inhibitors of the sex pheromone of the leopard moth, Zeuzera pyrina L. (Lepidoptera: Cossidae). PEST MANAGEMENT SCIENCE 2011; 67:956-964. [PMID: 21394886 DOI: 10.1002/ps.2139] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2010] [Revised: 11/18/2010] [Accepted: 11/23/2010] [Indexed: 05/30/2023]
Abstract
BACKGROUND Trifluoromethyl ketones (TFMKs), structurally related to the pheromones, are good inhibitors of pheromone communication in insects. To determine their activity on Zeuzera pyrina L. (Lepidoptera: Cossidae), a polyphagous pest, the authors have prepared two diunsaturated TFMK analogues of the major (3) and the minor (4) pheromone components, and two monounsaturated ones (5, 6). Their biological activity in electroantennogram (EAG), wind tunnel and field tests is presented. RESULTS The synthetic strategy to obtain the allylic TFMKs 3 and 5 is based on the reactions of diene 10 and 1-octadecene with trifluoroacetaldehyde ethyl hemiacetal, followed by Dess-Martin oxidation of the resulting homoallylic trifluoromethyl alcohols. In EAG, topical application of analogues 3 and 4 on male antennae significantly reduced the pheromone response. In the wind tunnel, compound 4 reduced the number of contacts with the pheromone source. In the field, traps baited with mixtures of pheromone and inhibitors captured significantly fewer males than the pheromone alone. CONCLUSION An efficient synthesis of allylic TFMKs is reported, with good overall yield, regiospecificity and diastereoselectivity. These compounds are good inhibitors of the pheromone in electrophysiology, wind tunnel and field tests. The results show the importance of two unsaturations at positions 2 and 13 of the trifluoroacyl group in the structure of the analogues, the latter being critical for inhibitory activity.
Collapse
Affiliation(s)
- Lourdes Muñoz
- Departament de Quimica Biològica i Modelització Molecular (IQAC-CSIC), Barcelona, Spain
| | | | | | | | | | | | | |
Collapse
|
6
|
Rayo J, Muñoz L, Rosell G, Hammock BD, Guerrero A, Luque FJ, Pouplana R. Reactivity versus steric effects in fluorinated ketones as esterase inhibitors: a quantum mechanical and molecular dynamics study. J Mol Model 2010; 16:1753-64. [PMID: 20676708 PMCID: PMC3014912 DOI: 10.1007/s00894-010-0807-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2009] [Accepted: 07/09/2010] [Indexed: 11/24/2022]
Abstract
Carboxylesterases (CEs) are a family of ubiquitous enzymes with broad substrate specificity, and their inhibition may have important implications in pharmaceutical and agrochemical fields. One of the most potent inhibitors both for mammalian and insect CEs are trifluoromethyl ketones (TFMKs), but the mechanism of action of these chemicals is not completely understood. This study examines the balance between reactivity versus steric effects in modulating the activity against human carboxylesterase 1. The intrinsic reactivity of the ketone moiety is determined from quantum mechanical computations, which combine gas phase B3LYP calculations with hydration free energies estimated with the IEF/MST model. In addition, docking and molecular dynamics simulations are used to explore the binding mode of the inhibitors along the deep gorge that delineates the binding site. The results point out that the activity largely depends on the nature of the fluorinated ketone, since the activity is modulated by the balance between the intrinsic electrophilicity of the carbonyl carbon atom and the ratio between keto and hydrate forms. However, the results also suggest that the correct alignment of the alkyl chain in the binding site can exert a large influence on the inhibitory activity, as this effect seems to override the intrinsic reactivity features of the fluorinated ketone. Overall, the results sustain a subtle balance between reactivity and steric effects in modulating the inhibitory activity of TFMK inhibitors.
Collapse
Affiliation(s)
- Josep Rayo
- Department of Biological Chemistry and Molecular Modeling, IQAC (CSIC), Jordi Girona 18-26, 08034 Barcelona, Spain
| | - Lourdes Muñoz
- Department of Biological Chemistry and Molecular Modeling, IQAC (CSIC), Jordi Girona 18-26, 08034 Barcelona, Spain
| | - Gloria Rosell
- Pharmaceutical Chemistry, Unity Associated to CSIC, Faculty of Pharmacy, University of Barcelona, Avda. Diagonal 643, 08028 Barcelona, Spain
| | - Bruce D. Hammock
- Department of Entomology and Cancer Center, University of California, Davis, CA 95616, USA
| | - Angel Guerrero
- Department of Biological Chemistry and Molecular Modeling, IQAC (CSIC), Jordi Girona 18-26, 08034 Barcelona, Spain
| | - F. Javier Luque
- Department of Physical Chemistry and Institute of Biomedicine (IBUB), Faculty of Pharmacy, University of Barcelona, Avda. Diagonal 643, 08028 Barcelona, Spain
| | - Ramon Pouplana
- Department of Physical Chemistry and Institute of Biomedicine (IBUB), Faculty of Pharmacy, University of Barcelona, Avda. Diagonal 643, 08028 Barcelona, Spain
| |
Collapse
|
7
|
Rosa E, Guerrero A, Bosch MP, Julià L. EPR/spin-trapping study of free radical intermediates in the photolysis of trifluoromethyl ketones with initiators. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2010; 48:198-204. [PMID: 20058258 DOI: 10.1002/mrc.2566] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Photolysis of trifluoromethyl ketones (TFMKs) 1a-1e versus the non-fluorinated ketones 2a-2b in the presence of radical initiators by electron paramagnetic resonance spectroscopy has been studied for the first time. The transient radicals generated after irradiation of the ketones were identified by trapping with 2-methyl-2-nitrosopropane (MNP) and 2,4,6-tri-tert-butylnitrosobenzene (TTBNB) as spin traps. TTBNB is a powerful, particularly useful spin trap in these kinds of processes producing anilino and nitroxyl spin adducts due to the ambivalent reactivity on the N and O atoms. In the presence of t-butylperoxide, short-chain TFMKs, such as 1,1,1-trifluoroacetone (1d) and hexafluoroacetone (1e), give rise to detection of the elusive trifluoromethyl radical. In contrast, long-chain TFMKs did not provide clues to prove formation of the trifluoromethyl radical but instead to radicals derived by abstraction of one alpha-methylene proton to the carbonyl. Although TFMKs are quite stable to photodegradation in the absence of initiator, methyl ketone 2b and phenyl ketone 3 produce radicals resulting from abstraction of a gamma-hydrogen to the carbonyl group.
Collapse
Affiliation(s)
- Esmeralda Rosa
- Department of Biological Chemistry and Molecular Modellization, IQAC (CSIC), Jordi Girona, 18-26, 08034 Barcelona, Spain
| | | | | | | |
Collapse
|
8
|
Wogulis M, Wheelock CE, Kamita SG, Hinton AC, Whetstone PA, Hammock BD, Wilson DK. Structural studies of a potent insect maturation inhibitor bound to the juvenile hormone esterase of Manduca sexta. Biochemistry 2006; 45:4045-57. [PMID: 16566578 PMCID: PMC4275126 DOI: 10.1021/bi0521644] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Juvenile hormone (JH) is an insect hormone containing an alpha,beta-unsaturated ester consisting of a small alcohol and long, hydrophobic acid. JH degradation is required for proper insect development. One pathway of this degradation is through juvenile hormone esterase (JHE), which cleaves the JH ester bond to produce methanol and JH acid. JHE is a member of the functionally divergent alpha/beta-hydrolase family of enzymes and is a highly efficient enzyme that cleaves JH at very low in vivo concentrations. We present here a 2.7 A crystal structure of JHE from the tobacco hornworm Manduca sexta (MsJHE) in complex with the transition state analogue inhibitor 3-octylthio-1,1,1-trifluoropropan-2-one (OTFP) covalently bound to the active site. This crystal structure, the first JHE structure reported, contains a long, hydrophobic binding pocket with the solvent-inaccessible catalytic triad located at the end. The structure explains many of the interactions observed between JHE and its substrates and inhibitors, such as the preference for small alcohol groups and long hydrophobic backbones. The most potent JHE inhibitors identified to date contain a trifluoromethyl ketone (TFK) moiety and have a sulfur atom beta to the ketone. In this study, sulfur-aromatic interactions were observed between the sulfur atom of OTFP and a conserved aromatic residue in the crystal structure. Mutational analysis supported the hypothesis that these interactions contribute to the potency of sulfur-containing TFK inhibitors. Together, these results clarify the binding mechanism of JHE inhibitors and provide useful observations for the development of additional enzyme inhibitors for a variety of enzymes.
Collapse
Affiliation(s)
- Mark Wogulis
- Department of Molecular and Cellular Biology, University of California, Davis, CA 95616
| | - Craig E. Wheelock
- Department of Entomology and Cancer Research Center, University of California, 303, Briggs Hall, 1 Shields Avenue, Davis, CA 95616, USA
| | - Shizuo G. Kamita
- Department of Entomology and Cancer Research Center, University of California, 303, Briggs Hall, 1 Shields Avenue, Davis, CA 95616, USA
| | - Andrew C. Hinton
- Department of Entomology and Cancer Research Center, University of California, 303, Briggs Hall, 1 Shields Avenue, Davis, CA 95616, USA
| | - Paul A. Whetstone
- Department of Entomology and Cancer Research Center, University of California, 303, Briggs Hall, 1 Shields Avenue, Davis, CA 95616, USA
| | - Bruce D. Hammock
- Department of Entomology and Cancer Research Center, University of California, 303, Briggs Hall, 1 Shields Avenue, Davis, CA 95616, USA
| | - David K. Wilson
- Department of Molecular and Cellular Biology, University of California, Davis, CA 95616
- Corresponding Author. E-mail: Phone: (530) 752-1136 Fax: (530) 752-3085
| |
Collapse
|
9
|
Riba M, Sans A, Solé J, Muñoz L, Bosch MP, Rosell G, Guerrero A. Antagonism of pheromone response of Ostrinia nubilalis males and implications on behavior in the laboratory and in the field. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2005; 53:1158-1165. [PMID: 15713034 DOI: 10.1021/jf048994q] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The antagonistic effect on the pheromone response and catabolism of male European corn borers, Ostrinia nubilalis, by several trifluoromethyl ketones is reported. (Z)-11-Tetradecenyl trifluoromethyl ketone (Z11-14:TFMK), the most closely related analogue of the main component of the pheromone, elicits a remarkable disruptive effect on close approach and source contact of males flying to a source baited with mixtures of the pheromone and the antagonist in 5:1 and 10:1 ratios. In this experiment, the male displayed an erratic flight track with frequent counter turns and intersections with the plume. In the field, the TFMK significantly lowered the number of males caught when mixed with the pheromone in a 10:1 ratio in comparison with the natural attractant. The compound was also a good inhibitor of the antennal esterase of the insect with a IC(50) value of 0.28 muM. The homologous (Z)-10-tridecenyl trifluoromethyl ketone, with one carbon less in the chain, also elicited an antagonistic effect in the wind tunnel, but in the field, the results were not conclusive. The effect induced was lower than the one displayed by Z11-14:TFMK including the activity as the esterase inhibitor (IC(50) value of 7.55 muM). The saturated tetradecyl trifluoromethyl ketone, tetradecyltrifluoropyruvamide, and (Z)-11-2-thiatetradecenyl trifluoromethyl ketone resulted completely inactive. The results obtained in conjunction to the previously shown low toxicity to mice by related trifluoromethyl ketones provide new important data for the putative utilization of these chemicals as new pest control agents.
Collapse
Affiliation(s)
- Magi Riba
- Universitat de Lleida, Centre UdL-IRTA, Rovira Roure 177, 25198 Lleida, Spain.
| | | | | | | | | | | | | |
Collapse
|
10
|
Olivella S, Solé A, Jiménez O, Bosch MP, Guerrero A. New Selective Haloform-type Reaction Yielding 3-Hydroxy-2,2-difluoroacids: Theoretical Study of the Mechanism. J Am Chem Soc 2005; 127:2620-7. [PMID: 15725018 DOI: 10.1021/ja043522d] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Experimental results of an unprecedented haloform-type reaction in which 4-alkyl-4-hydroxy-3,3-difluoromethyl trifluoromethyl ketones undergo base-promoted selective cleavage of the CO-CF(3) bond, yielding 3-hydroxy-2,2-difluoroacids and fluoroform, are rationalized using DFT (B3LYP) calculations. The gas-phase addition of hydroxide ion to 1,1,1,3,3-pentafluoro-4-hydroxypentan-2-one (R) is found to be a barrierless process, yielding a tetrahedral intermediate (INT), involving a DeltaG(r)(298 K) of -61.4 kcal/mol. The CO-CF(3) bond cleavage in INT leads to a hydrogen-bonded [CH(3)CHOHCF(2)CO(2)H...CF(3)](-) complex by passage through a transition structure (TS1) with a DeltaG()(298 K) of 20.8 kcal/mol and a DeltaG(r)(298 K) of 9.8 kcal/mol. This complex undergoes a proton transfer between its components, yielding a hydrogen-bonded [CH(3)CHOHCF(2)CO(2)...CHF(3)](-) complex. This process has associated with it a DeltaG()(298 K) of only 3.1 kcal/mol and a DeltaG(r)(298 K) of -43.3 kcal/mol. The CO-CF(2) bond cleavage in INT leads to a hydrogen-bonded [CH(3)CHOHCF(2)...CF(3)CO(2)H](-) complex by passage through a transition structure (TS3) with a DeltaG()(298 K) of 29.2 kcal/mol and a DeltaG(r)(298 K) of 25.1 kcal/mol. The lower energy barrier found for CO-CF(3) bond cleavage in INT is ascribed to the larger number of fluorine atoms stabilizing the negative charge accumulated on the CF(3) moiety of TS1, as compared to the number of fluorine atoms stabilizing the negative charge on the CH(3)CHOHCF(2) moiety of TS3. The solvent-induced effects on the two pathways, introduced within the SCRF formalism through PCM calculations, do not reverse the predicted preference of the CO-CF(3) over the CO-CF(2) bond cleavage of R in the gas phase.
Collapse
Affiliation(s)
- Santiago Olivella
- Departament de Química Orgànica Biologica, Institut d'Investigacions Químiques i Ambientals de Barcelona, CSIC, Jordi Girona 18, 08034-Barcelona, Catalonia, Spain.
| | | | | | | | | |
Collapse
|
11
|
Quero C, Rosell G, Jiménez O, Rodriguez S, Bosch MP, Guerrero A. New fluorinated derivatives as esterase inhibitors. Synthesis, hydration and crossed specificity studies. Bioorg Med Chem 2003; 11:1047-55. [PMID: 12614892 DOI: 10.1016/s0968-0896(02)00467-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
A variety of new fluorinated chemicals have been prepared for the first time and tested as inhibitors of esterases, one of the main enzymes involved in pheromone catabolism, in two economically important pests, the Egyptian armyworm Spodoptera littoralis (SL) and the Mediterranean corn borer Sesamia nonagrioides (SN). Using the respective major component of the pheromone as substrate, the K(m) and V(max) of the antennal esterase of both insects resulted to be 5.66 x 10(-4) M and 8.47 x 10(-6) Mmin(-1) for SL and 1.61 x 10(-7) M and 1.25 x 10(-7) Mmin(-1) for SN, pointing out that SN esterase has a higher affinity for its corresponding substrate than SL. In general, the trifluoromethyl ketones (TFMKs) exhibited higher inhibitory potency than the corresponding difluoromethyl ketones (DFMKs) or difluoroaldehydes (DFAs). The compounds appeared to hydrate differently in aqueous solution, the extent of hydration following the order: alpha,alpha-DFMKs<alpha,alpha-difluoro-beta-thioalkylmethyl ketones<TFMKs<beta-thiotrifluoromethyl ketones<alpha,alpha-DFAs. No clear correlation has been found between the K(hyd) and the inhibitory potency and no specificity has been found when the chemicals were assayed on extracts of both insects.
Collapse
Affiliation(s)
- Carmen Quero
- Department of Biological Organic Chemistry, Institute of Chemistry and Environmental Research (CSIC), Jordi Girona 18-26, 08034 Barcelona, Spain
| | | | | | | | | | | |
Collapse
|
12
|
Reddy GVP, Quero C, Guerrero A. Activity of octylthiotrifluoropropan-2-one, a potent esterase inhibitor, on growth, development, and intraspecific communication in Spodoptera littoralis and Sesamia nonagrioides. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2002; 50:7062-7068. [PMID: 12428960 DOI: 10.1021/jf020255r] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A series of experiments were conducted to examine the effect of 3-octylthio-1,1,1-trifluoro-2-propanone (OTFP) on growth, development, and behavior of the cotton leafworm, Spodoptera littoralis (Lepidoptera: Noctuidae), and the corn stalk borer, Sesamia nonagrioides (Lepidoptera: Noctuidae). The chemical behaved as an oviposition deterrent and, when added to the diet of the second-instar larvae of both insects, reduced diet consumption and growth, pupation, and adult emergence. Treatment of 100-5000 ng of the compound on fourth-instar larvae for 3-24 h, however, did not produce significant differences in the amount of diet ingested. Our results suggest that the effect of OTFP is long-lasting and that the inhibitor is not fully detoxified by the detoxification enzymes of the digestive tract of the insects. In behavioral assays, adult males which had been treated with the chemical at the larval stage were less attracted to the pheromone source than regular untreated males. When Sp. littoralis untreated females were used as the attractant source, treated males also displayed significantly fewer contacts with the cage-containing females than untreated or solvent-treated males. In the presence of treated females, only 27% of treated males successfully completed the flight in comparison to animals responding to solvent-treated females (54.5%). By contrast, when Se. nonagrioides females, whether they had been subjected or not to the treatment, were used as the attractant source, males were similarly attracted to them regardless of whether they had been treated or not at the larval stage. Analyses of gland extracts of Sp. littoralis treated females showed no difference from control insects in the qualitative or quantitative composition of the pheromone blend. The results obtained, in combination with other results previously reported by us (Riba, M.; Sans, A.; Bau, P.; Grolleau, G.; Renou, M.; Guerrero, A. J. Chem. Ecol. 2001, 27, 1879-1897), provide new and relevant information about the possible utility of these chemicals in future studies directed to the development of new approaches for pest control.
Collapse
Affiliation(s)
- Gadi V P Reddy
- Department of Biological Organic Chemistry, Institute of Chemical and Environmental Research (CSIC), Jordi Girona 18-26, 08034-Barcelona, Spain
| | | | | |
Collapse
|
13
|
Kim S, Kavali R. Radical-mediated synthesis of trifluoroethyl amines and trifluoromethyl ketones from alkyl iodides. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)01675-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
14
|
Renou M, Guerrero A. Insect parapheromones in olfaction research and semiochemical-based pest control strategies. ANNUAL REVIEW OF ENTOMOLOGY 2000; 45:605-630. [PMID: 10761591 DOI: 10.1146/annurev.ento.45.1.605] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The possibility of disrupting the chemical communication of insect pests has initiated the development of new semiochemicals, parapheromones, which are anthropogenic compounds structurally related to natural pheromone components. Modification at the chain and/or at the polar group, isosteric replacements, halogenation or introduction of labeled atoms have been the most common modifications of the pheromone structure. Parapheromones have shown a large variety of effects, and accordingly have been called agonists, pheromone mimics, synergists and hyperagonists, or else pheromone antagonists, antipheromones and inhibitors. Pheromone analogues have been used in quantitative structure-activity relationship studies of insect olfaction, and from a practical point of view they can replace pheromones when these are costly to prepare or unstable under field conditions.
Collapse
Affiliation(s)
- M Renou
- INRA, Unité de Phytopharmacie et Médiateurs Chimiques, Versailles, France.
| | | |
Collapse
|
15
|
Boger DL, Sato H, Lerner AE, Austin BJ, Patterson JE, Patricelli MP, Cravatt BF. Trifluoromethyl ketone inhibitors of fatty acid amide hydrolase: a probe of structural and conformational features contributing to inhibition. Bioorg Med Chem Lett 1999; 9:265-70. [PMID: 10021942 DOI: 10.1016/s0960-894x(98)00734-3] [Citation(s) in RCA: 86] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The examination of a series of trifluoromethyl ketone inhibitors of Fatty Acid Amide Hydrolase (FAAH, oleamide hydrolase, anandamide amidohydrolase) is detailed in efforts that define structural and conformational properties that contribute to enzyme inhibition and substrate binding. The results imply an extended bound conformation, highlight a role for the presence, position, and stereochemistry of a delta cis double bond, and suggest little apparent role for C11-C18/C22 of the fatty acid amide substrates.
Collapse
Affiliation(s)
- D L Boger
- Department of Chemistry, Skaggs Institute for Chemical Biology, Scripps Research Institute, La Jolla, California 92037, USA
| | | | | | | | | | | | | |
Collapse
|
16
|
Petschen I, Malo EA, Bosch M, Guerrero A. Highly enantioselective synthesis of long chain alkyl trifluoromethyl carbinols and β-thiotrifluoromethyl carbinols through lipases. ACTA ACUST UNITED AC 1996. [DOI: 10.1016/0957-4166(96)00256-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
17
|
Feixas J, Prestwich GD, Guerrero A. Ligand specificity of pheromone-binding proteins of the processionary moth. EUROPEAN JOURNAL OF BIOCHEMISTRY 1995; 234:521-6. [PMID: 8536698 DOI: 10.1111/j.1432-1033.1995.521_b.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Photoaffinity labeling of proteins extracted from sensory hairs and antennal branches of the processionary moth Thaumetopoea pityocampa with a tritium-labeled diazoacetate analogue of the sex pheromone (Z)-13-hexadecen-11-ynyl acetate revealed a 15-kDa pheromone-binding protein in male moth sensory hairs (SH-15). A different 15-kDa protein in male antennal branches (B-15) was not photolabeled. All extracts except male sensory hairs showed a photolabeled 20-kDa protein; a photolabeled male 30-kDa protein in the branches (B-30) was also observed. The 20-kDa proteins in the sensory hairs (SH-20) and branches (B-20) showed differing affinities for the photoaffinity analogues; moreover, SH-15 exhibits higher affinity for the natural pheromone, (Z)-13-hexadecen-11-ynyl acetate, than for its alcohol metabolite and other analogues in competitive displacement experiments. The affinity shown by the pheromone-binding protein for the metabolic product suggests that the alcohol may be also transported by the binding protein. Interestingly, a shift in labeling from SH-15 to SH-20 was produced in the presence of an excess of the natural pheromone, its alcohol and other analogues. The binding showed little discrimination among structurally similar analogues of the pheromone, while saturated and aromatic molecules showed little affinity for the proteins of either sensory hairs or antennal branches.
Collapse
Affiliation(s)
- J Feixas
- Department of Biological Organic Chemistry, Consejo Superior de Investigaciones Científicas, Barcelona, Spain
| | | | | |
Collapse
|
18
|
Gaspar J, Guerrero A. Lipase-catalysed enantioselective synthesis of naphthyl trifluoromethyl carbinols and their corresponding non-fluorinated counterparts. ACTA ACUST UNITED AC 1995. [DOI: 10.1016/0957-4166(94)00379-p] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
19
|
Villuendas I, Parrilla A, Guerrero A. An efficient and expeditious synthesis of functionalized trifluoromethyl ketones through lithium-iodine exchange reaction. Tetrahedron 1994. [DOI: 10.1016/s0040-4020(01)89400-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|