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Raspotnig G, Hüfner A, Bodner M, Blesl J, Schaider M, Escalante I, Kunert O. Polymorphic scent gland secretions in Nelima harvestmen: “Sclerosomatid compounds” but different chemical lineages. Front Ecol Evol 2022. [DOI: 10.3389/fevo.2022.993368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The scent glands of harvestmen (Opiliones) produce secretions of taxon-specific composition. One class of compounds, assumed to be a key group in opilionid chemosystematics and prevalent among sclerosomatid Eupnoi, was termed “sclerosomatid compounds” (SCs). Known compounds of this group comprise acyclic 4-methyl-branched ethyl-ketones and -alcohols as well as 2,4-dimethyl-branched primary alcohols and aldehydes, originally described from several species of North American Leiobuninae. We analyzed the scent gland secretions of Nelima ssp. (Sclerosomatidae, Leiobuninae) from two continents by gas chromatography-mass spectrometry, NMR, stereoselective synthesis, and chiral chromatography. We found a surprising chemical dichotomy: while North American N. paesserli produced typical acyclic SCs such as (E)-4-methyl-4-hexen-3-one, the secretions of European Nelima species exhibited a mixture of aromatic and aliphatic compounds, namely (R)-2-methyl-1-phenyl-pentan-3-one (MPP), 4-phenyl-2-butanone (PB), 2-phenylacetamide (PA), as well as (2R,4R)-2,4-dimethylhexanoic acid (DHA), all of which are new for the secretions of harvestmen. Remarkably, in N. sempronii, the secretions of juveniles (containing PB) differed from the secretions of adults (containing MPP and DHA). Though the chemistry of European Nelima species clearly diverged at first sight, all compounds detected either possess specific chemical motifs that allow an assignment to the class of SCs or appear to be biochemically/ontogenetically connected to SC-components. Thus, we here add novel compounds to the pool of SCs along with an extension of the definition of SCs to include aromatic compounds with SC-motifs. Furthermore, we describe a first case of juvenile-adult polymorphism for the exocrine secretions of harvestmen and provide a scheme of how secretions are regenerated.
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Sasano Y, Yamaichi A, Sasaki R, Nagasawa S, Iwabuchi Y. Expansion of Substrate Scope for Nitroxyl Radical/Copper-Catalyzed Aerobic Oxidation of Primary Alcohols: A Guideline for Catalyst Selection. Chem Pharm Bull (Tokyo) 2021; 69:488-497. [PMID: 33952858 DOI: 10.1248/cpb.c21-00043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Four distinctive sets of optimum nitroxyl radical/copper salt/additive catalyst combinations have been identified for accommodating the aerobic oxidation of various types of primary alcohols to their corresponding aldehydes. Interestingly, less nucleophilic catalysts exhibited higher catalytic activities for the oxidation of particular primary allylic and propargylic alcohols to give α,β-unsaturated aldehydes that function as competent Michael acceptors. The optimum conditions identified herein were successful in the oxidation of various types of primary alcohols, including unprotected amino alcohols and divalent-sulfur-containing alcohols in good-to-high yields. Moreover, N-protected alaninol, an inefficient substrate in the nitroxyl radical/copper-catalyzed aerobic oxidation, was oxidized in good yield. On the basis of the optimization results, a guideline for catalyst selection has been established.
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Affiliation(s)
- Yusuke Sasano
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University
| | - Aoto Yamaichi
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University
| | - Ryota Sasaki
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University
| | - Shota Nagasawa
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University
| | - Yoshiharu Iwabuchi
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University
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Gudmundsson HG, Kuper CJ, Cornut D, Urbitsch F, Elbert BL, Anderson EA. Synthesis of Cyclic Alkenyl Dimethylsiloxanes from Alkynyl Benzyldimethylsilanes and Application in Polyene Synthesis. J Org Chem 2019; 84:14868-14882. [PMID: 31646859 DOI: 10.1021/acs.joc.9b01664] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cyclic dimethylalkenylsiloxanes, useful motifs for (Z)-selective Hiyama cross-coupling, are accessed from alkynyl benzyldimethylsilanes featuring adjacent allylic or homoallylic oxygen substituents by semihydrogenation/debenzylation/cyclization. While formation of 5- and 6-membered rings can be achieved from the free alcohols using fluoride or silanolate, allylic acetate precursors to 5-membered rings display distinct modes of activation. The utility of these compounds is demonstrated through the preparation of a variety of (Z)-alkene-containing polyenes and application to a concise total synthesis of leukotriene B3.
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Affiliation(s)
| | - Christian J Kuper
- Chemistry Research Laboratory , 12 Mansfield Road , Oxford OX1 3TA , U.K
| | - Damien Cornut
- Chemistry Research Laboratory , 12 Mansfield Road , Oxford OX1 3TA , U.K
| | - Felix Urbitsch
- Chemistry Research Laboratory , 12 Mansfield Road , Oxford OX1 3TA , U.K
| | - Bryony L Elbert
- Chemistry Research Laboratory , 12 Mansfield Road , Oxford OX1 3TA , U.K
| | - Edward A Anderson
- Chemistry Research Laboratory , 12 Mansfield Road , Oxford OX1 3TA , U.K
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Park J, Chen DYK. A Desymmetrization-Based Total Synthesis of Reserpine. Angew Chem Int Ed Engl 2018; 57:16152-16156. [PMID: 30407710 DOI: 10.1002/anie.201810974] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2018] [Indexed: 11/10/2022]
Abstract
Reported herein is a desymmetrization-based synthetic approach to the fused polycyclic indole alkaloid reserpine. The centerpiece of the developed strategy features an internal desymmetrization process that enabled the use of a readily accessible and nonstereogenic reserpine E-ring precursor, in contrast to the synthesis-intensive and stereodefined E-ring intermediates employed in all past reserpine syntheses. Utilization of inexpensive reagents through an orchestrated sequence of carefully selected chemical transformations further highlight the overall effectiveness of the developed pathway.
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Affiliation(s)
- Jisook Park
- Department of Chemistry, Seoul National University, Gwanak-1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
| | - David Y-K Chen
- Department of Chemistry, Seoul National University, Gwanak-1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
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Affiliation(s)
- Jisook Park
- Department of ChemistrySeoul National University Gwanak-1 Gwanak-ro, Gwanak-gu Seoul 08826 South Korea
| | - David Y.‐K. Chen
- Department of ChemistrySeoul National University Gwanak-1 Gwanak-ro, Gwanak-gu Seoul 08826 South Korea
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6
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Bourkhis M, Gaspard H, Rullière P, de Almeida DKC, Listunov D, Joly E, Abderrahim R, de Mattos MC, de Oliveira MCF, Maraval V, Chauvin R, Génisson Y. Skeletal Optimization of Cytotoxic Lipidic Dialkynylcarbinols. ChemMedChem 2018; 13:1124-1130. [PMID: 29603643 DOI: 10.1002/cmdc.201800118] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Revised: 03/22/2018] [Indexed: 11/07/2022]
Abstract
In line with a recent study of the pharmacological potential of bioinspired synthetic acetylenic lipids, after identification of the terminal dialkynylcarbinol (DAC) and butadiynyl alkynylcarbinol (BAC) moieties as functional antitumor pharmacophoric units, this work specifically addresses the issue of carbon backbone length. A systematic variation of the aliphatic chain length was thus carried out in both the DAC and BAC series. The critical impact of the length of the lipidic skeleton was first confirmed in the racemic series, with the highest cytotoxic activity observed for C17 to C18 backbones. Enantiomerically enriched samples were prepared by asymmetric synthesis of the optimal C18 DAC and C17 BAC derivatives. Samples with upgraded enantiomeric purity were alternatively produced by enzymatic kinetic resolution. Eutomers possessing the S configuration displayed cytotoxicity IC50 values as low as 15 nm against HCT116 cancer cells, the highest level of activity reached to date in this series.
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Affiliation(s)
- Maroua Bourkhis
- SPCMIB, UMR-CNRS 5068, Université Paul Sabatier-Toulouse III, 118 route de Narbonne, 31062, Toulouse Cedex 9, France.,05/UR/13-01, LPMLNMH, Carthage University, Faculty of Sciences of Bizerte, 7021, Jarzouna, Tunisia
| | - Hafida Gaspard
- SPCMIB, UMR-CNRS 5068, Université Paul Sabatier-Toulouse III, 118 route de Narbonne, 31062, Toulouse Cedex 9, France
| | - Pauline Rullière
- SPCMIB, UMR-CNRS 5068, Université Paul Sabatier-Toulouse III, 118 route de Narbonne, 31062, Toulouse Cedex 9, France
| | - Diana K C de Almeida
- Laboratory of Biotechnology and Organic Synthesis, Federal University of Ceará, Campus do Pici, Fortaleza, Ceará, Brazil
| | - Dymytrii Listunov
- SPCMIB, UMR-CNRS 5068, Université Paul Sabatier-Toulouse III, 118 route de Narbonne, 31062, Toulouse Cedex 9, France.,LCC-CNRS, Université de Toulouse, CNRS, UPS, Toulouse, France
| | - Etienne Joly
- Institute of Pharmacology and Structural Biology, UMR5089 CNRS/UPS, Department of Structural Biology and Biophysics, Université Paul Sabatier-Toulouse III, 205 route de Narbonne, 31077, Toulouse Cedex 4, France
| | - Raoudha Abderrahim
- 05/UR/13-01, LPMLNMH, Carthage University, Faculty of Sciences of Bizerte, 7021, Jarzouna, Tunisia
| | - Marcos C de Mattos
- Laboratory of Biotechnology and Organic Synthesis, Federal University of Ceará, Campus do Pici, Fortaleza, Ceará, Brazil
| | - Maria C F de Oliveira
- Laboratory of Biotechnology and Organic Synthesis, Federal University of Ceará, Campus do Pici, Fortaleza, Ceará, Brazil
| | - Valérie Maraval
- LCC-CNRS, Université de Toulouse, CNRS, UPS, Toulouse, France
| | - Remi Chauvin
- LCC-CNRS, Université de Toulouse, CNRS, UPS, Toulouse, France
| | - Yves Génisson
- SPCMIB, UMR-CNRS 5068, Université Paul Sabatier-Toulouse III, 118 route de Narbonne, 31062, Toulouse Cedex 9, France
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Malik G, Swyka RA, Tiwari VK, Fei X, Applegate GA, Berkowitz DB. A thiocyanopalladation/carbocyclization transformation identified through enzymatic screening: stereocontrolled tandem C-SCN and C-C bond formation. Chem Sci 2017; 8:8050-8060. [PMID: 29568453 PMCID: PMC5855125 DOI: 10.1039/c7sc04083k] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Accepted: 09/29/2017] [Indexed: 12/31/2022] Open
Abstract
Herein we describe a formal thiocyanopalladation/carbocyclization transformation and its parametrization and optimization using a new elevated temperature plate-based version of our visual colorimetric enzymatic screening method for reaction discovery. The carbocyclization step leads to C-SCN bond formation in tandem with C-C bond construction and is highly stereoselective, showing nearly absolute 1,2-anti-stereoinduction (5 examples) for substrates bearing allylic substitution, and nearly absolute 1,3-syn-stereoinduction (16 examples) for substrates bearing propargylic substitution. Based upon these high levels of stereoinduction, the dependence of the 1,2-stereoinduction upon cyclization substrate geometry, and the generally high preference for the transoid vinyl thiocyanate alkene geometry, a mechanistic model is proposed, involving (i) Pd(ii)-enyne coordination, (ii) thiocyanopalladation, (iii) migratory insertion and (iv) β-elimination. Examples of transition metal-mediated C-SCN bond formation that proceed smoothly on unactivated substrates and allow for preservation of the SCN moiety are lacking. Yet, the thiocyanate functionality is of great value for biophysical chemistry (vibrational Stark effect) and medicinal chemistry (S,N-heterocycle construction). The title transformation accommodates C-, O-, N- and S-bridged substrates (6 examples), thereby providing the corresponding carbocyclic or heterocyclic scaffolds. The reaction is also shown to be compatible with a significant range of substituents, varying in steric and electronic demand, including a wide range of substituted aromatics, fused bicyclic and heterocyclic systems, and even biaryl systems. Combination of this new transformation with asymmetric allylation and Grubbs ring-closing metathesis provides for a streamlined enantio- and diastereoselective entry into the oxabicyclo[3.2.1]octyl core of the natural products massarilactone and annuionone A, as also evidenced by low temperature X-ray crystal structure determination. Utilizing this bicyclic scaffold, we demonstrate the versatility of the thiocyanate moiety for structural diversification post-cyclization. Thus, the bridging vinyl thiocyanate moiety is smoothly elaborated into a range of derivative functionalities utilizing transformations that cleave the S-CN bond, add the elements of RS-CN across a π-system and exploit the SCN moiety as a cycloaddition partner (7 diverse examples). Among the new functionalities thereby generated are thiotetrazole and sulfonyl tetrazole heterocycles that serve as carboxylate and phosphate surrogates, respectively, highlighting the potential of this approach for future applications in medicinal chemistry or chemical biology.
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Affiliation(s)
- G Malik
- Department of Chemistry , University of Nebraska , Lincoln , NE 68588 , USA .
| | - R A Swyka
- Department of Chemistry , University of Nebraska , Lincoln , NE 68588 , USA .
| | - V K Tiwari
- Department of Chemistry , University of Nebraska , Lincoln , NE 68588 , USA .
| | - X Fei
- Department of Chemistry , University of Nebraska , Lincoln , NE 68588 , USA .
| | - G A Applegate
- Department of Chemistry , University of Nebraska , Lincoln , NE 68588 , USA .
| | - D B Berkowitz
- Department of Chemistry , University of Nebraska , Lincoln , NE 68588 , USA .
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Singh RM, Nandini D, Bharadwaj KC, Gupta T, Singh RP. Na2S-mediated synthesis of terminal alkynes from gem-dibromoalkenes. Org Biomol Chem 2017; 15:9979-9982. [DOI: 10.1039/c7ob02431b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Na2S-mediated facile synthesis of terminal alkynes from gem-dibromoalkenes, at 20/40 °C under open flask conditions has been developed.
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Affiliation(s)
- Radhey M. Singh
- Department of Chemistry
- Institute of Science
- Banaras Hindu University
- Varanasi
- India
| | - Durgesh Nandini
- Department of Chemistry
- Institute of Science
- Banaras Hindu University
- Varanasi
- India
| | | | - Tanu Gupta
- Department of Chemistry
- Institute of Science
- Banaras Hindu University
- Varanasi
- India
| | - Raj Pal Singh
- Centre for Fire Explosive and Environment Safety
- Defence Research Development Organization
- Delhi
- India
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Koukal P, Ulč J, Nečas D, Kotora M. Enantioselective Allylation of β-Haloacrylaldehydes: Formal Total Syntheses of Pteroenone and Antillatoxin. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600286] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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10
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Kurosawa F, Nakano T, Soeta T, Endo K, Ukaji Y. (Z)-Selective Enol Triflation of α-Alkoxyacetoaldehydes: Application to Synthesis of (Z)-Allylic Alcohols via Cross-Coupling Reaction and [1,2]-Wittig Rearrangement. J Org Chem 2015; 80:5696-703. [PMID: 25970239 DOI: 10.1021/acs.joc.5b00647] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The stereoselective transformation of α-alkoxyacetoaldehydes to the corresponding (Z)-vinyl triflates was achieved by treatment with phenyl triflimide and DBU. The stereochemistry was explained by the "syn-effect," which was attributed primarily to an σ → π* interaction. The β-alkoxy vinyl triflates obtained were applied to the stereoselective synthesis of structurally diverse (Z)-allylic alcohols via transition metal-catalyzed cross-coupling reaction and [1,2]-Wittig rearrangement.
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Affiliation(s)
- Fumiya Kurosawa
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
| | - Takeo Nakano
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
| | - Takahiro Soeta
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
| | - Kohei Endo
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
| | - Yutaka Ukaji
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
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The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2013. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2014.09.021] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Liu S, Chen X, Hu Y, Yuan L, Chen S, Wu P, Wang W, Zhang S, Zhang W. An Efficient Method for the Production of Terminal Alkynes from 1,1-Dibromo-1-alkenes and its Application in the Total Synthesis of Natural Product Dihydroxerulin. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201400782] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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13
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Walleser P, Brückner R. Stereocontrolled Synthesis of a C1-C10Building Block (“Southwestern Moiety”) for the Unnatural Enantiomers of the Polyene Polyol Antibiotics Filipin III and Pentamycin: A Sultone-Forming Ring-Closing Metathesis for Protection of Homoallylic Alcohols. European J Org Chem 2014. [DOI: 10.1002/ejoc.201400145] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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