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Callejo R, Corr MJ, Yang M, Wang M, Cordes DB, Slawin AMZ, O'Hagan D. Fluorinated Musk Fragrances: The CF2 Group as a Conformational Bias Influencing the Odour of Civetone and (R)-Muscone. Chemistry 2016; 22:8137-51. [PMID: 27149882 DOI: 10.1002/chem.201600519] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Indexed: 01/22/2023]
Abstract
The difluoromethylene (CF2 ) group has a strong tendency to adopt corner over edge locations in aliphatic macrocycles. In this study, the CF2 group has been introduced into musk relevant macrocyclic ketones. Nine civetone and five muscone analogues have been prepared by synthesis for structure and odour comparisons. X-ray studies indeed show that the CF2 groups influence ring structure and they give some insight into the preferred ring conformations, triggering a musk odour as determined in a professional perfumery environment. The historical conformational model of Bersuker and co-workers for musk fragrance generally holds, and structures that become distorted from this consensus, by the particular placement of the CF2 groups, lose their musk fragrance and become less pleasant.
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Affiliation(s)
- Ricardo Callejo
- School of Chemistry, University of St. Andrews, North Haugh, St. Andrews, KY16 9ST, UK
| | - Michael J Corr
- School of Chemistry, University of St. Andrews, North Haugh, St. Andrews, KY16 9ST, UK
| | - Mingyan Yang
- School of Chemistry, University of St. Andrews, North Haugh, St. Andrews, KY16 9ST, UK.,Department of Applied Chemistry, College of Science, China Agricultural University, No.2 Yuanmingyuan West Road, Haidian District, Beijing, 100193, China
| | - Mingan Wang
- Department of Applied Chemistry, College of Science, China Agricultural University, No.2 Yuanmingyuan West Road, Haidian District, Beijing, 100193, China
| | - David B Cordes
- School of Chemistry, University of St. Andrews, North Haugh, St. Andrews, KY16 9ST, UK
| | - Alexandra M Z Slawin
- School of Chemistry, University of St. Andrews, North Haugh, St. Andrews, KY16 9ST, UK
| | - David O'Hagan
- School of Chemistry, University of St. Andrews, North Haugh, St. Andrews, KY16 9ST, UK.
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Nolsøe JMJ, Aursnes M, Tungen JE, Hansen TV. Dienals Derived from Pyridinium Salts and Their Subsequent Application in Natural Product Synthesis. J Org Chem 2015; 80:5377-85. [DOI: 10.1021/acs.joc.5b00879] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Jens M. J. Nolsøe
- School of Pharmacy, Department
of Pharmaceutical Chemistry, University of Oslo, P.O. Box 1068 Blindern, N-0316 Oslo, Norway
| | - Marius Aursnes
- School of Pharmacy, Department
of Pharmaceutical Chemistry, University of Oslo, P.O. Box 1068 Blindern, N-0316 Oslo, Norway
| | - Jørn E. Tungen
- School of Pharmacy, Department
of Pharmaceutical Chemistry, University of Oslo, P.O. Box 1068 Blindern, N-0316 Oslo, Norway
| | - Trond V. Hansen
- School of Pharmacy, Department
of Pharmaceutical Chemistry, University of Oslo, P.O. Box 1068 Blindern, N-0316 Oslo, Norway
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Bannwarth P, Grée D, Aubert C, Grée R. A new synthesis of indanes with monofluorinated and gem-difluoroalkyl side chains. J Fluor Chem 2014. [DOI: 10.1016/j.jfluchem.2014.03.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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El Dine AN, Khalaf A, Grée D, Tasseau O, Fares F, Jaber N, Lesot P, Hachem A, Grée R. Synthesis of enones, pyrazolines and pyrrolines with gem-difluoroalkyl side chains. Beilstein J Org Chem 2013; 9:1943-8. [PMID: 24204405 PMCID: PMC3817575 DOI: 10.3762/bjoc.9.230] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Accepted: 09/06/2013] [Indexed: 01/04/2023] Open
Abstract
Starting from easily accessible gem-difluoropropargylic derivatives, a DBU-mediated isomerisation affords enones in fair yields with a gem-difluoroalkyl chain. These derivatives were used to prepare pyrazolines and pyrrolines with the desired gem-difluoroalkyl side chain by cyclocondensations in good yields and with excellent stereoselectivity. A one-pot process was also successfully developed for these sequential reactions. By carrying out various types of Pd-catalyzed coupling reactions for compounds with a p-bromophenyl substituent a route to focused chemical libraries was demonstrated.
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Affiliation(s)
- Assaad Nasr El Dine
- Université de Rennes 1, Institut des Sciences Chimiques de Rennes, CNRS UMR 6226, Avenue du Général Leclerc, 35042 Rennes Cedex, France ; Laboratory for Medicinal Chemistry and Natural Products, Lebanese University, Faculty of Sciences (1) and PRASE-EDST, Hadath, Beyrouth, Lebanon
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Giovanelli E, Moisan L, Comesse S, Leroux S, Rousseau B, Hellier P, Nicolas M, Doris E. Synthesis of fluorinated catharanthine analogues and investigation of their biomimetic coupling with vindoline. Org Biomol Chem 2013; 11:5885-91. [DOI: 10.1039/c3ob41170b] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Khalaf A, Grée D, Abdallah H, Jaber N, Hachem A, Grée R. Asymmetric Organocatalytic 1,4-Addition Reactions Starting from Enals withgem-Difluoroalkyl Side Chains. European J Org Chem 2012. [DOI: 10.1002/ejoc.201201427] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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The medicinal chemistry of stable synthetic leukotriene B3 and B4 analogues. Future Med Chem 2012; 4:1007-14. [DOI: 10.4155/fmc.12.53] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Leukotriene B3 and B4 are part of an important class of signaling molecules – the leukotrienes, implicated in the inflammation process. Their pro-inflammatory effects have been widely recognized for almost three decades but it is only recently that their benefit in host defense has begun to be acknowledged. Their use as therapeutic agents is, unfortunately, limited by rapid metabolism. However, over the past 25 years, a number of stable leukotriene B3 and B4 analogues have been produced. In this review, we examine their medicinal chemistry and biological evaluation.
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Towards chemical libraries based on heterocyclic scaffolds with monofluorinated and difluoroalkyl side chains. J Fluor Chem 2012. [DOI: 10.1016/j.jfluchem.2011.03.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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9
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Synthesis of new difluoroalkyl propargylic ketones and their use for the preparation of fluorinated heterocycles. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.02.116] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Grée D, Grée R. Effect of fluorine or oxygen atom(s) in propargylic position on the reactivity in click chemistry. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.02.083] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Bannwarth P, Valleix A, Grée D, Grée R. Flexible synthesis of pyrimidines with chiral monofluorinated and difluoromethyl side chains. J Org Chem 2009; 74:4646-9. [PMID: 19518154 DOI: 10.1021/jo900674u] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Chiral pyrimidines with a fluorine atom in the benzylic position are easily accessible in high enantiomeric excesses from optically active propargylic intermediates by two complementary routes. Both the use of optically active propargylic fluorides and the fluorination of the chiral pyrimidine in the final stage give excellent results in terms of enantiocontrol. On the other hand, original pyrimidines with a difluoromethyl side chain are also obtained in a few steps from new propargylic ketones bearing a CHF(2) substituent on the triple bond.
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Affiliation(s)
- Pierre Bannwarth
- Laboratoire de Chimie et Photonique Moléculaires, Université de Rennes 1, CNRS UMR 6510, France
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Blayo AL, Le Meur S, Grée D, Grée R. New Enantioselective Synthesis of Monofluorinated Pyridines Designed for the Preparation of Chemical Libraries. Adv Synth Catal 2008. [DOI: 10.1002/adsc.200700488] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Grée D, Grée R. A new strategy for the synthesis of optically active benzylic fluorides and corresponding five-membered heteroaromatic analogues. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.06.007] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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