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Ellinwood DC, El-Mansy MF, Plagmann LS, Stevens JF, Maier CS, Gombart AF, Blakemore PR. Total synthesis of [ 13 C] 2 -, [ 13 C] 3 -, and [ 13 C] 5 -isotopomers of xanthohumol, the principal prenylflavonoid from hops. J Labelled Comp Radiopharm 2017; 60:639-648. [PMID: 28984993 DOI: 10.1002/jlcr.3571] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Revised: 08/31/2017] [Accepted: 09/26/2017] [Indexed: 11/12/2022]
Abstract
Xanthohumol [(E)-6'-methoxy-3'-(3-methylbuten-2-yl)-2',4',4″-trihydroxychalcone], he principal prenylated flavonoid from hops, has a complex bioactivity profile, and 13 C-labeled isotopomers of this compound are of potential use as molecular probes and as analytical standards to study metabolism and mode of action. 1,3-[13 C]2 -Xanthohumol was prepared by an adaptation of the total synthesis of Khupse and Erhardt in 7 steps and 5.7% overall yield from phloroglucinol by a route incorporating a cascade Claisen-Cope rearrangement to install the 3'-prenyl moiety from a 5'-prenyl aryl ether and an aldol condensation between 1-[13 C]-2',4'-bis(benzyloxymethyloxy)-6'-methoxy-3'-(3-methylbuten-2-yl)acetophenone and 1'-[13 C]-4-(methoxymethyloxy)benzaldehyde. The 13 C-atom in the methyl ketone was derived from 1-[13 C]-acetyl chloride while that in the aryl aldehyde was derived from [13 C]-iodomethane. Tri- and penta-13 C-labeled xanthohumols were similarly prepared by applying minor modifications to the route.
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Affiliation(s)
| | - Mohamed F El-Mansy
- Department of Chemistry, Oregon State University, Corvallis, OR, USA.,National Research Centre, Department of Organometallic and Organometalloid Chemistry, Cairo, Dokki, Egypt
| | - Layhna S Plagmann
- Department of Chemistry, Oregon State University, Corvallis, OR, USA
| | - Jan F Stevens
- Linus Pauling Institute, Oregon State University, Corvallis, OR, USA.,Department of Pharmaceutical Sciences, Oregon State University, Corvallis, OR, USA
| | - Claudia S Maier
- Department of Chemistry, Oregon State University, Corvallis, OR, USA
| | - Adrian F Gombart
- Linus Pauling Institute, Oregon State University, Corvallis, OR, USA.,Department of Biochemistry and Biophysics, Oregon State University, Corvallis, OR, USA
| | - Paul R Blakemore
- Department of Chemistry, Oregon State University, Corvallis, OR, USA
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Parr BT, Davies HML. Rhodium-catalyzed tandem cyclopropanation/ Cope rearrangement of 4-alkenyl-1-sulfonyl-1,2,3-triazoles with dienes. Angew Chem Int Ed Engl 2013; 52:10044-7. [PMID: 23913819 DOI: 10.1002/anie.201304310] [Citation(s) in RCA: 109] [Impact Index Per Article: 9.9] [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: 05/19/2013] [Indexed: 11/09/2022]
Abstract
Take your pick… A practical method for the synthesis of structurally diverse rhodium vinylcarbenes from stable 1-sulfonyl-1,2,3-triazole precursors has been developed. The reaction is general for a broad range of 4-alkenyl triazoles and dienes, enabling the stereoselective synthesis of a variety of polycyclic imines, which are readily converted into amines or aldehydes in a one-pot process.
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Affiliation(s)
- Brendan T Parr
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, GA 30322 (USA) http://www.chemistry.emory.edu/faculty/davies/Home.html
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González-Navarrete P, Andrés J, Berski S. How a Quantum Chemical Topology Analysis Enables Prediction of Electron Density Transfers in Chemical Reactions. The Degenerated Cope Rearrangement of Semibullvalene. J Phys Chem Lett 2012; 3:2500-2505. [PMID: 26292140 DOI: 10.1021/jz300974v] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Recent works on the reaction mechanism for the degenerated Cope rearrangement (DCR) of semibullvalene (SBV) in the ground state prompted us to investigate this complex rearrangement in order to assign experimentally observed contrast features in the simulated electron distribution. We present a joint use of the electron localization function (ELF) and Thom's catastrophe theory (CT) as a powerful tool to analyze the electron density transfers along the DCR. The progress of the reaction is monitored by the structural stability domains of the topology of ELF, while the change between them is controlled by turning points derived from CT. The ELF topological analysis shows that the DCR of SBV corresponds to asynchronous electron density rearrangement taking place in three consecutive stages. We show how the pictures anticipated by drawing Lewis structures of the rearrangement correlate with the experimental data and time-dependent quantum description of the process.
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Affiliation(s)
| | - Juan Andrés
- †Departamento de Química Física y Analítica, Universitat Jaume I, 12071 Castelló de la Plana, Spain
| | - Slawomir Berski
- ‡Faculty of Chemistry, University of Wroclaw, F. Joliot-Curie 14, 50-383 Wroclaw, Poland
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Lian Y, Hardcastle KI, Davies HML. Computationally guided stereocontrol of the combined C-H functionalization/ Cope rearrangement. Angew Chem Int Ed Engl 2011; 50:9370-3. [PMID: 21948433 PMCID: PMC3397163 DOI: 10.1002/anie.201103568] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2011] [Indexed: 11/07/2022]
Abstract
Diastereoselectivity in control The combined C—H functionalization/Cope rearrangement (CHCR) is a highly diastereoselective process that typically proceeds through a chair transition state. A recent computational study of a model system for the CHCR reaction revealed that a boat transition state was only slightly less favored than a chair transition state. Guided by these computational results, this study describes the design of substrates that would react by means of a boat transition state. The resulting C—H functionalization products are the opposite diastereomeric series to what had been previously obtained with this chemistry.
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Affiliation(s)
- Yajing Lian
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia, 30322, Fax: (+1) 404-727-7766, Homepage: http://www.chemistry.emory.edu/
| | - Kenneth I. Hardcastle
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia, 30322, Fax: (+1) 404-727-7766, Homepage: http://www.chemistry.emory.edu/
| | - Huw M. L. Davies
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia, 30322, Fax: (+1) 404-727-7766, Homepage: http://www.chemistry.emory.edu/
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