1
|
Xu B, Tantillo DJ, Rudolf JD. Mechanistic Insights into the Formation of the 6,10‐Bicyclic Eunicellane Skeleton by the Bacterial Diterpene Synthase Bnd4. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202109641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Baofu Xu
- Department of Chemistry University of Florida Gainesville FL 32611 USA
| | - Dean J. Tantillo
- Department of Chemistry University of California-Davis Davis CA 95616 USA
| | - Jeffrey D. Rudolf
- Department of Chemistry University of Florida Gainesville FL 32611 USA
| |
Collapse
|
2
|
Xu B, Tantillo DJ, Rudolf JD. Mechanistic Insights into the Formation of the 6,10-Bicyclic Eunicellane Skeleton by the Bacterial Diterpene Synthase Bnd4. Angew Chem Int Ed Engl 2021; 60:23159-23163. [PMID: 34378291 PMCID: PMC8511055 DOI: 10.1002/anie.202109641] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Indexed: 11/05/2022]
Abstract
The eunicellane diterpenoids are a unique family of natural products seen in marine organisms, plants, and bacteria. We used a series of biochemical, bioinformatics, and theoretical experiments to investigate the mechanism of the first diterpene synthase known to form the eunicellane skeleton. Deuterium labeling studies and quantum chemical calculations support that Bnd4, from Streptomyces sp. (CL12-4), forms the 6,10-bicyclic skeleton through a 1,10-cyclization, 1,3-hydride shift, and 1,14-cyclization cascade. Bnd4 also demonstrated sesquiterpene cyclase activity and the ability to prenylate small molecules. Bnd4 possesses a unique D94 NxxxD motif and mutation experiments confirmed an absolute requirement for D94 as well as E169.
Collapse
Affiliation(s)
- Baofu Xu
- Department of Chemistry, University of Florida, Gainesville, FL, 32611, USA
| | - Dean J Tantillo
- Department of Chemistry, University of California-Davis, Davis, CA, 95616, USA
| | - Jeffrey D Rudolf
- Department of Chemistry, University of Florida, Gainesville, FL, 32611, USA
| |
Collapse
|
3
|
Shirahata K, Takashika M, Hirabayashi K, Hasegawa M, Otani H, Yamamoto K, Ie Y, Shimizu T, Aoyagi S, Iyoda M. Reduction of Ethynylenes to Vinylenes in a Macrocyclic π-Extended Thiophene Skeleton Under McMurry Coupling Conditions. J Org Chem 2021; 86:302-309. [PMID: 33290650 DOI: 10.1021/acs.joc.0c02080] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
McMurry coupling is one of the most useful and convenient tools for the preparation of π-conjugated molecules. However, for the synthesis of strained macrocycles containing ethynylene linkages, reduction of ethynylene to vinylene linkage sometimes took place. Especially, for the synthesis of macrocyclic π-extended thiophene hexamers using McMurry coupling of dialdehyde 1 composed of three thienylene, two ethynylene, and two formyl groups, reduction of ethynylenes to vinylenes often takes place to produce unique products in a one-pot procedure, depending on very small steric and electronic effects such as reaction temperature, amounts of titanium reagent, and substituents of thiophene hexamers. The attractive structures and functional properties of reduced thiophene hexamers have been determined using X-ray analysis and OFET measurements.
Collapse
Affiliation(s)
- Keigo Shirahata
- Graduate School of Environment and Information Sciences, Yokohama National University, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Masataka Takashika
- Graduate School of Environment and Information Sciences, Yokohama National University, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Kazunori Hirabayashi
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Masashi Hasegawa
- School of Science, Kitasato University, Sagamihara, Kanagawa 252-0373, Japan
| | - Hiroyuki Otani
- Graduate School of Environment and Information Sciences, Yokohama National University, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Keitaro Yamamoto
- The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - Yutaka Ie
- The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - Toshio Shimizu
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Shinobu Aoyagi
- Department of Information and Basic Science, Nagoya City University, Nagoya 467-8501, Japan
| | - Masahiko Iyoda
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| |
Collapse
|
4
|
Frichert A, Jones PG, Lindel T. Synthesis of eunicellane-type bicycles embedding a 1,3-cyclohexadiene moiety. Beilstein J Org Chem 2018; 14:2461-2467. [PMID: 30344769 PMCID: PMC6176824 DOI: 10.3762/bjoc.14.222] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2018] [Accepted: 09/05/2018] [Indexed: 11/23/2022] Open
Abstract
The first synthesis of diterpenoid eunicellane skeletons incorporating a 1,3-cyclohexadiene moiety is presented. Key step is a low-valent titanium-induced pinacol cyclization that proved to be perfectly diastereoselective. Determination of the relative configuration of the diol was aided by the conversion to the diastereomer by oxidation and reduction. Conformational analysis of some of the resulting diols obtained under McMurry conditions was complicated by the presence of several conformers of similar energy. The pinacol coupling appears to start at the ketone, as indicated by the selective reduction of non-cyclizing cyclohexane systems that were synthesized from limonene oxide. The title compounds and their synthetic precursors are prone to aromatization on contact with air oxygen. Attempted synthesis of cyclohexene-containing eunicellane bicycles by elimination of water from tertiary alkynyl carbinols afforded novel allene systems. Our study may be of help towards the total synthesis of solenopodin or klysimplexin derivatives.
Collapse
Affiliation(s)
- Alex Frichert
- Institute of Organic Chemistry, TU Braunschweig, Hagenring 30, 38106 Braunschweig, Germany, Fax: (+49) 531-391-7744
| | - Peter G Jones
- Institute of Inorganic and Analytical Chemistry, TU Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Thomas Lindel
- Institute of Organic Chemistry, TU Braunschweig, Hagenring 30, 38106 Braunschweig, Germany, Fax: (+49) 531-391-7744
| |
Collapse
|
5
|
Breman AC, van der Heijden G, van Maarseveen JH, Ingemann S, Hiemstra H. Synthetic and Organocatalytic Studies of Quinidine Analogues with Ring-Size Modifications in the Quinuclidine Moiety. Chemistry 2016; 22:14247-56. [PMID: 27531315 DOI: 10.1002/chem.201601917] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Indexed: 11/07/2022]
Abstract
Six highly enantiopure analogues of [2.2.2] were synthesized with five- or seven-membered rings in the (original) quinuclidine skeleton. Five of these compounds were prepared through epoxide opening by a secondary cyclic amine, providing the nor- and homoquinuclidine moieties through five- and six-membered ring formation. This method failed in the case of seven-membered ring formation, so for that particular ring size a different synthetic route starting from 3-quinuclidone was applied. The six novel analogues were examined as organocatalysts in four asymmetric conjugate addition reactions and the results compared with those of known cinchona alkaloid catalysts. This study shows that modification of the quinuclidine ring can have a substantial influence on catalyst activity and enantioselectivity. To acquire more insight into the characteristics of the new catalysts, the pKaH values were determined by means of fluorescence spectroscopy. Furthermore, relative reaction rates of conjugate thiol additions reactions catalyzed by these quinidine analogues were measured through polarimetry.
Collapse
Affiliation(s)
- Arjen C Breman
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Gydo van der Heijden
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Jan H van Maarseveen
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Steen Ingemann
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Henk Hiemstra
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands.
| |
Collapse
|
6
|
Frichert A, Jones PG, Lindel T. Enantioselektive Totalsynthese der Terreumole A und C aus dem Pilz Tricholoma terreum. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201510709] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Alex Frichert
- Institut für Organische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Deutschland
| | - Peter G. Jones
- Institut für Anorganische und Analytische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Deutschland
| | - Thomas Lindel
- Institut für Organische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Deutschland
| |
Collapse
|
7
|
Frichert A, Jones PG, Lindel T. Enantioselective Total Synthesis of Terreumols A and C from the Mushroom Tricholoma terreum. Angew Chem Int Ed Engl 2016; 55:2916-9. [DOI: 10.1002/anie.201510709] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Indexed: 11/09/2022]
Affiliation(s)
- Alex Frichert
- Institute of Organic Chemistry; Technical University Braunschweig; Hagenring 30 38106 Braunschweig Germany
| | - Peter G. Jones
- Institute of Inorganic and Analytical Chemistry; Technical University Braunschweig; Hagenring 30 38106 Braunschweig Germany
| | - Thomas Lindel
- Institute of Organic Chemistry; Technical University Braunschweig; Hagenring 30 38106 Braunschweig Germany
| |
Collapse
|
8
|
Yang ZH, Chen ZH, An YL, Zhao SY. Selective and tunable synthesis of 3-arylsuccinimides and 3-arylmaleimides from arenediazonium tetrafluoroborates and maleimides. RSC Adv 2016. [DOI: 10.1039/c6ra00136j] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
A highly efficient and tunable synthetic strategy for 3-arylsuccinimides or 3-arylmaleimides has been developed from arenediazonium tetrafluoroborates and maleimides with satisfactory yields in the presence of TiCl3 or CuCl.
Collapse
Affiliation(s)
- Zhen-Hua Yang
- Department of Chemistry
- Donghua University
- Shanghai 201620
- P. R. of China
| | - Zhong-Hui Chen
- Department of Chemistry
- Donghua University
- Shanghai 201620
- P. R. of China
| | - Yu-Long An
- Department of Chemistry
- Donghua University
- Shanghai 201620
- P. R. of China
| | - Sheng-Yin Zhao
- Department of Chemistry
- Donghua University
- Shanghai 201620
- P. R. of China
- State Key Laboratory of Bioorganic & Natural Products Chemistry
| |
Collapse
|
9
|
Yoshimura A, Saeki T, Nomoto A, Ogawa A. Pinacol couplings of a series of aldehydes and ketones with SmI2/Sm/Me3SiCl in DME. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.06.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|