1
|
Taber DF. Natural Product Synthesis by Intramolecular Alkylidene Carbene C−H Insertion. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Douglass F. Taber
- Department of Chemistry and Biochemistry University of Delaware Newark DE 19716 USA
| |
Collapse
|
2
|
Abazid AH, Nachtsheim BJ. Application of chiral triazole-substituted iodoarenes in the enantioselective construction of spirooxazolines. Chem Commun (Camb) 2021; 57:8822-8825. [PMID: 34382967 DOI: 10.1039/d1cc03246a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A catalytic highly enantioselective synthesis of spirooxazolines is presented. Starting from readily available 2-naphthol-substituted benzamides and using catalytic amounts of a chiral triazole-substituted iodoarene catalyst, a variety of spirooxazolines can be isolated through an enantioselective oxidative dearomatization in up to 92% yield and 97% ee. The further synthetic utility of the optically enriched spirooxazolines was examined providing a corresponding 2-naphthalenole and an oxepin.
Collapse
Affiliation(s)
- Ayham H Abazid
- University of Bremen, Institute of Organic and Analytical Chemistry, Leobener Straße 7, Bremen 28359, Germany.
| | | |
Collapse
|
3
|
Synthesis of Natural (-)-Antrocin and its Enantiomer via Stereoselective Aldol Reaction. Molecules 2020; 25:molecules25040831. [PMID: 32075004 PMCID: PMC7070359 DOI: 10.3390/molecules25040831] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 02/07/2020] [Accepted: 02/13/2020] [Indexed: 12/16/2022] Open
Abstract
The total synthesis of (-)-antrocin and its enantiomer are presented. Antrocin (-)-1 is an important natural product which acts as an antiproliferative agent in a metastatic breast cancer cell line (IC50: 0.6 μM). The key features of this synthesis are: (a) selective anti-addition of trimethylsilyl cyanide (TMSCN) to α,β-unsaturated ketone; (b) resolution of (±)-7 using chiral auxiliary L-dimethyl tartrate through formation of cyclic ketal diastereomers followed by simple column chromatography separation and acid hydrolysis; (c) substrate-controlled stereoselective aldol condensation of (+)-12 with monomeric formaldehyde and pyridinium chlorochromate (PCC) oxidation for synthesis of essential lactone core in (-)-14; and (d) non-basic Lombardo olefination of the carbonyl at the final step to yield (-)-antrocin. In addition, (+)-9 cyclic ketal diastereomer was converted to (+)-antrocin with similar reaction sequences.
Collapse
|
4
|
Yamashita Y, Maki D, Sakurai S, Fuse T, Matsumoto S, Akazome M. Preparation of chiral 3-oxocycloalkanecarbonitrile and its derivatives by crystallization-induced diastereomer transformation of ketals with chiral 1,2-diphenylethane-1,2-diol. RSC Adv 2018; 8:32601-32609. [PMID: 35547706 PMCID: PMC9086373 DOI: 10.1039/c8ra06611f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Accepted: 09/10/2018] [Indexed: 11/28/2022] Open
Abstract
Chiral 3-oxocycloalkanecarbonitriles were prepared by fractional crystallization and crystallization-induced diastereomer transformation (CIDT) of diastereomeric ketals with (1R,2R)-1,2-diphenylethane-1,2-diol. Investigation of the crystal structures by X-ray diffraction analysis revealed that the difference in hydrogen bonds caused the discrepancy of the solubilities between (R) and (S) diastereomers. Furthermore, CIDT to afford the (R)-diastereomer in good yield (95% yield) and with high diastereoselectivity (97% de) was accomplished, which is the first example of CIDT of neutral compounds via formation of the diastereomeric ketal with (1R,2R)-1,2-diphenylethane-1,2-diol. Chiral 3-oxocyclopentanecarbonitrile was prepared in good yield and with high diastereoselectivity by crystallization-induced diastereomer transformation of the corresponding diastereomeric ketal.![]()
Collapse
Affiliation(s)
- Yohei Yamashita
- Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University 1-33 Yayoicho, Inageku Chiba 263-8522 Japan .,Process Chemistry Labs. Pharmaceutical Technology, Astellas Pharma Inc. 160-2, Akahama Takahagi-shi Ibaraki 318-0001 Japan
| | - Daisuke Maki
- Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University 1-33 Yayoicho, Inageku Chiba 263-8522 Japan
| | - Shiho Sakurai
- Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University 1-33 Yayoicho, Inageku Chiba 263-8522 Japan
| | - Takumi Fuse
- Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University 1-33 Yayoicho, Inageku Chiba 263-8522 Japan
| | - Shoji Matsumoto
- Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University 1-33 Yayoicho, Inageku Chiba 263-8522 Japan
| | - Motohiro Akazome
- Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University 1-33 Yayoicho, Inageku Chiba 263-8522 Japan .,Molecular Chirality Research Center, Chiba University 1-33 Yayoicho, Inageku Chiba 263-8522 Japan
| |
Collapse
|
5
|
Affiliation(s)
| | - Giuseppe Zanoni
- Dipartimento di Chimica; Università di Pavia; Viale Taramelli 10 27100 Pavia Italy
| | - Debabrata Maiti
- Department of Chemistry; IIT Bombay; Powai Mumbai 400076 India
- Dipartimento di Chimica; Università di Pavia; Viale Taramelli 10 27100 Pavia Italy
| |
Collapse
|
6
|
Transition-metal-free chemo- and regioselective vinylation of azaallyls. Nat Chem 2017; 9:997-1004. [PMID: 28937664 DOI: 10.1038/nchem.2760] [Citation(s) in RCA: 79] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Accepted: 03/01/2017] [Indexed: 11/08/2022]
Abstract
Direct C(sp3)-C(sp2) bond formation under transition-metal-free conditions offers an atom-economical, inexpensive and environmentally benign alternative to traditional transition-metal-catalysed cross-coupling reactions. A new chemo- and regioselective coupling protocol between 3-aryl-substituted-1,1-diphenyl-2-azaallyl derivatives and vinyl bromides has been developed. This is the first transition-metal-free cross-coupling of azaallyls with vinyl bromide electrophiles and delivers allylic amines in excellent yields (up to 99%). This relatively simple and mild protocol offers a direct and practical strategy for the synthesis of high-value allylic amine building blocks that does not require the use of transition metals, special initiators or photoredox catalysts. Radical clock experiments, electron paramagnetic resonance studies and density functional theory calculations point to an unprecedented substrate-dependent coupling mechanism. Furthermore, an electron paramagnetic resonance signal was observed when the N-benzyl benzophenone ketimine was subjected to silylamide base, supporting the formation of radical species upon deprotonation. The unique mechanisms outlined herein could pave the way for new approaches to transition-metal-free C-C bond formations.
Collapse
|
7
|
Annadi K, Wee AGH. An Alkylidene Carbene C–H Activation Approach toward the Enantioselective Syntheses of Spirolactams: Application to the Synthesis of (−)-Adalinine. J Org Chem 2016; 81:1021-38. [DOI: 10.1021/acs.joc.5b02582] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Krishna Annadi
- Department
of Chemistry and
Biochemistry, University of Regina, Regina, Saskatchewan, S4S 0A2, Canada
| | - Andrew G. H. Wee
- Department
of Chemistry and
Biochemistry, University of Regina, Regina, Saskatchewan, S4S 0A2, Canada
| |
Collapse
|
8
|
Harizani M, Ioannou E, Roussis V. The Laurencia Paradox: An Endless Source of Chemodiversity. PROGRESS IN THE CHEMISTRY OF ORGANIC NATURAL PRODUCTS 2016; 102:91-252. [PMID: 27380407 DOI: 10.1007/978-3-319-33172-0_2] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Nature, the most prolific source of biological and chemical diversity, has provided mankind with treatments for health problems since ancient times and continues to be the most promising reservoir of bioactive chemicals for the development of modern drugs. In addition to the terrestrial organisms that still remain a promising source of new bioactive metabolites, the marine environment, covering approximately 70% of the Earth's surface and containing a largely unexplored biodiversity, offers an enormous resource for the discovery of novel compounds. According to the MarinLit database, more than 27,000 metabolites from marine macro- and microorganisms have been isolated to date providing material and key structures for the development of new products in the pharmaceutical, food, cosmeceutical, chemical, and agrochemical sectors. Algae, which thrive in the euphotic zone, were among the first marine organisms that were investigated as sources of food, nutritional supplements, soil fertilizers, and bioactive metabolites.Red algae of the genus Laurencia are accepted unanimously as one of the richest sources of new secondary metabolites. Their cosmopolitan distribution, along with the chemical variation influenced to a significant degree by environmental and genetic factors, have resulted in an endless parade of metabolites, often featuring multiple halogenation sites.The present contribution, covering the literature until August 2015, offers a comprehensive view of the chemical wealth and the taxonomic problems currently impeding chemical and biological investigations of the genus Laurencia. Since mollusks feeding on Laurencia are, in many cases, bioaccumulating, and utilize algal metabolites as chemical weaponry against natural enemies, metabolites of postulated dietary origin of sea hares that feed on Laurencia species are also included in the present review. Altogether, 1047 secondary metabolites, often featuring new carbocyclic skeletons, have been included.The chapter addresses: (1) the "Laurencia complex", the botanical description and the growth and population dynamics of the genus, as well as its chemical diversity and ecological relations; (2) the secondary metabolites, which are organized according to their chemical structures and are classified into sesquiterpenes, diterpenes, triterpenes, acetogenins, indoles, aromatic compounds, steroids, and miscellaneous compounds, as well as their sources of isolation which are depicted in tabulated form, and (3) the biological activity organized according to the biological target and the ecological functions of Laurencia metabolites.
Collapse
Affiliation(s)
- Maria Harizani
- Department of Pharmacognosy and Chemistry of Natural Products, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, Athens, 15771, Greece
| | - Efstathia Ioannou
- Department of Pharmacognosy and Chemistry of Natural Products, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, Athens, 15771, Greece.
| | - Vassilios Roussis
- Department of Pharmacognosy and Chemistry of Natural Products, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, Athens, 15771, Greece.
| |
Collapse
|
9
|
|
10
|
Chen HJ, Wu Y. Expeditious entry to the chamigrane endoperoxide family of natural products. Org Lett 2015; 17:592-5. [PMID: 25583367 DOI: 10.1021/ol503603t] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Several members of the recently reported peroxy chamigrane family of natural products were synthesized via a distereoselective route with a novel facial-selective epoxidation of a spiroundecadiene, a facile epoxide rearrangement, and a Co(II)-mediated silylperoxidation as the key steps. Adaptation of the diastereoselective route to an enantioselective one is also illustrated.
Collapse
Affiliation(s)
- Hui-Jun Chen
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences , 345 Lingling Road, Shanghai 200032, China
| | | |
Collapse
|
11
|
Smith LK, Baxendale IR. Total syntheses of natural products containing spirocarbocycles. Org Biomol Chem 2015; 13:9907-33. [DOI: 10.1039/c5ob01524c] [Citation(s) in RCA: 121] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The spiro motif is becoming an increasingly prevalent structure in medicinal and organic chemistry. The total syntheses of natural products containing all-carbon spirocycles is reviewed.
Collapse
|
12
|
Reekie TA, Banwell MG, Willis AC. Intramolecular Cycloaddition Reactions of cis-1,2-Dihydrocatechol Derivatives Incorporating C3-Tethered Diazoketones, Nitrile Oxides, and Azides: Stereocontrolled Routes to Enantiomerically Pure Spiro[5.5]undecanes and Related Systems. J Org Chem 2013; 78:7100-11. [DOI: 10.1021/jo400952u] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tristan A. Reekie
- Research School of Chemistry, Institute
of Advanced
Studies, The Australian National University, Canberra ACT 0200, Australia
| | - Martin G. Banwell
- Research School of Chemistry, Institute
of Advanced
Studies, The Australian National University, Canberra ACT 0200, Australia
| | - Anthony C. Willis
- Research School of Chemistry, Institute
of Advanced
Studies, The Australian National University, Canberra ACT 0200, Australia
| |
Collapse
|
13
|
Hsu DS, Juo BC. Intramolecular reductive cyclization of an enone–aldehyde: a new approach to the synthesis of (±)-majusculone. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.01.087] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
14
|
Funktionalisierung von C-H-Bindungen: neue Synthesemethoden für Naturstoffe und Pharmazeutika. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201201666] [Citation(s) in RCA: 756] [Impact Index Per Article: 63.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
|
15
|
Yamaguchi J, Yamaguchi AD, Itami K. CH Bond Functionalization: Emerging Synthetic Tools for Natural Products and Pharmaceuticals. Angew Chem Int Ed Engl 2012; 51:8960-9009. [DOI: 10.1002/anie.201201666] [Citation(s) in RCA: 2423] [Impact Index Per Article: 201.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2012] [Indexed: 01/04/2023]
|
16
|
Li BS, Zhang E, Zhang QW, Zhang FM, Tu YQ, Cao XP. One-Pot Construction of Multi-Substituted Spiro-Cycloalkanediones by an Organocatalytic Asymmetric Epoxidation/Semipinacol Rearrangement. Chem Asian J 2011; 6:2269-72. [DOI: 10.1002/asia.201100383] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2011] [Indexed: 11/05/2022]
|
17
|
|
18
|
Zheng JC, Yun SY, Sun C, Lee NK, Lee D. Selectivity Control in Alkylidene Carbene-Mediated C−H Insertion and Allene Formation. J Org Chem 2011; 76:1086-99. [PMID: 21244086 DOI: 10.1021/jo102180f] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Jun-Cheng Zheng
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607, United States
| | - Sang Young Yun
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607, United States
| | - Chunrui Sun
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607, United States
| | - Nam-Kyu Lee
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607, United States
| | - Daesung Lee
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607, United States
| |
Collapse
|
19
|
Pollini GP, Benetti S, De Risi C, Zanirato V. Hagemann's ester: a timeless building block for natural product synthesis. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.01.078] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
20
|
White DE, Stewart IC, Seashore-Ludlow BA, Grubbs RH, Stoltz BM. A general enantioselective route to the chamigrene natural product family. Tetrahedron 2010; 66:4668-4686. [PMID: 20798895 PMCID: PMC2925317 DOI: 10.1016/j.tet.2010.04.128] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Described in this report is an enantioselective route toward the chamigrene natural product family. The key disconnections in our synthetic approach include sequential enantioselective decarboxylative allylation and ring-closing olefin metathesis to form the all-carbon quaternary stereocenter and spirocyclic core present in all members of this class of compounds. The generality of this strategy is demonstrated by the first total syntheses of elatol and the proposed structure of laurencenone B, as well as the first enantioselective total syntheses of laurencenone C and α-chamigrene. A brief exploration of the substrate scope of the enantioselective decarboxylative allylation/ring-closing metathesis sequence with fully substituted vinyl chlorides is also presented.
Collapse
Affiliation(s)
- David E. White
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125
| | - Ian C. Stewart
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125
| | | | - Robert H. Grubbs
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125
| | - Brian M. Stoltz
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125
| |
Collapse
|
21
|
Yun SY, Zheng JC, Lee D. Stereoelectronic Effect for the Selectivity in C−H Insertion of Alkylidene Carbenes and Its Application to the Synthesis of Platensimycin. J Am Chem Soc 2009; 131:8413-5. [PMID: 19473019 DOI: 10.1021/ja903526g] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sang Young Yun
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607-7061
| | - Jun-Cheng Zheng
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607-7061
| | - Daesung Lee
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607-7061
| |
Collapse
|
22
|
Abstract
This review covers the isolation, structural determination, synthesis and chemical and microbiological transformations of natural sesquiterpenoids. 423 references are cited.
Collapse
Affiliation(s)
- Braulio M Fraga
- Instituto de Productos Naturales y Agrobiología, CSIC, 38206, La Laguna, Tenerife, Canary Islands, Spain.
| |
Collapse
|
23
|
Abstract
Zr-mediated equilibrating cyclocarbonylation of a designed triene led with high diastereocontrol to the ABC 6-6-5 tricyclic core of ritterazine N. The 5-5 EF spiroketal side chain of ritterazine N was prepared by equilibrating cyclization of an acyclic keto diol. The two components were coupled, and the D ring was assembled by intramolecular aldol condensation.
Collapse
|
24
|
White DE, Stewart IC, Grubbs RH, Stoltz BM. The catalytic asymmetric total synthesis of elatol. J Am Chem Soc 2007; 130:810-1. [PMID: 18163634 DOI: 10.1021/ja710294k] [Citation(s) in RCA: 146] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Described in this report is the first total synthesis of elatol, a halogenated sesquiterpene in the chamigrene natural product family. The key disconnections in our synthetic approach include an enantioselective decarboxylative allylation to form the all-carbon quaternary stereocenter and a ring-closing olefin metathesis to concomitantly form the spirocyclic core as well as the fully substituted chlorinated olefin. This strategy represents a general platform for accessing the chamigrene natural product family, as demonstrated by the synthesis of (+)-laurencenone B as an intermediate in our route.
Collapse
Affiliation(s)
- David E White
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA
| | | | | | | |
Collapse
|