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Anders L, Lindel T. Azido and desamino analogs of the marine natural product oroidin. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2023. [DOI: 10.1515/znb-2023-0305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/11/2023]
Abstract
Abstract
As part of our program on the synthesis and reactivity of the pyrrole-imidazole alkaloids from marine sponges, the synthesis of the 2-azido analog of the key marine natural product oroidin is reported. In addition, desaminooroidin and its alkyne analog were synthesized. Red-Al reduction of a 4-alkynylimidazole intermediate afforded the (E)-alkene, without having to pass via the (Z)-alkene. Coupling of 4,5-dibromopyrrole-2-carboxylic acid with 2-azidoimidazolylprop-2-en-1-amine was best achieved by EDCI-mediated coupling, which was superior to using the corresponding trichloromethylketone. Use of t-BuOK in acetonitrile can be recommended for the coupling of non-azidated alkenyl and alkynylimidazoles. The azido analog of oroidin underwent click cycloadditions to imidazolyltriazoles.
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Affiliation(s)
- Lisa Anders
- TU Braunschweig, Institute of Organic Chemistry , Hagenring 30, 38106 Braunschweig , Germany
| | - Thomas Lindel
- TU Braunschweig, Institute of Organic Chemistry , Hagenring 30, 38106 Braunschweig , Germany
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Bhandari MR, Herath AK, Rasapalli S, Yousufuddin M, Lovely CJ. Total Synthesis of the Nagelamides - Synthetic Studies toward the Reported Structure of Nagelamide D and Nagelamide E Framework. J Org Chem 2020; 85:12971-12987. [PMID: 32880173 DOI: 10.1021/acs.joc.0c01617] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The nagelamides are a small subset of the oroidin family of marine sponge-derived alkaloids and are, for the most part, dimeric in nature. As part of our efforts to develop synthetic access to this family, a Stille cross-coupling strategy is used to construct the bis-imidazolyl core skeleton. Reduction of the bis-vinylimidazole delivered the core framework of nagelamide D. Introduction of the 2-amino groups via the corresponding azides and introduction of the pyrrolecarboxamides through a double Mitsunobu reaction using a pyrrole hydantoin provided the putative structure of nagelamide D. The spectroscopic data for the synthetic and sponge-derived materials did not match well, whereas the spectroscopic data were a good match for closely related oroidin alkaloids, supporting the structure of the synthetic material. The structure of the synthetic material was further corroborated by obtaining an X-ray crystal structure of a derivative. Electrocyclization of an advanced precursor affords a dihydrobenzimidazole, which is expected to serve as a key intermediate en route to nagelamide E and ageliferin.
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Affiliation(s)
- Manojkumar R Bhandari
- Department of Chemistry and Biochemistry, The University of Texas of Arlington, Arlington, Texas 76019-0065, United States
| | - Apsara K Herath
- Department of Chemistry and Biochemistry, The University of Texas of Arlington, Arlington, Texas 76019-0065, United States
| | - Sivappa Rasapalli
- Department of Chemistry and Biochemistry, University of Massachusetts Dartmouth, 285 Old Westport Rd, North Dartmouth, Massachusetts 02747, United States
| | - Muhammed Yousufuddin
- Life and Health Sciences Department, University of North Texas at Dallas, Dallas, Texas 75241, United States
| | - Carl J Lovely
- Department of Chemistry and Biochemistry, The University of Texas of Arlington, Arlington, Texas 76019-0065, United States
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Lipson VV, Pavlovska TL, Svetlichnaya NV, Poryvai AA, Gorobets NY, Van der Eycken EV, Konovalova IS, Shiskina SV, Borisov AV, Musatov VI, Mazepa AV. Novel (2-amino-4-arylimidazolyl)propanoic acids and pyrrolo[1,2- c]imidazoles via the domino reactions of 2-amino-4-arylimidazoles with carbonyl and methylene active compounds. Beilstein J Org Chem 2019; 15:1032-1045. [PMID: 31164941 PMCID: PMC6541323 DOI: 10.3762/bjoc.15.101] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2019] [Accepted: 04/18/2019] [Indexed: 01/28/2023] Open
Abstract
The unexpectedly uncatalyzed reaction between 2-amino-4-arylimidazoles, aromatic aldehydes and Meldrum’s acid has selectively led to the corresponding Knoevenagel–Michael adducts containing a free amino group in the imidazole fragment. The adducts derived from Meldrum’s acid have been smoothly converted into 1,7-diaryl-3-amino-6,7-dihydro-5H-pyrrolo[1,2-c]imidazol-5-ones and 3-(2-amino-4-aryl-1H-imidazol-5-yl)-3-arylpropanoic acids. The interaction of 2-amino-4-arylimidazoles with aromatic aldehydes or isatins and acyclic methylene active compounds has led to the formation of pyrrolo[1,2-c]imidazole-6-carbonitriles, pyrrolo[1,2-с]imidazole-6-carboxylates and spiro[indoline-3,7'-pyrrolo[1,2-c]imidazoles], which can be considered as the analogues of both 3,3’-spirooxindole and 2-aminoimidazole marine sponge alkaloids.
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Affiliation(s)
- Victoria V Lipson
- SSI "Institute for Single Crystals" of National Academy of Sciences of Ukraine, Nauky Ave. 60, Kharkiv 61074, Ukraine.,Antidiabetic Drug Laboratory, SI "V.Ya. Danilevsky Institute for Endocrine Pathology Problems", Academy of Medical Sciences of Ukraine, 10, Alchevskih St., Kharkiv 61002, Ukraine.,Chemistry Department, V.N. Karazin Kharkov National University, Kharkov 61022, Ukraine
| | - Tetiana L Pavlovska
- SSI "Institute for Single Crystals" of National Academy of Sciences of Ukraine, Nauky Ave. 60, Kharkiv 61074, Ukraine.,Chemistry Department, V.N. Karazin Kharkov National University, Kharkov 61022, Ukraine
| | - Nataliya V Svetlichnaya
- Antidiabetic Drug Laboratory, SI "V.Ya. Danilevsky Institute for Endocrine Pathology Problems", Academy of Medical Sciences of Ukraine, 10, Alchevskih St., Kharkiv 61002, Ukraine
| | - Anna A Poryvai
- Chemistry Department, V.N. Karazin Kharkov National University, Kharkov 61022, Ukraine
| | - Nikolay Yu Gorobets
- SSI "Institute for Single Crystals" of National Academy of Sciences of Ukraine, Nauky Ave. 60, Kharkiv 61074, Ukraine
| | - Erik V Van der Eycken
- Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC), Katholieke Universiteit Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium.,Peoples' Friendship University of Russia (RUDN University) 6 Miklukho-Maklaya street, Moscow, 117198, Russia
| | - Irina S Konovalova
- SSI "Institute for Single Crystals" of National Academy of Sciences of Ukraine, Nauky Ave. 60, Kharkiv 61074, Ukraine
| | - Svetlana V Shiskina
- SSI "Institute for Single Crystals" of National Academy of Sciences of Ukraine, Nauky Ave. 60, Kharkiv 61074, Ukraine.,Chemistry Department, V.N. Karazin Kharkov National University, Kharkov 61022, Ukraine
| | | | - Vladimir I Musatov
- SSI "Institute for Single Crystals" of National Academy of Sciences of Ukraine, Nauky Ave. 60, Kharkiv 61074, Ukraine
| | - Alexander V Mazepa
- A.V. Bogatsky physico-chemical institute of the National Academy of Sciences of Ukraine, 86, Lustdorfskaya doroga, 65080, Odessa, Ukraine
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Abstract
Covering: July 2012 to June 2015. Previous review: Nat. Prod. Rep., 2013, 30, 869-915The structurally diverse imidazole-, oxazole-, and thiazole-containing secondary metabolites are widely distributed in terrestrial and marine environments, and exhibit extensive pharmacological activities. In this review the latest progress involving the isolation, biological activities, and chemical and biogenetic synthesis studies on these natural products has been summarized.
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Affiliation(s)
- Zhong Jin
- State Key Laboratory and Institute of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China. and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, China
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