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Tavakoli A, Dudley GB. Regioselective [2 + 2 + 2] Alkyne Cyclotrimerizations to Hexasubstituted Benzenes: Syntheses of Fomajorin D and Fomajorin S. J Org Chem 2024; 89:6847-6852. [PMID: 38683747 PMCID: PMC11110065 DOI: 10.1021/acs.joc.4c00224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 04/09/2024] [Accepted: 04/17/2024] [Indexed: 05/02/2024]
Abstract
Hexasubstituted benzenoids are prepared by regioselective bimolecular [2 + 2 + 2] alkyne cyclotrimerizations of diynes with alkynes. These convergent and efficient benzannulations are directed toward and lead to the first total syntheses of the illudalane sequiterpenes fomajorin D and S, in 10 and 7 steps, respectively, from commercially available dimedone. Control experiments suggest that hydrogen bonding may play a role in preorganizing the diyne and alkyne coupling partners for establishing the desired regioselectivity, but other factors are likely involved in the selective formation of other regioisomers.
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Affiliation(s)
- Amir Tavakoli
- C. Eugene Bennett Department
of Chemistry, West Virginia University, Morgantown, West Virginia 26505, United States
| | - Gregory B. Dudley
- C. Eugene Bennett Department
of Chemistry, West Virginia University, Morgantown, West Virginia 26505, United States
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Zhang S, Zhu HT, Xi JJ, Wang SB, Chang X, Shen CP, Feng Y, Zhang ZY, Zhao MT, Zhang LK, Li M, Jin X, Zhou AX, Zhou NN. Brønsted Acid-Catalyzed Intramolecular Tandem Double Cyclization of γ-Hydroxy Acetylenic Ketones with Alkynes into Naphtho[1,2- b]furan-3-ones. J Org Chem 2024; 89:1633-1647. [PMID: 38235569 DOI: 10.1021/acs.joc.3c02300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2024]
Abstract
A metal-free and atom-economic route for the synthesis of naphtho[1,2-b]furan-3-ones has been realized via p-TsOH·H2O-catalyzed intramolecular tandem double cyclization of γ-hydroxy acetylenic ketones with alkynes in formic acid. The benzene-linked furanonyl-ynes are the key intermediates obtained by the scission/recombination of C-O double bonds. Further, the structural modifications of the representative product were implemented by reduction, demethylation, substitution, and [5 + 2]-cycloaddition.
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Affiliation(s)
- Sen Zhang
- College of Chemistry and Chemical Engineering, Shannxi Key Laboratory of Phytochemistry, Baoji University of Arts and Sciences, Baoji 721013, China
| | - Hai-Tao Zhu
- College of Chemistry and Chemical Engineering, Shannxi Key Laboratory of Phytochemistry, Baoji University of Arts and Sciences, Baoji 721013, China
| | - Jia-Jun Xi
- College of Chemistry and Chemical Engineering, Shannxi Key Laboratory of Phytochemistry, Baoji University of Arts and Sciences, Baoji 721013, China
| | - San-Bao Wang
- College of Chemistry and Chemical Engineering, Shannxi Key Laboratory of Phytochemistry, Baoji University of Arts and Sciences, Baoji 721013, China
| | - Xin Chang
- College of Chemistry and Chemical Engineering, Shannxi Key Laboratory of Phytochemistry, Baoji University of Arts and Sciences, Baoji 721013, China
| | - Cheng-Ping Shen
- College of Chemistry and Chemical Engineering, Shannxi Key Laboratory of Phytochemistry, Baoji University of Arts and Sciences, Baoji 721013, China
| | - Yue Feng
- College of Chemistry and Chemical Engineering, Shannxi Key Laboratory of Phytochemistry, Baoji University of Arts and Sciences, Baoji 721013, China
| | - Zhao-Yang Zhang
- College of Chemistry and Chemical Engineering, Shannxi Key Laboratory of Phytochemistry, Baoji University of Arts and Sciences, Baoji 721013, China
| | - Meng-Ting Zhao
- College of Chemistry and Chemical Engineering, Shannxi Key Laboratory of Phytochemistry, Baoji University of Arts and Sciences, Baoji 721013, China
| | - Li-Kun Zhang
- College of Chemistry and Chemical Engineering, Shannxi Key Laboratory of Phytochemistry, Baoji University of Arts and Sciences, Baoji 721013, China
| | - Mi Li
- Gansu University Key Laboratory for Molecular Medicine & Chinese Medicine Prevention and Treatment of Major Diseases, Gansu University of Chinese Medicine, Lanzhou 730000, China
| | - Xiaojie Jin
- Gansu University Key Laboratory for Molecular Medicine & Chinese Medicine Prevention and Treatment of Major Diseases, Gansu University of Chinese Medicine, Lanzhou 730000, China
| | - An-Xi Zhou
- key Laboratory of Applied Organic Chemistry, Higher Institutions of Jiangxi Province, Shangrao Normal University, Shangrao 334000, China
| | - Ni-Ni Zhou
- College of Chemistry and Chemical Engineering, Shannxi Key Laboratory of Phytochemistry, Baoji University of Arts and Sciences, Baoji 721013, China
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4,4′-(Butane-1,4-diyl)bis(4-methyl-1,2-dioxolane-3,5-dione). MOLBANK 2022. [DOI: 10.3390/m1497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Over the past decades, studies of cyclic diacyl peroxides have shown superior or even fundamentally new reactivity compared to their acyclic counterparts in various reactions. Previously, the scope of cyclic diacyl peroxides was limited to the mono peroxy compounds. The first doubled cyclic diacyl peroxide is presented herein. The diperoxide was characterized by NMR spectroscopy, mass spectrometry, and IR spectroscopy. The structure of 4,4′-(butane-1,4-diyl)bis(4-methyl-1,2-dioxolane-3,5-dione) was confirmed by X-ray diffraction analysis. The novel diperoxide was prepared in a 55% overall yield in three steps from dibromobutane and diethyl methylmalonate.
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