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G.-Simonian N, Spieß P, Riomet M, Maryasin B, Klose I, Beaton Garcia A, Pollesböck L, Kaldre D, Todorovic U, Minghua Liu J, Kaiser D, González L, Maulide N. Stereodivergent Synthesis of 1,4-Dicarbonyl Compounds through Sulfonium Rearrangement: Mechanistic Investigation, Stereocontrolled Access to γ-Lactones and γ-Lactams, and Total Synthesis of Paraconic Acids. J Am Chem Soc 2024; 146:13914-13923. [PMID: 38741029 PMCID: PMC11117187 DOI: 10.1021/jacs.4c01755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2024] [Revised: 04/25/2024] [Accepted: 04/26/2024] [Indexed: 05/16/2024]
Abstract
Although simple γ-lactones and γ-lactams have received considerable attention from the synthetic community, particularly due to their relevance in biological and medicinal contexts, stereoselective synthetic approaches to more densely substituted derivatives remain scarce. The in-depth study presented herein, showcasing a straightforward method for the stereocontrolled synthesis of γ-lactones and γ-lactams, builds on and considerably expands the stereodivergent synthesis of 1,4-dicarbonyl compounds by a ynamide/vinyl sulfoxide coupling. A full mechanistic and computational study of the rearrangement was conducted, uncovering the role of all of the reaction components and providing a rationale for stereoselection. The broad applicability of the developed tools to streamlining synthesis is demonstrated by concise enantioselective total syntheses of (+)-nephrosteranic acid, (+)-rocellaric acid, and (+)-nephromopsinic acid.
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Affiliation(s)
- Nicolas G.-Simonian
- Institute
of Organic Chemistry, University of Vienna, Währinger Straße 38, 1090 Vienna, Austria
| | - Philipp Spieß
- Institute
of Organic Chemistry, University of Vienna, Währinger Straße 38, 1090 Vienna, Austria
| | - Margaux Riomet
- Institute
of Organic Chemistry, University of Vienna, Währinger Straße 38, 1090 Vienna, Austria
| | - Boris Maryasin
- Institute
of Organic Chemistry, University of Vienna, Währinger Straße 38, 1090 Vienna, Austria
- Institute
of Theoretical Chemistry, University of
Vienna, Währinger
Straße 17, 1090 Vienna, Austria
| | - Immo Klose
- Institute
of Organic Chemistry, University of Vienna, Währinger Straße 38, 1090 Vienna, Austria
| | - Alexander Beaton Garcia
- Institute
of Organic Chemistry, University of Vienna, Währinger Straße 38, 1090 Vienna, Austria
| | - Laurin Pollesböck
- Institute
of Organic Chemistry, University of Vienna, Währinger Straße 38, 1090 Vienna, Austria
| | - Dainis Kaldre
- Institute
of Organic Chemistry, University of Vienna, Währinger Straße 38, 1090 Vienna, Austria
| | - Uroš Todorovic
- Institute
of Organic Chemistry, University of Vienna, Währinger Straße 38, 1090 Vienna, Austria
| | - Julia Minghua Liu
- Institute
of Theoretical Chemistry, University of
Vienna, Währinger
Straße 17, 1090 Vienna, Austria
| | - Daniel Kaiser
- Institute
of Organic Chemistry, University of Vienna, Währinger Straße 38, 1090 Vienna, Austria
| | - Leticia González
- Institute
of Theoretical Chemistry, University of
Vienna, Währinger
Straße 17, 1090 Vienna, Austria
| | - Nuno Maulide
- Institute
of Organic Chemistry, University of Vienna, Währinger Straße 38, 1090 Vienna, Austria
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González EV, Schwaiger S, Stuppner H. Two-step isolation of the two major paraconic acids of Cetraria islandica. J Sep Sci 2023; 46:e2200805. [PMID: 36630529 DOI: 10.1002/jssc.202200805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 11/17/2022] [Accepted: 12/23/2022] [Indexed: 01/13/2023]
Abstract
The lichen Cetraria islandica is traditionally used as a demulcent for the symptomatic treatment of irritations of the mouth and throat and associated dry cough, as well as for the treatment of temporary loss of appetite. In addition to depsides and depsidones, thalli contain paraconic acids, a group of secondary metabolites commonly found in lichens and fungi. Among those, protolichesterinic acid has shown promising pharmacological activities. However, the efficient isolation of paraconic acids is quite complex due to their very similar chemical structures and their weak ultraviolet absorption. In the present work, a two-step isolation protocol of protolichesterinic acid and lichesterinic acid from a complex paraconic acid mixture is described using Sephadex LH20 column chromatography and fast centrifugal partition chromatography. Final purities higher than 95% and recoveries above 50% are achieved. Additionally, reliable qualitative techniques for detecting and differentiating paraconic acids are described. Finally, some data on compound stability and enantiomeric purity are shown.
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Affiliation(s)
| | - Stefan Schwaiger
- Institute of Pharmacy/Pharmacognosy, CMBI, University of Innsbruck, Innsbruck, Austria
| | - Hermann Stuppner
- Institute of Pharmacy/Pharmacognosy, CMBI, University of Innsbruck, Innsbruck, Austria
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3
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Thangamalar S, Thangamani M, Srinivasan K. The Cloke-Wilson rearrangement of aroyl-substituted donor-acceptor cylopropanes containing arylethyl donors. Org Biomol Chem 2022; 20:3145-3153. [PMID: 35343561 DOI: 10.1039/d2ob00292b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The chemistry of donor-acceptor (D-A) cyclopropanes containing alkyl donors has been scantily investigated. In the present work, we have synthesized new D-A cyclopropanes containing arylethyl donors and explored their reactivity in the presence of Lewis acids. Upon treatment with SnCl4, these cyclopropanes underwent the Cloke-Wilson rearrangement to yield 3,4,5-trisubstituted γ-butyrolactones in good yields with high diastereoselectivity.
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Affiliation(s)
| | - Murugesan Thangamani
- School of Chemistry, Bharathidasan University, Tiruchirappalli-620024, Tamil Nadu, India.
| | - Kannupal Srinivasan
- School of Chemistry, Bharathidasan University, Tiruchirappalli-620024, Tamil Nadu, India.
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Kaur A, Gehlawat A, Prakash R, Pandey SK. Enantioselective Total Synthesis of Sacubitril. ChemistrySelect 2021. [DOI: 10.1002/slct.202102506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Amanpreet Kaur
- School of Chemistry and Biochemistry Thapar Institute of Engineering and Technology Patiala 147 001 India
| | - Anju Gehlawat
- School of Chemistry and Biochemistry Thapar Institute of Engineering and Technology Patiala 147 001 India
| | - Ranjana Prakash
- School of Chemistry and Biochemistry Thapar Institute of Engineering and Technology Patiala 147 001 India
| | - Satyendra Kumar Pandey
- School of Chemistry and Biochemistry Thapar Institute of Engineering and Technology Patiala 147 001 India
- Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221 005 India
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