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Sahana MH, Paul D, Sharma H, Goswami RK. Total Synthesis of Antibacterial Macrolide Sorangiolide A. Org Lett 2023; 25:7827-7831. [PMID: 37856450 DOI: 10.1021/acs.orglett.3c03066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2023]
Abstract
A convergent route for the asymmetric total synthesis of antibacterial macrolide sorangiolide A has been developed for the first time. The key feature of this synthesis includes Krische iridium-catalyzed anti-diastereoselective carbonyl crotylation, Crimmins acetate aldol, Yamaguchi esterification, Julia-Kocienski olefination, Horner-Wadsworth-Emmons olefination, and ring-closing metathesis. The origin of the low intensity of the 13C{1H} NMR signals of the C1 and C2 centers of the natural product has been investigated, disclosing possible forms of existence for the natural product in the solution phase.
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Affiliation(s)
- Moinul Haque Sahana
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, West Bengal 700032, India
| | - Debobrata Paul
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, West Bengal 700032, India
| | - Himangshu Sharma
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, West Bengal 700032, India
| | - Rajib Kumar Goswami
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, West Bengal 700032, India
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2
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Saha S, Auddy SS, Chatterjee A, Sen P, Goswami RK. Late-Stage Functionalization: Total Synthesis of Beauveamide A and Its Congeners and Their Anticancer Activities. Org Lett 2022; 24:7113-7117. [PMID: 36148993 DOI: 10.1021/acs.orglett.2c02699] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Asymmetric total synthesis of cyclotetradepsipeptide beauveamide A has been achieved for the first time. A macrolactamization strategy involving two possible sites has been explored to find the most effective route for cyclization. A late-stage functionalization approach has been adopted for easy access of non-natural analogues of beauveamide A for further biological evaluation. Interestingly, the anticancer activity of one of the synthesized analogues was better than that of the parent natural product.
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Sahana MH, Saha D, Goswami RK. Total Synthesis of Strasseriolide A. J Org Chem 2022; 87:11805-11815. [PMID: 35960823 DOI: 10.1021/acs.joc.2c01595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Stereoselective total synthesis of structurally intriguing antimalarial macrolide strasseriolide A has been accomplished by adopting a convergent approach. The salient features of this synthesis include Co(BH4)2-mediated selective reduction of conjugated olefin, Crimmins propionate aldol, Evans alkylation, intermolecular Horner-Wadsworth-Emmons olefination, Yamaguchi macrolactonization, and selective saponification of ester moiety in the presence of a lactone functionality. The 13C{1H} NMR data of strasseriolide A were found to be very sensitive to its solution concentration.
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Affiliation(s)
- Moinul Haque Sahana
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Dhiman Saha
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Rajib Kumar Goswami
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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Auddy SS, Saha S, Goswami RK. Total synthesis and stereochemical assignment of bipolamide A acetate. Org Biomol Chem 2022; 20:3348-3358. [PMID: 35352738 DOI: 10.1039/d2ob00230b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Asymmetric total synthesis of an acetate analogue of the endophytic unstable secondary metabolite bipolamide A has been achieved for the first time adopting a convergent approach. The key feature of this synthesis includes Evans's asymmetric ethylation, Wittig olefination, Takai olefination, stereoselective Grignard addition and intermolecular Heck coupling. This eventually developed a synthetic route of the rarely found branched amine bearing an acyloin moiety. Our synthesis finally established unambiguously the stereochemistry of the unassigned C-8 center of the naturally occurring unstable bipolamide A.
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Affiliation(s)
- Sourya Shankar Auddy
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
| | - Sanu Saha
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
| | - Rajib Kumar Goswami
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
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Abstract
A convergent route for the asymmetric total synthesis of potent anticancer polyketide natural product amphirionin-2 has been developed. Our initial synthetic trials revealed that the proposed structures of amphirionin-2 need to be revised consistent with a recent report of Fuwa et al., where the actual structure of amphirionin-2 was established. The key features of our synthesis comprised Sharpless asymmetric dihydroxylation, followed by cycloetherification, Wittig olefination, Julia-Kocienski olefination, and Crimmins propionate aldol reaction.
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Affiliation(s)
- Dhiman Saha
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Gour Hari Mandal
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Rajib Kumar Goswami
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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Beemelmanns C, Roman D, Sauer M. Applications of the Horner–Wadsworth–Emmons Olefination in Modern Natural Product Synthesis. SYNTHESIS-STUTTGART 2021. [DOI: 10.1055/a-1493-6331] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
AbstractThe Horner–Wadsworth–Emmons (HWE) reaction is one of the most reliable olefination reaction and can be broadly applied in organic chemistry and natural product synthesis with excellent selectivity. Within the last few years HWE reaction conditions have been optimized and new reagents developed to overcome challenges in the total syntheses of natural products. This review highlights the application of HWE olefinations in total syntheses of structurally different natural products covering 2015 to 2020. Applied HWE reagents and reactions conditions are highlighted to support future synthetic approaches and serve as guideline to find the best HWE conditions for the most complicated natural products.1 Introduction and Historical Background2 Applications of HWE2.1 Cyclization by HWE Reactions2.2.1 Formation of Medium- to Larger-Sized Rings2.2.2 Formation of Small- to Medium-Sized Rings2.3 Synthesis of α,β-Unsaturated Carbonyl Groups2.4 Synthesis of Substituted C=C Bonds2.5 Late-Stage Modifications by HWE Reactions2.6 HWE Reactions on Solid Supports2.7 Synthesis of Poly-Conjugated C=C Bonds2.8 HWE-Mediated Coupling of Larger Building Blocks2.9 Miscellaneous3 Summary and Outlook
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Abstract
This review covers the literature published between January and December in 2018 for marine natural products (MNPs), with 717 citations (706 for the period January to December 2018) referring to compounds isolated from marine microorganisms and phytoplankton, green, brown and red algae, sponges, cnidarians, bryozoans, molluscs, tunicates, echinoderms, mangroves and other intertidal plants and microorganisms. The emphasis is on new compounds (1554 in 469 papers for 2018), together with the relevant biological activities, source organisms and country of origin. Reviews, biosynthetic studies, first syntheses, and syntheses that led to the revision of structures or stereochemistries, have been included. The proportion of MNPs assigned absolute configuration over the last decade is also surveyed.
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Affiliation(s)
- Anthony R Carroll
- School of Environment and Science, Griffith University, Gold Coast, Australia. and Griffith Institute for Drug Discovery, Griffith University, Brisbane, Australia
| | - Brent R Copp
- School of Chemical Sciences, University of Auckland, Auckland, New Zealand
| | - Rohan A Davis
- Griffith Institute for Drug Discovery, Griffith University, Brisbane, Australia and School of Environment and Science, Griffith University, Brisbane, Australia
| | - Robert A Keyzers
- Centre for Biodiscovery, School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand
| | - Michèle R Prinsep
- Chemistry, School of Science, University of Waikato, Hamilton, New Zealand
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Paul D, Kundu A, Saha S, Goswami RK. Total synthesis: the structural confirmation of natural products. Chem Commun (Camb) 2021; 57:3307-3322. [DOI: 10.1039/d1cc00241d] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
This feature article highlights total synthesis as one of the reliable tools for the structural confirmation of natural products.
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Affiliation(s)
- Debobrata Paul
- School of Chemical Sciences
- Indian Association for the Cultivation of Science
- Kolkata 700032
- India
| | - Ashis Kundu
- School of Chemical Sciences
- Indian Association for the Cultivation of Science
- Kolkata 700032
- India
| | - Sanu Saha
- School of Chemical Sciences
- Indian Association for the Cultivation of Science
- Kolkata 700032
- India
| | - Rajib Kumar Goswami
- School of Chemical Sciences
- Indian Association for the Cultivation of Science
- Kolkata 700032
- India
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Hubert P, Seibel E, Beemelmanns C, Campagne J, Figueiredo RM. Stereoselective Construction of (
E,Z
)‐1,3‐Dienes and Its Application in Natural Product Synthesis. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000730] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Pierre Hubert
- ICGM Univ Montpellier, CNRS, ENSCM Montpellier France
| | - Elena Seibel
- Hans-Knöll-Institute (HKI) Beutenbergstrasse 11a 07745 Jena Germany
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Abstract
Total synthesis of marine secondary metabolite nafuredin B has been achieved for the first time using a convergent strategy. Sharpless epoxidation followed by acid catalyzed epoxide opening were adopted to install the tetrasubstituted hydroxy center, whereas the iterative Julia-Kocienski olefination, Wittig olefination and HWE olefination afforded the olefin bonds. Ring closing metathesis in the presence of a free tetrasubstituted hydroxy group provided the unsaturated δ-lactone moiety. This synthetic study provided unambiguous structural confirmation of the isolated nafuredin B.
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Affiliation(s)
- Gour Hari Mandal
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
| | - Dhiman Saha
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
| | - Rajib Kumar Goswami
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
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Mondal J, Sarkar R, Sen P, Goswami RK. Total Synthesis and Stereochemical Assignment of Sunshinamide and Its Anticancer Activity. Org Lett 2020; 22:1188-1192. [DOI: 10.1021/acs.orglett.0c00070] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Saha D, Guchhait S, Goswami RK. Total Synthesis and Stereochemical Assignment of Penicitide A. Org Lett 2020; 22:745-749. [DOI: 10.1021/acs.orglett.9b04585] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dhiman Saha
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Sandip Guchhait
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Rajib Kumar Goswami
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
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Paul D, Sahana MH, Mandal P, Chakrabarti P, Goswami RK. Biselyngbyolides A & C: their total synthesis and anticancer activities. Org Biomol Chem 2020; 18:7151-7164. [DOI: 10.1039/d0ob00576b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Convergent strategies have been developed for the total synthesis of biselyngbyolides A & C, and their anticancer activities were described.
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Affiliation(s)
- Debobrata Paul
- School of Chemical Sciences
- Indian Association for the Cultivation of Science
- Jadavpur
- India
| | - Moinul Haque Sahana
- School of Chemical Sciences
- Indian Association for the Cultivation of Science
- Jadavpur
- India
| | - Pratiti Mandal
- Division of Cell Biology & Physiology
- CSIR-Indian Institute of Chemical Biology
- Jadavpur
- India
| | - Partha Chakrabarti
- Division of Cell Biology & Physiology
- CSIR-Indian Institute of Chemical Biology
- Jadavpur
- India
| | - Rajib Kumar Goswami
- School of Chemical Sciences
- Indian Association for the Cultivation of Science
- Jadavpur
- India
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Everson J, Kiefel MJ. Synthesis of Butenolides via a Horner-Wadsworth-Emmons Cascading Dimerization Reaction. J Org Chem 2019; 84:15226-15235. [PMID: 31657574 DOI: 10.1021/acs.joc.9b02015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The efficient synthesis of a range of structurally related butenolides has been observed while we were exploring the substrate-scope of a Horner-Wadsworth-Emmons (HWE) reaction. While aliphatic aldehydes gave the expected HWE product, aromatic aldehydes furnished butenolides, resulting from the dimerization of the HWE product during desilylation of the initially formed HWE adduct. In addition to isolating butenolides in a high yield, we have also determined precisely when dimerization occurs.
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Affiliation(s)
- Jack Everson
- Institute for Glycomics , Griffith University Gold Coast Campus , Southport , Queensland 4222 , Australia
| | - Milton J Kiefel
- Institute for Glycomics , Griffith University Gold Coast Campus , Southport , Queensland 4222 , Australia
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