1
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Scaringi S, Leforestier B, Mazet C. Remote Functionalization by Pd-Catalyzed Isomerization of Alkynyl Alcohols. J Am Chem Soc 2024; 146:18606-18615. [PMID: 38941513 PMCID: PMC11240579 DOI: 10.1021/jacs.4c05136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2024] [Revised: 05/31/2024] [Accepted: 06/05/2024] [Indexed: 06/30/2024]
Abstract
In recent years, progress has been made in the development of catalytic methods that allow remote functionalizations based on alkene isomerization. In contrast, protocols based on alkyne isomerization are comparatively rare. Herein, we report a general Pd-catalyzed long-range isomerization of alkynyl alcohols. Starting from aryl-, heteroaryl-, or alkyl-substituted precursors, the optimized system provides access preferentially to the thermodynamically more stable α,β-unsaturated aldehydes and is compatible with potentially sensitive functional groups. We showed that the migration of both π-components of the carbon-carbon triple bond can be sustained over several methylene units. Computational investigations served to shed light on the key elementary steps responsible for the reactivity and selectivity. These include an unorthodox phosphine-assisted deprotonation rather than a more conventional β-hydride elimination in the final tautomerization event.
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Affiliation(s)
| | | | - Clément Mazet
- Department of Organic Chemistry, University of Geneva, 30 Quai Ernest Ansermet, 1211 Geneva, Switzerland
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2
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Fernandes RA, Choudhary P, Khatun GN. Chiral Pool Meets Chiral Catalysis: Eight-Step Convergent Total Synthesis of Anticancer Natural Lipid Mycalol. J Org Chem 2023; 88:17389-17397. [PMID: 38008913 DOI: 10.1021/acs.joc.3c02201] [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: 11/28/2023]
Abstract
An exemplary blend of chiral pool with chiral catalysis is exhibited in an eight-step (longest) convergent asymmetric total synthesis of mycalol, which is a promising anticancer natural lipid from a marine source. The polyhydroxy lipid is constructed by using four blocks, and two of which are derived from the chiral pool (d-mannitol and d-gluconolactone) and the other two by chiral catalysis (Sharpless epoxidation and Keck allylation). Alkylation and metathesis were used to knit the blocks in an excellent display of a modular convergent eight-step synthesis. The modular excess will enable rapid analogue generation as revealed by the convenient synthesis of 4-epi-mycalol similarly in an eight-step sequence.
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Affiliation(s)
- Rodney A Fernandes
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra 400076, India
| | - Priyanka Choudhary
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra 400076, India
| | - Gulenur N Khatun
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra 400076, India
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3
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The Alkyne Zipper Reaction: A Useful Tool in Synthetic Chemistry. REACTIONS 2022. [DOI: 10.3390/reactions4010002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The alkyne zipper reaction is an internal-to-terminal alkyne isomerization reaction with many interesting applications in synthetic chemistry, as it constitutes an efficient means of achieving acetylene functionalization. A review of its applications in synthesis processes is presented in this paper, with a brief overview of the mechanistic features of the alkyne zipper reaction, as well as a brief overview of its future potential.
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4
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Subba S, Saha S, Mandal S, Jyoti Ghosh A, Saha T. First total synthesis of aspergillolide. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.154081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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5
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Shen SM, Appendino G, Guo YW. Pitfalls in the structural elucidation of small molecules. A critical analysis of a decade of structural misassignments of marine natural products. Nat Prod Rep 2022; 39:1803-1832. [PMID: 35770685 DOI: 10.1039/d2np00023g] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Covering: July 2010 to August 2021This article summarizes more than 200 cases of misassigned marine natural products reported between July 2010 and August 2021, sorting out errors according to the structural elements. Based on a comparative analysis of the original and the revised structures, major pitfalls still plaguing the structural elucidation of small molecules were identified, emphasizing the role of total synthesis, crystallography, as well as chemical- and biosynthetic logic to complement spectroscopic data. Distinct "trends" in natural product misassignment are evident between compounds of marine and plant origin, with an overall much lower incidence of "impossible" structures within misassigned marine natural products.
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Affiliation(s)
- Shou-Mao Shen
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China. .,School of Chinese Materia Medica, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Giovanni Appendino
- Dipartimento di Scienze del Farmaco, Universitá degli Studi del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Yue-Wei Guo
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China. .,Drug Discovery Shandong Laboratory, Bohai Rim Advanced Research Institute for Drug Discovery, Yantai, Shandong 264117, China
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6
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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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7
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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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8
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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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9
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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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10
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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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11
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Nobre PC, Vargas HA, Jacoby CG, Schneider PH, Casaril AM, Savegnago L, Schumacher RF, Lenardão EJ, Ávila DS, Rodrigues Junior LB, Perin G. Synthesis of enantiomerically pure glycerol derivatives containing an organochalcogen unit: In vitro and in vivo antioxidant activity. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2017.08.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
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12
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Guchhait S, Goswami RK. Studies toward the synthesis of macrotermycin C: stereoselective construction of the acyclic skeleton of the aglycon. Org Biomol Chem 2019; 17:9502-9509. [DOI: 10.1039/c9ob01999e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first asymmetric synthesis of the acyclic skeleton of the aglycon of macrotermycin C has been achieved in 17 linear steps with 5.7% overall yield following a convergent approach.
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Affiliation(s)
- Sandip Guchhait
- 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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13
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Chatterjee S, Mandal GH, Goswami RK. Total Synthesis of Cytospolide Q. ACS OMEGA 2018; 3:7350-7357. [PMID: 31458894 PMCID: PMC6644782 DOI: 10.1021/acsomega.8b00937] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 06/21/2018] [Indexed: 06/10/2023]
Abstract
A flexible and convergent strategy for the stereoselective total synthesis of bioactive marine natural product cytospolide Q has been developed. The key features of this synthesis include Evans anti-aldol reaction for the installation of C-2 and C-3 stereocenters and cycloetherification via epoxide opening followed by concomitant lactonization for the construction of tetrahydrofuran and γ-butyrolactone scaffolds. This synthetic study also revealed that protected oxygenated functionality (methyl ester or benzyl ether) at C-1 position participated readily in epoxide opening.
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14
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Paul D, Saha S, Goswami RK. Total Synthesis of Pestalotioprolide E and Structural Revision of Pestalotioprolide F. Org Lett 2018; 20:4606-4609. [DOI: 10.1021/acs.orglett.8b01894] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Debobrata Paul
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Sanu Saha
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Rajib Kumar Goswami
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
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15
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Chatterjee S, Kuilya TK, Goswami RK. Studies Directed toward the Stereoselective Synthesis of Cytospolide E. ACS OMEGA 2018; 3:1041-1059. [PMID: 31457947 PMCID: PMC6641448 DOI: 10.1021/acsomega.7b01893] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Accepted: 01/15/2018] [Indexed: 06/10/2023]
Abstract
Our exhaustive effort toward the total synthesis of cytotoxic marine nonanolide cytospolide E has been detailed. To achieve this synthesis, we have explored both the ring-closing metathesis and lactonization-based macrocyclization strategies using a variety of precursors. Unfortunately, none of them provided the desired product. The ring-closing metathesis approach provided mainly the macrocycle with Z-olefin, whereas the macrolactonization strategy culminated in 8-epi-9-epi-cytospolide E following the regioselective formation of a 10-membered macrocycle over a 9-membered macrocycle.
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Affiliation(s)
- Shamba Chatterjee
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Tapan Kumar Kuilya
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Rajib Kumar Goswami
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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16
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Nageswara Rao K, Kumar K, Ghosh S. Total Synthesis of the Anticancer Marine Natural Product Mycalol. European J Org Chem 2018. [DOI: 10.1002/ejoc.201701562] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- K. Nageswara Rao
- Organic and Biomolecular Chemistry Division; CSIR-Indian Institute of Chemical Technology; 500007 Hyderabad India
| | - Katragunta Kumar
- Division of Natural Products Chemistry; CSIR-Indian Institute of Chemical Technology; 500007 Hyderabad India
| | - Subhash Ghosh
- Organic and Biomolecular Chemistry Division; CSIR-Indian Institute of Chemical Technology; 500007 Hyderabad India
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17
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Kuilya TK, Das S, Saha D, Goswami RK. Studies toward the synthesis of strevertenes A and G: stereoselective construction of C1–C19segments of the molecules. Org Biomol Chem 2018; 16:7595-7608. [DOI: 10.1039/c8ob01754a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Efficient route for the stereoselective synthesis of common C1–C19segment of strevertenes A and G has been developed.
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Affiliation(s)
- Tapan Kumar Kuilya
- Department of Organic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata-700032
- India
| | - Subhendu Das
- Department of Organic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata-700032
- India
| | - Dhiman Saha
- Department of Organic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata-700032
- India
| | - Rajib Kumar Goswami
- Department of Organic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata-700032
- India
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18
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Xu F, Zhong YL, Li H, Qi J, Desmond R, Song ZJ, Park J, Wang T, Truppo M, Humphrey GR, Ruck RT. Asymmetric Synthesis of Functionalized trans-Cyclopropoxy Building Block for Grazoprevir. Org Lett 2017; 19:5880-5883. [DOI: 10.1021/acs.orglett.7b02867] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Feng Xu
- Department of Process Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Yong-Li Zhong
- Department of Process Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Hongming Li
- Department of Process Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Ji Qi
- Department of Process Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Richard Desmond
- Department of Process Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Zhiguo J. Song
- Department of Process Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Jeonghan Park
- Department of Process Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Tao Wang
- Department of Process Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Matthew Truppo
- Department of Process Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Guy R. Humphrey
- Department of Process Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Rebecca T. Ruck
- Department of Process Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
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19
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Paul D, Das S, Goswami RK. Total Synthesis of Pestalotioprolide G and Putative Structure of Pestalotioprolide H. J Org Chem 2017; 82:7437-7445. [DOI: 10.1021/acs.joc.7b01115] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Debobrata Paul
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Sayantan Das
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Rajib Kumar Goswami
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
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20
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Abstract
Covering: 2015. Previous review: Nat. Prod. Rep., 2016, 33, 382-431This review covers the literature published in 2015 for marine natural products (MNPs), with 1220 citations (792 for the period January to December 2015) 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 (1340 in 429 papers for 2015), together with the relevant biological activities, source organisms and country of origin. Reviews, biosynthetic studies, first syntheses, and syntheses that lead to the revision of structures or stereochemistries, have been included.
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Affiliation(s)
- John W Blunt
- Department of Chemistry, University of Canterbury, Christchurch, New Zealand.
| | - Brent R Copp
- School of Chemical Sciences, University of Auckland, Auckland, New Zealand
| | - Robert A Keyzers
- Centre for Biodiscovery, School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand
| | - Murray H G Munro
- Department of Chemistry, University of Canterbury, Christchurch, New Zealand.
| | - Michèle R Prinsep
- Chemistry, School of Science, University of Waikato, Hamilton, New Zealand
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21
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Cutignano A, Seetharamsingh B, D'Angelo D, Nuzzo G, Khairnar PV, Fusco A, Reddy DS, Fontana A. Identification and Synthesis of Mycalol Analogues with Improved Potency against Anaplastic Thyroid Carcinoma Cell Lines. JOURNAL OF NATURAL PRODUCTS 2017; 80:1125-1133. [PMID: 28263603 DOI: 10.1021/acs.jnatprod.7b00043] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The marine metabolite mycalol (1) has a specific inhibitory activity on cells of anaplastic thyroid carcinoma (ATC), a very aggressive and rare cancer that does not have effective conventional therapy. In this study, we describe six new related analogues (2-7) that differ in the length of the terminal alkyl residue and the presence of acetate or 3S-hydroxybutyrate (3S)-3HB as a substituent at C-19. Despite the structural analogies, some of the new members were significantly more cytotoxic than 1 on cell lines derived from human ATC. Structures inclusive of the 2'R,3R,4S,7R,8S,19R absolute configuration were assigned to 2-7 on the basis of detailed spectroscopic analysis, synthesis of different isomers, and application of ECD and Mosher's methods. This work led to the identification of mycalol-578 (3) as the most potent analogue, with an IC50 of 2.3 μM on FRO cells.
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Affiliation(s)
- Adele Cutignano
- Istituto di Chimica Biomolecolare, Bio-Organic Chemistry Unit, Consiglio Nazionale delle Ricerche , Via Campi Flegrei 34, 80078, Pozzuoli, Naples, Italy
| | - B Seetharamsingh
- Division of Organic Chemistry, CSIR-National Chemical Laboratory , Dr. Homi Bhabha Road, Pune, 411008, India
| | - Daniela D'Angelo
- Istituto per l'Endocrinologia e l'Oncologia Sperimentale, Consiglio Nazionale delle Ricerche , Via Pansini 5, 80131, Napoli, Italy
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Universita' degli Studi di Napoli "Federico II" , Via Pansini 5, 80131, Napoli, Italy
| | - Genoveffa Nuzzo
- Istituto di Chimica Biomolecolare, Bio-Organic Chemistry Unit, Consiglio Nazionale delle Ricerche , Via Campi Flegrei 34, 80078, Pozzuoli, Naples, Italy
| | - Pankaj V Khairnar
- Division of Organic Chemistry, CSIR-National Chemical Laboratory , Dr. Homi Bhabha Road, Pune, 411008, India
| | - Alfredo Fusco
- Istituto per l'Endocrinologia e l'Oncologia Sperimentale, Consiglio Nazionale delle Ricerche , Via Pansini 5, 80131, Napoli, Italy
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Universita' degli Studi di Napoli "Federico II" , Via Pansini 5, 80131, Napoli, Italy
| | - D Srinivasa Reddy
- Division of Organic Chemistry, CSIR-National Chemical Laboratory , Dr. Homi Bhabha Road, Pune, 411008, India
| | - Angelo Fontana
- Istituto di Chimica Biomolecolare, Bio-Organic Chemistry Unit, Consiglio Nazionale delle Ricerche , Via Campi Flegrei 34, 80078, Pozzuoli, Naples, Italy
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22
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Abstract
A short and convergent strategy for the stereoselective total synthesis of biologically active natural product carolacton has been accomplished. Our synthesis highlights the Urpi acetal aldol, Crimmins aldol, Ireland-Claisen rearrangement, TiCl4-assisted aldol followed by β-hydroxy elimination to construct C7-C8 olefin, and ring-closing metathesis as the key steps for achieving the target molecule with an overall yield of 18.8%.
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Affiliation(s)
- Tapan Kumar Kuilya
- Department of Organic Chemistry, Indian Association for the Cultivation of Science , Jadavpur, Kolkata 700032, India
| | - Rajib Kumar Goswami
- Department of Organic Chemistry, Indian Association for the Cultivation of Science , Jadavpur, Kolkata 700032, India
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23
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Guchhait S, Chatterjee S, Ampapathi RS, Goswami RK. Total Synthesis of Reported Structure of Baulamycin A and Its Congeners. J Org Chem 2017; 82:2414-2435. [DOI: 10.1021/acs.joc.6b02838] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Sandip Guchhait
- Department
of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Shamba Chatterjee
- Department
of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | | | - Rajib Kumar Goswami
- Department
of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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24
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Das S, Goswami RK. Total synthesis of marine natural products separacenes A and B. Org Biomol Chem 2017; 15:4842-4850. [DOI: 10.1039/c7ob00345e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Kuilya TK, Goswami RK. Total synthesis of cananginone C and structural revision of debilisone A. Org Biomol Chem 2016; 14:8789-8799. [PMID: 27714187 DOI: 10.1039/c6ob01671e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A short, convergent and general strategy for stereoselective total synthesis of biologically active α-substituted γ-hydroxymethyl γ-lactone based natural products cananginone C and debilisone A has been developed. The salient features of this synthesis include Cadiot-Chodkiewicz coupling, Evans allylation, Sharpless asymmetric dihydroxylation and γ-lactonization. The originally proposed structure of debilisone A has been revised.
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Affiliation(s)
- Tapan Kumar Kuilya
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
| | - Rajib Kumar Goswami
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
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Das S, Paul D, Goswami RK. Stereoselective Total Synthesis of Bioactive Marine Natural Product Biselyngbyolide B. Org Lett 2016; 18:1908-11. [DOI: 10.1021/acs.orglett.6b00713] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sayantan Das
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Debobrata Paul
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Rajib Kumar Goswami
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
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