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Mandal S, Mahananda D, Paladugu D, Thirupathi B. Total Synthesis and Determination of the Absolute Configuration of Berkeleylactone I. J Org Chem 2024; 89:4165-4175. [PMID: 38439518 DOI: 10.1021/acs.joc.4c00178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2024]
Abstract
Herein, we report the first total synthesis of berkeleylactone I and its 12S diastereomer. Consequently, this chemical synthesis allowed us to establish the unknown absolute stereochemistry at the C-12 center as 12R, which was unidentified by the isolation group. This synthetic approach includes several critical reactions, such as the Sharpless asymmetric dihydroxylation, Baran's Ni-catalyzed alkyl-alkyl cross-coupling reaction, Brown allylation, Mitsunobu reaction, and ring-closing metathesis, as key steps.
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Affiliation(s)
- Sudip Mandal
- Department of Chemical Sciences, Indian Institute of Science Education and Research Berhampur, Transit Campus, Government ITI Building, NH 59, Engineering School Road, Ganjam District, Berhampur 760 010, Odisha, India
| | - Dora Mahananda
- Department of Chemical Sciences, Indian Institute of Science Education and Research Berhampur, Transit Campus, Government ITI Building, NH 59, Engineering School Road, Ganjam District, Berhampur 760 010, Odisha, India
| | - Dileep Paladugu
- Department of Chemical Sciences, Indian Institute of Science Education and Research Berhampur, Transit Campus, Government ITI Building, NH 59, Engineering School Road, Ganjam District, Berhampur 760 010, Odisha, India
| | - Barla Thirupathi
- Department of Chemical Sciences, Indian Institute of Science Education and Research Berhampur, Transit Campus, Government ITI Building, NH 59, Engineering School Road, Ganjam District, Berhampur 760 010, Odisha, India
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Mandal S, Mahananda D, Dey S, Bharathavikru RS, Thirupathi B. Total Synthesis, Revised Structure, and Biological Evaluation of Elgonene B and Analogues. JOURNAL OF NATURAL PRODUCTS 2024; 87:152-159. [PMID: 38109514 DOI: 10.1021/acs.jnatprod.3c00988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2023]
Abstract
Herein, we report the first total synthesis of elgonene B and its congeners, thus resulting in a revision of the configuration at the C-6 carbon of the originally proposed structure of elgonene B. This synthetic approach demonstrates the utility of several important reactions such as the chiral oxazaborolidinium ion-catalyzed Diels-Alder reaction, Ando's Horner-Wadsworth-Emmons olefination, and the intermolecular Nozaki-Hiyama-Kishi reaction as key steps. Additionally, the study explores the cytotoxic and antibacterial activities of elgonene B and its congeners (1-4).
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