Stereoselective Synthesis of Donor-Acceptor Cyclopropapyranone by Intramolecular Cyclopropanation of Vinylogous Carbonates: Application to the Total Synthesis of (±)-Diospongin B |
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Authors: | Santosh J Gharpure Sumit P Mane Laxmi Narayan Nanda Manoj Kumar Shukla |
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Affiliation: | Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076 India |
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Abstract: | An intramolecular, stereoselective cyclopropanation of vinylogous carbonates with carbenes using copper catalyst is developed for the synthesis of donor-acceptor substituted cyclopropapyranones. Completely regioselective ring cleavage of each of the cyclopropane bonds was achieved under suitable reaction conditions, leading to a diverse array of cyclic ethers. The developed method is utilized in the total synthesis of (±)-diospongin B. |
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Keywords: | carbenes cyclic ether diazoketone diospongin B donor-acceptor systems |
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