(+)-Zwittermicin A. Rapid assembly of C9-C15 and a formal total synthesis.

作者: Evan W. Rogers , Tadeusz F. Molinski

DOI: 10.1021/JO901007V

关键词: EpoxideTotal synthesisChemistryDesymmetrizationEnantiomerEnantioselective synthesisStereochemistrySharpless epoxidationChemical synthesisAzide

摘要: A short, enantioselective synthesis of the C9-C15 portion (+)-zwittermicin is reported that exploits directional functionalization known hepta-2,5-diyne-1,7-diol by partial reduction two triple bonds followed Sharpless asymmetric epoxidation and boron-directed double ring-opening with sodium azide under Miyashita conditions. Subsequent desymmetrization C(2)-symmetric diazidotetraol product converges upon (-)-3--the enantiomer key intermediate our earlier structural proof (-)-zwittermicin A--and constitutes a formal (+)-zwitttermicin A.

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