Total Synthesis and Structural Revision of the Marine Macrolide Neopeltolide

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• 作者：Daniel W. Custar ; Thomas P. Zabawa ; Karl A. Scheidt
• 刊名：Journal of the American Chemical Society
• 出版年：2008
• 出版时间：January 23, 2008
• 年：2008
• 卷：130
• 期：3
• 页码：804 - 805
• 全文大小：72K
• 年卷期：v.130,no.3(January 23, 2008)
• ISSN：1520-5126

文摘

The total synthesis and structural revision of the marine natural product neopeltolide is reported. The key bond-forming step involves a Lewis acid-catalyzed intramolecular cyclization to install the tetrahydropyran ring and the macrocycle simultaneously. This type of cyclization is the first of its kind and assembles the carbon backbone of the natural product efficiently. The synthesis of the reported structure revealed differences in the data between the natural and synthetic material. After significant investigation, the diastereomeric molecule with the C11 and C13 configurations inverted was synthesized using the initial route. This compound matches the data reported for neopeltolide (¹H, ¹³C, HRMS, IR, NOESY, []), thereby establishing the correct overall structure for this potent macrolide natural product, including the relative and absolute stereochemistry.