Total Synthesis of 10-Deoxymethynolide, the Aglycon of the Macrolide Antibiotic 10-Deoxymethymycin
摘要:
A short and efficient total synthesis of 10-deoxymethynolide (2c), the aglycon of 10-deoxymethymycin (1c), has been accomplished in 16 steps and 12% overall yield from (S)-3-O-p-toluenesulfonyl-3-hydroxy-2-methylpropanal (15c). The synthesis features an expeditious preparation of (+)-5a, a synthetic equivalent of the Prelog-Djerassi lactonic acid, and the construction of a 12-membered lactone through an intramolecular Nozaki-Hiyama-Kishi coupling reaction.
Total Synthesis of 10-Deoxymethynolide, the Aglycon of the Macrolide Antibiotic 10-Deoxymethymycin
摘要:
A short and efficient total synthesis of 10-deoxymethynolide (2c), the aglycon of 10-deoxymethymycin (1c), has been accomplished in 16 steps and 12% overall yield from (S)-3-O-p-toluenesulfonyl-3-hydroxy-2-methylpropanal (15c). The synthesis features an expeditious preparation of (+)-5a, a synthetic equivalent of the Prelog-Djerassi lactonic acid, and the construction of a 12-membered lactone through an intramolecular Nozaki-Hiyama-Kishi coupling reaction.
Chemoenzymatic Synthesis of the Polyketide Macrolactone 10-Deoxymethynolide
作者:Courtney C. Aldrich、Lakshmanan Venkatraman、David H. Sherman、Robert A. Fecik
DOI:10.1021/ja0504340
日期:2005.6.1
the natural product 10-deoxymethynolide. A steady-state kinetic analysis of the hexaketidechain intermediate with Pik TE was done. A preliminary substrate specificity study with unnatural hexaketide analogues was accomplished, demonstrating the importance of total synthesis in obtaining access to advanced polyketide intermediates. The results show the sensitivity of Pik TE to minor substrate modifications
聚酮合酶衍生的皮克霉素硫酯酶 (Pik TE) 具有独特的催化 12 和 14 元大环内酯环化的能力。在这项研究中,天然六酮链延长中间体作为其 N-乙酰半胱胺 (NAC) 硫酯的全合成已经实现,其与 Pik TE 的反应证明了 Pik TE 催化其大环内酯化成天然产物 10-脱氧甲炔内酯。使用 Pik TE 对六酮链中间体进行稳态动力学分析。完成了对非天然六酮化合物类似物的初步底物特异性研究,证明了全合成在获得高级聚酮化合物中间体方面的重要性。结果表明 Pik TE 对微小的底物修饰敏感,
Formal Total Synthesis of the Polyketide Macrolactone Narbonolide
作者:Lakshmanan Venkatraman、Courtney C. Aldrich、David H. Sherman、Robert A. Fecik
DOI:10.1021/jo050924a
日期:2005.9.1
An improved synthesis of (3S)-3-dihydronarbonolide is reported that constitutes a formal total synthesis of the 14-membered macrolactone antibiotic narbonolide. The key step was an intramolecular Nozaki−Hiyama−Kishi coupling to accomplish macrocyclization in improved yield. The high level of convergence will also allow us to rapidly synthesize narbonolide analogues for the study of enzymes in the pikromycin