Total Synthesis and Complete Stereostructure of a Marine Macrolide Glycoside, (−)-Lyngbyaloside B
作者:Haruhiko Fuwa、Naoya Yamagata、Yuta Okuaki、Yuya Ogata、Asami Saito、Makoto Sasaki
DOI:10.1002/chem.201600341
日期:2016.5.10
that involves an acyl ketene as the reactive species. However, the NMR spectroscopic data of our synthetic material did not match those of the authentic material, which indicated that the proposed structure must be re‐examined. Inspection of the NMR spectroscopic data of the natural product and molecular mechanics calculations led us to postulate that the configuration of the C‐10, C‐11, and C‐13 stereogenic
我们已经详细描述了(-)-lyngbyaloside B的建议结构和正确结构的总合成,这有助于阐明该天然产物的完整立体结构。我们的研究始于13-脱甲基lyngbyaloside B的全合成,其中酯化/闭环复分解(RCM)策略已成功用于大环的有效构建。我们还建立了引入共轭二烯侧链和l的可靠方法鼠李糖残基到大环骨架上。但是,酯化/ RCM策略对母体天然产物无效,因为很难将位在空间上的C-13叔醇酰化。还曾在各种条件下广泛研究了癸酸的宏观化,但没有成功。我们最终通过涉及酰基乙烯酮作为反应性物种的大分子内酯化完成了(-)-lyngbyalaloside B的拟议结构的全合成。但是,我们合成材料的NMR光谱数据与真实材料的光谱数据不匹配,这表明必须重新检查提议的结构。检查天然产物的NMR光谱数据和分子力学计算后,我们推测C-10,C-11,和C-13立体定位中心在拟议的结构中分配不正确。最后,我们对(-)-lyngbyaloside