Total syntheses and absolute stereochemistry of decarestrictines C1 and C2
作者:Debendra K. Mohapatra、Gokarneswar Sahoo、Dhondi K. Ramesh、J. Srinivasa Rao、G. Narahari Sastry
DOI:10.1016/j.tetlet.2009.07.099
日期:2009.10
for decarestrictine C1 and (−)-DET for decarestrictine C2. The alcohol fragment is identical for both decarestrictines C1 and C2 and has been accessed from d-(+)-mannitol. Comparison of the 1H and 13C NMR data combined with the computational studies predicts the presence of two conformations without and with hydrogen bonding (conformational isomers I and II for decarestrictine C1), respectively. The
已经描述了去卡地汀C 1和C 2的总合成。合成策略涉及一种实用且灵活的方法,该方法使用酯化和闭环复分解来结合酸和醇片段。所述酸片段彼此为对映异构体,并通过类似的转化由1-(-)-苹果酸制备。在Sharpless不对称环氧化中,(+)-DET被用于去卡地汀C 1,(-)-DET被用于去卡地汀C 2。十碳六烯碱C 1和C 2的醇片段相同,并且已从d-(+)-甘露糖醇中获得。所述的比较1 H和1313 C NMR数据与计算研究相结合,可以预测存在两个构象,两个构象分别具有氢键和不具有氢键(去卡地丁C 1的构象异构体I和II )。脱卡因汀C 2的1 H和13 C NMR数据与Kibayashi等报道的分析数据完全吻合。
Stereoselective Total Synthesis of Stagonolide C and Formal Total Synthesis of Modiolide A
The influence of protecting groups at C4 and C7 on a ring-closing metathesis reaction was investigated. Matched induction led to the totalsynthesis of stagonolideC and the formal totalsynthesis of modiolide A.
研究了 C4 和 C7 上的保护基团对闭环复分解反应的影响。匹配诱导导致了司他内酯 C 的全合成和 modiolide A 的正式全合成。