Total Synthesis of (±)-Jiadifenin and Studies Directed to Understanding Its SAR: Probing Mechanistic and Stereochemical Issues in Palladium-Mediated Allylation of Enolate-Like Structures
作者:David A. Carcache、Young Shin Cho、Zihao Hua、Yuan Tian、Yue-Ming Li、Samuel J. Danishefsky
DOI:10.1021/ja056980a
日期:2006.1.1
carbonate, we could probe, for the first time, the stereochemical relationship between the inter- and intramolecular versions of this process. The existence of concurrent inter- and intramolecular allylation reactions was demonstrated by deuteration experiments. While in the particular case at hand, we find very little difference in stereochemical outcome as one partitions between the inter- and intramolecular
加地芬宁的全合成已完成。该合成使我们能够建立一个 SAR 谱,这表明从指定潜在药物的角度来看,加地芬宁骨架可能不如其重排前体的骨架更理想。加地芬宁问题的关键步骤涉及构建两个与 1,3 相关的季碳。该论文描述了在这种情况下如何管理立体化学。该问题在当时由钯介导的碳酸烯丙酯转移过程引起的新烯丙基转移反应的水平上进行了相当详细的研究。通过使用外部氘代碳酸二烯丙酯,我们可以首次探索该过程的分子间和分子内形式之间的立体化学关系。氘化实验证明了同时存在的分子间和分子内烯丙基化反应。虽然在手头的特殊情况下,我们发现立体化学结果的差异很小,因为分子间和分子内途径之间的一个分区,所采用的技术适用于其他系统。