Design, Synthesis and Hepatoprotective Activity of Analogs of the Natural Product Goodyeroside A
摘要:
Goodyeroside A 是一种从 Goodyera 物种中分离出来的天然产物,具有显著的保肝活性,其新颖的骨架是以前在其他用于治疗肝炎的合成药物中未观察到的。在此,我们报告了一种高度立体选择性的合成方法,即在羰基的 α 位上用不同的取代基合成 goodyeroside A 及相关类似物,以探索 goodyeroside A 的结构-活性关系。体外和体内研究的结果表明,5a 是一种完全乙酰化的好耶罗苷 A 化合物,值得进一步研究,以寻找新型保肝药物。
A revised mechanism for chemoselective reduction of esters with borane-dimethyl sulfide complex and catalytic sodium tetrahydroborate directed by adjacent hydroxyl group
The plausible mechanism for the reduction of the ester groups with a strong preference for one located α to the hydroxyl groups of S-malates and R,R-tartrate-based derivatives has been proposed together with some results with regard to its applications to the syntheses of chiral synthons.
A synthetic approach to the phorboxazoles – A strategy for the synthesis of the C1–C19 polyketide fragment
作者:James W. Leahy、David C. Carroll、Kate E. McElhone
DOI:10.1016/j.tetlet.2017.12.007
日期:2018.1
A syntheticapproach to the C1–C19 polyketide fragment of the phorboxazoles is disclosed here. While an initial two-directional approach was efficient, it did not proceed in a high enough yield to justify moving forward. A subsequent successful strategy for the generation of the C11–C15 pyrans of both of the phorboxazoles was achieved, and the installation of the C9 stereocenter was able to be demonstrated