Total Syntheses of Highly Oxidized <i>ent</i>-Kaurenoids Pharicin A, Pharicinin B, 7-<i>O</i>-Acetylpseurata C, and Pseurata C: A [5+2] Cascade Approach
作者:Chi He、Jialei Hu、Yubing Wu、Hanfeng Ding
DOI:10.1021/jacs.7b02746
日期:2017.5.3
ent-kaurene diterpenoids. By incorporation of the subsequent retro-aldol/aldol process and singlet oxygen ene reaction, this concise and convergent approach has enabled the first asymmetric totalsyntheses of pharicin A, pharicinin B, 7-O-acetylpseurata C, and pseurata C.
前所未有的氧化脱芳构化诱导的 [5+2] 环加成/频哪醇型 1,2-酰基迁移级联有效地生成季碳中心并组装高度氧化的双环 [3.2.1] 辛烷骨架对映贝壳杉烯二萜。通过结合随后的逆醛醇/醛醇过程和单线态氧烯反应,这种简洁而收敛的方法使 pharicin A、pharicinin B、7-O-乙酰假单胞菌 C 和假单胞菌 C 的第一个不对称全合成成为可能。
Synthesis of Manool-Related Labdane Diterpenes as Platelet Aggregation Inhibitors.
Enantioselective total synthesis of the labdane diterpene (-)-1, was achieved starting from the R-(-)-enantiomer of the Wieland-Miescher ketone. The enantiomer (+)-1 was obtained by partial synthesis via microbial transformation of sclareol. These results established that the natural compound (+)-1, a platelet aggregation inhibitor, has a normal absolute stereochemistry like that of manool. The B-norlabdane-related