作者:Jun Deng、Shupeng Zhou、Wenhao Zhang、Jian Li、Ruofan Li、Ang Li
DOI:10.1021/ja503972p
日期:2014.6.11
The first totalsyntheses of taiwaniadducts B, C, and D have been accomplished. Two diterpenoid segments were prepared with high enantiopurity, both through Ir-catalyzed asymmetric polyene cyclization. A sterically demanding intermolecularDiels-Alderreaction promoted by Er(fod)3 assembled the scaffold of taiwaniadducts B and C. A carbonyl-ene cyclization forged the cage motif of taiwaniadduct D at
台湾加合物B、C和D的首次全合成已经完成。通过 Ir 催化的不对称多烯环化制备了两个具有高对映纯度的二萜链段。由 Er(fod)3 促进的空间要求严格的分子间 Diels-Alder 反应组装了台湾加合物 B 和 C 的支架。羰基-烯环化在后期形成了台湾加合物 D 的笼状基序,提供了超过 200 毫克的这种化合物。
DITERPENOID QUINONES OF INULA ROYLEANA D. C.
作者:O. E. Edwards、G. Feniak、M. Los
DOI:10.1139/v62-232
日期:1962.8.1
dehydroroyleanone, and the acetoxyroyleanone was established as follows. Catalytic hydrogenation of the dehydroroyleanone (2 moles of hydrogen were talten up) followed by oxidatioil of the product by air gave royleanone. This indicated that dehydroroyleanone differed froin royleanone only in having an additional double bond. A comparison of the ultraviolet spectra of royleanone (XgIsH 277, 283 (shoulder)