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Liang Xu 《Tetrahedron》2005,61(18):4467-4474
This study described a new approach for exhaustive degradation of the ring D of maoecrystal A (1), an ent-kaurane-type diterpene from Isodon eriocalyx, in seven steps mainly involving retro-aldol reaction, epoxylation, NaIO4 oxidation, and Baeyer-Villiger process in a 19% overall yield. 相似文献
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Neng‐Yu Chen Min‐Qing Tian Rui Wu Han‐Dong Sun Chao‐Ming Li Zhong‐Wen Lin 《中国化学会会志》2000,47(2):363-366
Two new diterpenoids, Maoecrystal U and epi‐maoecrystal P , together with nine known diterpenoids and eight other known compounds were isolated from Isodon eriocalyx ( ). The structures of two new diterpenoids were elucidated as 6β‐acetoxy‐15β‐hydroxy‐3α,20‐epoxy‐ent‐kaur‐16‐ene‐1,7‐dione and 16(S)‐methoxymethy‐6β,7β‐dihydroxy‐7α,20‐epoxy‐ent‐kaur‐2,3‐ethenylene‐1,15‐dione on the basis of spectroscopic evidence, especially by 2D NMR techniques. 相似文献
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