Polyoxygenated diterpenoids of the eunicellin-type from the Chinese soft coral Cladiella krempfi
摘要:
A detailed chemical investigation of the Chinese soft coral Cladiella krempfi has yielded four new eunicellin-based diterpenoids along with five known compounds. The stereostructures of the new metabolites have been elucidated by extensive spectroscopic analysis, mainly based on 2D NMR spectroscopy, and by chemical transformations. A remarkable variation in the diterpene composition in dependence of the exact site of collection was observed. Some of the isolated diterpenoids were shown to exhibit antiproliferative activity against C6 glioma cells, multi-drug resistant tumor cell line. (c) 2012 Elsevier Ltd. All rights reserved.
Three new polyoxygenated diterpenes (1, 3 and 4) of eunicellin-type, namely, 8-n-butyryl-litophynol A, 6-keto-litophynol B and 6-epi-litophynol B, respectively, together with two related known ones (2 and 5), were isolated from the soft coral Cladiella krempfi collected off the Weizhou island, Guangxi Zhuang Autonomous Region, China. The structures of the new compounds were elucidated by extensive
Polyoxygenated diterpenoids of the eunicellin-type from the Chinese soft coral Cladiella krempfi
作者:You-Sheng Cai、Li-Gong Yao、Antonio Di Pascale、Carlo Irace、Ernesto Mollo、Orazio Taglialatela-Scafati、Yue-Wei Guo
DOI:10.1016/j.tet.2012.12.051
日期:2013.3
A detailed chemical investigation of the Chinese soft coral Cladiella krempfi has yielded four new eunicellin-based diterpenoids along with five known compounds. The stereostructures of the new metabolites have been elucidated by extensive spectroscopic analysis, mainly based on 2D NMR spectroscopy, and by chemical transformations. A remarkable variation in the diterpene composition in dependence of the exact site of collection was observed. Some of the isolated diterpenoids were shown to exhibit antiproliferative activity against C6 glioma cells, multi-drug resistant tumor cell line. (c) 2012 Elsevier Ltd. All rights reserved.