Assignment of carbon-13 nuclear magnetic resonance spectra of some friedelanes
作者:Amarendra Patra、Swapan Kumar Chaudhuri
DOI:10.1002/mrc.1260250202
日期:1987.2
diacetate and friedelane‐2β‐3β‐diyl diacetate have been made. The carbon signals of 3‐oxofriedelan‐29‐ol and its acetate, methyl 3‐oxofriedelan‐29‐oate, 3‐oxofriedelan‐30‐ol, maytenfoliol, maytensifolin‐A, maytensifolin‐B, pachysonol and pristimerin reported in the literature have also been considered for their specific resonanceassignments. A few signal assignments of somefriedelanes, viz. friedelan‐28‐ol
Friedelane triterpenoids: transformations toward A-ring modifications including 2-<i>homo</i>derivatives
作者:Jayanta Das、Antara Sarkar、Pranab Ghosh
DOI:10.1039/c8nj00009c
日期:——
triterpenoid 3-chlorofriedel-2-ene-2-carbaldehyde, which was isolated as the major product from the reaction of friedelin with the novel Vilsmeier–Haack reagent. New A-ring modified derivatives were also obtained due to further interesting transformations of 3-chlorofriedel-3-ene, isolated as side products from the same reaction. Again, considering the scope of the 3-chloro-2-enal moiety associated with
Six substances were isolated from the branches and leaves of the Chinese herb Leptopus Chinensis (Bunge) Pojark. by column chromatography for the first time. Their structures were elucidated as 3α-hydroxyfriedelan-2-one, saccharose, triacontanol, friedelane-2α,3β-diols, β-sitosterol-3-O-β-D-glucoside, and β -sitosterol on the basis of x-ray, chemical, and spectroscopic methods.
通过柱层析法,首次从中草药莱菔子(Bunge)的枝叶中分离出六种物质。根据 X 射线、化学和光谱方法,阐明了它们的结构为 3α-羟基油菜素-2-酮、糖醛酸、三芳醇、油菜素-2α,3β-二醇、β-谷甾醇-3-O-β-D-葡萄糖苷和 β -谷甾醇。