Two triterpenoid lactones from the resin of Bursera delpechiana
摘要:
Two new triterpenoid lactones have been isolated from the resin of Bursera delpechiana and their structures assigned as 3 beta-acetoxy-11 alpha, 12 alpha-epoxyurs-28,13-olide and 3 beta-acetoxy-12 beta-hydroxyurs-28,13-olide respectively on the basis of their spectroscopic properties and chemical evidence.
Stereochemistry of hydrogen peroxide - acetic acid oxidation of ursolic acid and related compounds.
作者:Alexey V. Tkachev、Alexey Yu. Denisov、Yuri V. Gatilov、Irina Yu. Bagryanskaya、Sergey A. Shevtsov、Tatjana V. Rybalova
DOI:10.1016/s0040-4020(01)89285-1
日期:1994.1
Stereochemistry of a number of oxidized derivatives of ursolic acid was established using NMR data and X-ray analysis. Full signal assignments were made in 1H and 13C NMR spectra of 26 natural and synthetic ursane type triterpenoids. Possible mechanisms of oxidation of ursolic acid and relatedcompounds by peracids, as well as mechanisms of secondary processes, were formulated basing on chemical behavior
使用NMR数据和X射线分析确定了熊果酸的许多氧化衍生物的立体化学。在1 H和13 C NMR光谱中对26种天然和合成的类熊烷三萜类化合物进行了全信号分配。根据原料和某些中间物种的化学行为和分子力学计算,提出了乌索酸和相关化合物被过酸氧化的可能机理,以及次级过程的机理。
Two triterpenoid lactones from the resin of Bursera delpechiana
作者:Kodakandla V. Syamasundar、Gopal R. Mallavarapu
DOI:10.1016/0031-9422(95)00179-b
日期:1995.9
Two new triterpenoid lactones have been isolated from the resin of Bursera delpechiana and their structures assigned as 3 beta-acetoxy-11 alpha, 12 alpha-epoxyurs-28,13-olide and 3 beta-acetoxy-12 beta-hydroxyurs-28,13-olide respectively on the basis of their spectroscopic properties and chemical evidence.