Carbon-13 NMR spectroscopy of sesquiterpenes. 3. Synthesis and carbon-13 NMR spectral data of 4.alpha.,5.alpha.- and 4.beta.,5.beta.-epoxyeudesmanolides. Configuration and .gamma. effect of the oxirane ring
摘要:
The epoxide eudesmanolides 14-21, which constitute epimeric pairs with respect to the configuration of the oxirane ring, have been synthesized in a stereochemically unambiguous way. Comparison of their C-12 NMR spectra with those of the parent olefins 10-13 does not, however, reveal any significant correlation between the configuration of the oxirane ring and the shifts undergone by the signals of the gamma carbon atoms C-1/C-2/C-7/C-9/C-14.
Epoxidation of sesquiterpene lactones tourneforin and ludartin
作者:R. I. Dzhalmakhanbetova、M. A. Rodichev、Yu. V. Gatilov、M. M. Shakirov、G. A. Atazhanova、S. M. Adekenov
DOI:10.1007/s10600-009-9399-6
日期:2009.7
Epoxy derivatives of the sesquiterpene lactones ludartin and tourneforin were synthesized. Their structures were elucidated using spectral data and x-ray structure analysis.
合成了倍半萜内酯鲁达亭(ludartin)和土荆皮(tourneforin)的环氧衍生物。利用光谱数据和 X 射线结构分析阐明了它们的结构。