11(15->1)abeo-taxane-1,4,7,9-tetraacetoxy-10-benzoyloxy 在
吡啶 、 甲基磺酰氯 作用下,
以99%的产率得到13,15-epoxy-13-epi-taxayunnasin A
参考文献:
名称:
Taxoids from Taxus chinensis
摘要:
Two new taxoids, 13,15-epoxy-13-epi-taxayunnasin A (1) and taxchinin N (2), were isolated from the leaves and stems of Taxus chinensis. Compound 2 is the first taxoid to be reported with an alpha,beta-unsaturated lactone at C-4, C-5, C-20, and C-2. The structure of 1 was elucidated by spectroscopic analysis and confirmed by semisynthesis from taxayunnasin A, while 2 was determined structurally using spectroscopic methods and by single-crystal X-ray diffraction.