the first examples of β-calacorene-based meroterpenoids. Their structures and absolute configurations were determined by a combination of NMR and ECD spectroscopy and X-ray diffraction analysis. On the basis of ECD data analysis for isolated and synthesized compounds, an empirical rule was proposed to determine the absolute configuration at C-7′ of syncarpic acid-conjugated terpenoids. Additionally
三个新的syncarpic酸缀合
倍半萜,tomentodiones E-G(1 - 3)和六个新syncarpic酸共轭类单萜,tomentodiones H-M(4 - 9)中,从叶分离的桃
金娘。化合物1 - 3代表了基于β-甘草香素的类
胡萝卜素的第一个例子。它们的结构和绝对构型是通过NMR和
ECD光谱法以及X射线衍射分析的组合来确定的。在对分离和合成的化合物进行
ECD数据分析的基础上,提出了经验法则来确定共轭酸共轭
萜类化合物在C-7'处的绝对构型。此外,对多药耐药性对人
阿霉素耐药的人乳腺癌细胞的逆转作用的研究表明,非细胞毒性(+)- 4发挥了最强的
阿霉素敏感性增强作用,在浓度为30μM时增强了16.5倍。