Absolute Configuration of (13<i>R</i>)- and (13<i>S</i>)-Labdane Diterpenes Coexisting in <i>Ageratina jocotepecana</i>
作者:Edgar García-Sánchez、César B. Ramírez-López、Armando Talavera-Alemán、Alejandra León-Hernández、Rosa E. Martínez-Muñoz、Mauro M. Martínez-Pacheco、Mario A. Gómez-Hurtado、Carlos M. Cerda-García-Rojas、Pedro Joseph-Nathan、Rosa E. del Río
DOI:10.1021/np500022w
日期:2014.4.25
9S,10S,13S)-labd-7-en-15-oic acid (1), methyl (−)-(5S,9S,10S,13S)-labd-7-en-15-oate (2), (+)-(5S,8R,9R,10S,13R)-8-hydroxylabdan-15-oic acid (3), and (−)-(5S,9S,10S,13Z)-labda-7,13-dien-15-oic acid (5). The coexistence of (13R)- and (13S)-labdanes in this member of the Asteraceae family was demonstrated by vibration circular dichroism measurements of ester 2 and methyl (+)-(5S,8R,9R,10S,13R)-8-hydroxylabdan-15-oate
对苦艾草的正己烷提取物进行化学研究,得到(-)-(5 S,9 S,10 S,13 S)-labd-7-en-15-oic acid(1),甲基(-)-(5 S,9 S,10 S,13 S)-labd-7-en-15-oate(2),(+)-(5 S,8 R,9 R,10 S,13 R)-8-hydroxylabdan-15 -oic acid(3)和(-)-(5 S,9 S,10 S,13 Z)-labda-7,13-dien-15-oic acid(5)。(13共存- [R )-和(13小号)-labdanes在菊科的此件是通过酯的振动圆二色性测量表明2和甲基(+) - (5小号,8 - [R,9 - [R,10小号与DFT B3LYP / DGDZVP计算的光谱相比,, 13 R)-8-羟基labdan-15-酸盐(4)。此外,用HClO 4在MeOH中的1和3转化生成差向异构的甲基(+)-(5