The Absolute Configuration of 1-(3‘,4‘-Dihydroxycinnamoyl)cyclopentane-2,3-diol from the Amazonian Tree <i>Chimarrhis </i><i>t</i><i>urbinata</i>
作者:Carmen Lucia Cardoso、Vanderlan da Silva Bolzani、Dulce Helena Siqueira Silva、Hideki Ishii、Nina Berova、Koji Nakanishi
DOI:10.1021/np050522y
日期:2006.7.1
4'-dihydroxyphenyl)acrylate (1)], and two known trans- and cis-chlorogenic acid methyl esters were isolated from the ethanolic extract of the leaves of Chimarrhis turbinata. The relative configuration of 1 was determined by NMR and by comparison of the circular dichroic spectrum (CD) with those of the enantiomers of synthetic 3',4'-dimethoxycinnamoyl analogues. The absolute configuration of one of
抗氧化剂1-(3',4'-二羟基肉桂酰基)环戊烷-2,3-二醇[或(E)-2,3-二羟基环戊基-3-(3',4'-二羟基苯基)丙烯酸酯(1)],从知母叶的乙醇提取物中分离出两种已知的反式和顺式绿原酸甲酯。1的相对构型是通过NMR确定的,并且通过将圆二色性光谱(CD)与合成的3',4'-二甲氧基肉桂酰基类似物的对映异构体的那些进行比较。使用CD激子手性法确定了一种合成对映异构体的绝对构型。这样就确定了天然存在的1的结构为(E)-2,3-二羟基环戊基-3-(3',4'-二羟基苯基)丙烯酸酯。