Rajagopal Rao D, Gurudutt K N, Mamatha S, Mohan Rao L J
Central Food Technological Research Institute, Mysore-570 020, India.
Magn Reson Chem. 2007 Jul;45(7):578-82. doi: 10.1002/mrc.2011.
Morellic and isomorellic acids (2 and 3), present in the seed coat as well as resinous exudate of Garcinia morella Desr., are geometric isomers and structurally related to morellin (1), the major chromenoxanthone pigment. Both form crystalline complexes with pyridine and afford guttiferic acid (7), a novel skeletal rearrangement product, when heated with mild alkali. Structure of the latter has been deduced mainly by a comparative study of 1H and 13C NMR spectra of methyl morellate (5), methyl-O-methyl morellate (6), guttiferic acid (7) and dimethyl guttiferate (8).
莫雷利酸和异莫雷利酸（2和3）存在于莽吉柿（Garcinia morella Desr.）的种皮以及树脂状渗出物中，它们是几何异构体，在结构上与主要的色烯酮黄颜料莫雷林（1）相关。二者都能与吡啶形成结晶配合物，并且在与弱碱加热时会生成一种新型骨架重排产物——藤黄酸（7）。后者的结构主要是通过对莫雷酸甲酯（5）、O - 甲基莫雷酸甲酯（6）、藤黄酸（7）和藤黄酸二甲酯（8）的1H和13C NMR光谱进行对比研究推导出来的。
