Acylated glycosides of hydroxy fatty acid methyl esters generated from the crude resin glycoside (pharbitin) of seeds of Pharbitis nil by treatment with indium(III) chloride in methanol |
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Authors: | Ono Masateru Takigawa Ayako Mineno Tomoko Yoshimitsu Hitoshi Nohara Toshihiro Ikeda Tsuyoshi Fukuda-Teramachi Emiko Noda Naoki Miyahara Kazumoto |
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Institution: | School of Agriculture, Tokai University, 5435 Minamiaso, Aso, Kumamoto 869-1404, Japan. mono@agri.u-tokai.ac.jp |
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Abstract: | Treatment of the crude ether-insoluble resin glycoside (convolvulin) from seeds of Pharbitis nil (Pharbitis Semen), called pharbitin, with indium(III) chloride in methanol provided seven oligoglycosides of hydroxy fatty acid methyl esters partially acylated by 2-methyl-3-hydroxybutyric (nilic) and 2S-methylbutyric acids. Their structures were elucidated on the basis of NMR and MS data and chemical conversions. |
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