TITLE:
Microtropins J-P: 6’-O-(2”S,3”R)-2”-Ethyl-2”,3”-Dihydroxybutyrates of Phenolic Alcohol ß-D-Glucopyranosides from the Branches of Microtropis japonica
AUTHORS:
Yuka Uemura, Sachiko Sugimoto, Katsuyoshi Matsunami, Hideaki Otsuka, Yoshio Takeda
KEYWORDS:
Microtropis japonica; Celastraceae; Microtropin; (2S, 3R)-2-Ethyl-2, 3-Dihydroxybutyrate
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.4 No.10,
October
9,
2013
ABSTRACT: From the
branches of Microtropis japonica (Celastraceae), seven phenolic alcohol glucosides, named microtropins J-P (1-7), were isolated. The
6-position of glucose was esterified with 2-ethyl-2,3-dihydroxybutyric acid.
Microtropin K (2) was hydrolyzed
under a mild basic condition to give methyl (2S,3R)-2-ethyl-2,3-dihydroxybutyrate,
whose absolute structure was determined by the comparison of NMR data and
the optical rotation value with that reported.