The <sup>1</sup>H NMR Method for the Determination of the Absolute Configuration of 1,2,3-<i>p</i><i>rim</i>,<i>s</i><i>ec</i>,<i>s</i><i>ec-</i>Triols
作者:Enrique Lallana、Félix Freire、José Manuel Seco、Emilio Quiñoá、Ricardo Riguera
DOI:10.1021/ol0616135
日期:2006.9.1
comparison of the 1HNMR spectra of the tris-(R)- and the tris-(S)-MPA ester derivatives. An experimental demonstration of this correlation with 24 triols of known absolute configuration and a protocol using two parameters-Deltadelta(RS)(H3) and the difference between Deltadelta RS (H2) and Deltadelta RS (H3) = absolute value (Delta(Deltadelta RS))-for its application to the determination of the absolute
Autoxidation Reaction Mechanism for<scp>l</scp>-Ascorbic Acid in Methanol without Metal Ion Catalysis
作者:Noriko Miyake、Yuzuru Otsuka、Tadao Kurata
DOI:10.1271/bbb.61.2069
日期:1997.1
The autoxidation reaction of l-ascorbic acid (ASA) in methanol without metalioncatalysis was studied. Besides l-threonolactone (THL) and oxalic acid (OXA), methyl l-threonate, and threonic acid were identified as initial autoxidation products of ASA, which were the C(2)-C(3) fission product via the C(2) oxygen adduct of ASA. This pathway is different from the one via dehydro-l-ASA (DASA), which has
Filipendula kamtschatica is a plant utilized as a traditional medicine by Ainu people in Japan, but its chemical constituents are not much studied. Pancreatic lipase inhibitors are a promising tool for the treatment of obesity. We searched for natural lipase inhibitors from F. kamtschatica and two new compounds were isolated along with the known flavonoid glycoside. The structure elucidation of new compounds revealed these two to be 2-O-caffeoyl-4-O-galloyl-L-threonic acid and 3-O-caffeoyl-4-O-galloyl-L-threonic acid, which can be recognized as a pancreatic lipase's substrate-like structure. The isolated compounds all showed an inhibitory activity against porcine pancreatic lipase and one of the isomer, 3-O-caffeoyl-4-O-galloyl-L-threonic acid, possessed the most potent activity with IC50 value showing an order lower value compared to others. The substrate-like structure of the new compounds seemed to be important for their activity. (c) 2012 Elsevier Ltd. All rights reserved.
TOLSTIKOV, A. G.;YAMILOV, R. X., IZV. AN CCCP. CEP. XIM.,(1991) N, S. 253-254
作者:TOLSTIKOV, A. G.、YAMILOV, R. X.
DOI:——
日期:——
TOLSTIKOV, A. G.;YAMILOV, R. X.;SPIRIXIN, L. V.;XALILOV, L. M.;TOLSTIKOV,+, BIOORGAN. XIMIYA, 17,(1991) N, S. 988-993
作者:TOLSTIKOV, A. G.、YAMILOV, R. X.、SPIRIXIN, L. V.、XALILOV, L. M.、TOLSTIKOV,+