Synthesis of both enantiomers of hydroxypipecolic acid derivatives equivalent to 5-azapyranuronic acids and evaluation of their inhibitory activities against glycosidases
kinetic resolution, the synthesis of both L- and D-isomers of 3,4,5-trihydroxy- and 3-hydroxypipecolic acids was achieved. None of the compounds tested showed inhibitory activity against alpha- and beta-glucosidases. On the other hand, L-23 and L-29 were found to have potent inhibitory activity against beta-glucuronidase. In addition, it is interesting that some uronic-type azasugar derivatives showed moderate
A highly practicable synthesis of both enantiomers of 3-hydroxypipecolic acid derivatives 1, 2, 3, 4 is described. Screening of these molecules for glycosidase inhibition has been examined. Compound 3 was shown to be a potent inhibitor of beta-N-acetylglucosaminidase as well as Escherichia coli beta-glucuronidase. (C) 2008 Elsevier Ltd. All rights reserved.
A new amino acid, (2S,3R)-(-)-3-hydroxybaikiain from Russula subnigricans HONGO.
A new amino acid (I) was isolated from a toxic mushroom, Russula subnigricans HONGO, and characterized as (2S, 3R) - (-) -3-hydroxybaikiain [(2S, 3R) - (-) -1, 2, 3, 6-tetrahydro-3-hydroxypyridine-2-carboxylic acid]. (S) - (-) -Baikiain (II), (S) - (-) -pipecolic acid (III), ergosterol (IV), ergosteryl peroxide (V) and cerevisterol (VI) were also isolated and identified.