Gem-difluoromethylated and trifluoromethylated derivatives of DMDP-related iminosugars: synthesis and glycosidase inhibition
作者:Yi-Xian Li、Kyoko Kinami、Yuki Hirokami、Atsushi Kato、Jia-Kun Su、Yue-Mei Jia、George W. J. Fleet、Chu-Yi Yu
DOI:10.1039/c5ob02474a
日期:——
DMDP-related iminosugars have been synthesized from cyclic nitrones 12, 13, 18, ent-18 or 23 and nitrone-derived aldehydes 20 or ent-20. The fluorinated iminosugars were assayed against various glycosidases, and ent-8 showed moderate but selective α-L-rhamnosidase inhibition. Difluoro or trifluoro units influenced the inhibitory activities of iminosugars in a more complex manner than single fluoro substitution
Synthesis and Glycosidase Inhibition of Australine and Its Fluorinated Derivatives
作者:Yi-Xian Li、Yousuke Shimada、Kasumi Sato、Atsushi Kato、Wei Zhang、Yue-Mei Jia、George W. J. Fleet、Min Xiao、Chu-Yi Yu
DOI:10.1021/ol503728e
日期:2015.2.6
d-arabinose-derived cyclic nitrone 11. Fluorination at the C-7 position enhanced the inhibition against A. niger α-glucosidase, and this constitutes the first example of fluorination substitution for a hydroxyl increasing the inhibition of any glycosidases. The enantiomers synthesized from nitrone ent-11 showed no inhibition of the corresponding enzymes.
l-DMDP, l-homoDMDP and their C-3 fluorinated derivatives: synthesis and glycosidase-inhibition
作者:Yi-Xian Li、Mu-Hua Huang、Yukiko Yamashita、Atsushi Kato、Yue-Mei Jia、Wu-Bao Wang、George W. J. Fleet、Robert J. Nash、Chu-Yi Yu
DOI:10.1039/c0ob01063d
日期:——
L-DMDP and L-homoDMDP, the enantiomers of naturally occurring DMDP and homoDMDP have been synthesized from D-xylose derived cyclic nitrone 9. Their 3-deoxy-3-fluorinated analogues were also obtained from polyhydroxylated fluorinated cyclic nitrone 10, which was prepared from fluorinated sugar 12 in seven steps. Bioactivities of these iminosugars against various glycosidases were evaluated. While L-DMDP and L-homoDMDP are potent inhibitors of α-glucosidases, a sharp decrease of inhibition was found when the C-3 hydroxyl group of these compounds was replaced by fluoride, which showed the great importance of the C-3 hydroxyl in their interaction with enzymes.