A new series of salicyl glycoconjugates containing hydrazide and hydrazone moieties were designed and synthesized. The bioassay indicated that the novel compounds had no in vitro fungicidal activity but showed significant in vivo antifungal activity against the tested fungal pathogens. Some compounds even had superior activity than the commercial fungicides in greenhouse trial. The results of RT-PCR analysis showed that the designed salicyl glycoconjugates could induce the expression of LOX1 and Cs-AOS2, which are the specific marker genes of jasmonate signaling pathway, to trigger the plant defense resistance.
hydrazone derivatives would improve after modification with sugars while keeping or modulating their notable biological activities, we designed and synthesized some glycosyl hydrazine and hydrazone derivatives. Bioassay results indicated that the antitumor activity of our previously prepared hydrazones reduced or disappeared after modification with sugars. On the contrary, some glycosyl derivatives displayed
o-Methoxycarbonylphenyl 2,3,4,6-tetra-O-benzyl-1-thio-β-d-galactoside 1 was designed and demonstrated to serve as a non-malodorous thioglycosyl donor in α-selective glycosylation reactions with 4-OH galactoside and 4′-OH lactoside to give globosyl Gb2 and Gb3 saccharides, respectively.
Evaluating the reactivity and stereoselectivity of salicyl-type thioglycosides as non-malodorous thioglycoside alternatives for oligosaccharide synthesis
just recently, a pair of beta-glycolipids was isolated from the cell membrane of Mycoplasma pneumoniae as a mixture of the two compounds. They are the major immunodeterminants of this pathogenic Mycoplasma and indicate high medicinal potential. They have a beta-(1 -> 6)-linked disaccharide structure close to each other: one has beta-D-galactopyranoside (beta-Gal-type 1) at the non-reducing terminal, and another has beta-D-glucopyranoside (beta-Glc-type 2). In the present Study, the first stereoselective synthesis was conducted for each of the two beta-glycolipids 1 and 2. H-1 NMR and TLC-immunostaining studies of the synthetic compounds enable LIS to establish the absolute structures having the beta-(1 -> 6)-linked disaccharides at the glycerol sn-3 position. (C) 2008 Elsevier Ltd. All rights reserved.