[Show abstract][Hide abstract] ABSTRACT: Fructose-based 3-acetyl-2,3-dihydro-1,3,4-oxadiazole (GLB) is a novel antitumor agent and belongs to glycosylated spiro-heterocyclic oxadiazole scaffold derivative. This research first reported a simple, specific, sensitive and stable high performance liquid chromatography -ultraviolet detector (HPLC-UV) method for the quantitative determination of GLB in plasma. In this method, the chromatographic separation was achieved with a reversed phase C18 column. The calibration curve for GLB was linear at 300 nm. The lower limit of quantification was 10 ng/mL. The precision, accuracy and stability of the method were validated adequately. This method was successfully applied to the pharmacokinetic study in rats for detection of GLB after oral administration. Moreover, the structures of parent compound GLB and its two major metabolites M1 and M2 were identified in plasma using an ultra performance liquid chromatography- electrospray ionization-quadrupole-time of flight- mass spectrometry (UPLC-ESI-QTOF-MS) method. Our results indicated that the di-hydroxylation (M1) and hydroxylation (M2) of GLB are the major metabolites. In conclusion, the present study provided valuable information on an analytical method for the determination of GLB and its metabolites in rats, can be used to support further developing of this antitumor agent.
[Show abstract][Hide abstract] ABSTRACT: An efficient route to prepare L-glucose and L-galactose derivatives by using the strategy of switching the functional groups at C1 and C5 of D-glucose and D-mannose, respectively, was developed. L-Sugars could be prepared on a large scale by this strategy with high overall yields.
No preview · Article · Sep 2014 · Chinese Chemical Letters
[Show abstract][Hide abstract] ABSTRACT: An improved method for the synthesis of large and complex oligosaccharides on ionic liquid (IL) support was developed. A strategy to attach the acceptor on IL using a more stable ether linker was used to prevent undesirable decomposition and side products. A "dissolution-evaporation-precipitation" purification procedure was also developed by combining the advantages of precipitation and solid-liquid extraction to reduce mechanical loss and purification time. This approach was successfully used for the rapid assembly of ionic liquid supported homolinear α(1→2)-linked nonamannoside in 25.2% overall yield within 28.5 h.
No preview · Article · Jun 2011 · The Journal of Organic Chemistry
[Show abstract][Hide abstract] ABSTRACT: ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
[Show abstract][Hide abstract] ABSTRACT: The first total synthesis of syringalide B, 2-(4-hydroxyphenyl)ethyl 4-O-[(E)-feruloyl]-beta-D-glucopyranoside, is described. The hydroxyl groups were protected with allyloxycarbonyl (Aoc) and allyl groups, which successfully prevent the migration of the feruloyl group during the deblocking procedure.
No preview · Article · Aug 2005 · Carbohydrate Research
[Show abstract][Hide abstract] ABSTRACT: Based on the two antigenic peptides, 26-43 (P26) and 116-131 (P116), derived from 28 kDa glutathione S-transferase of Schistosoma mansoni (Sm28GST), two multiple antigenic peptides (MAPs), (P26)4-MAP and (P116)4-MAP with the same oligomeric lysine core, were synthesized by stepwise solid-phase peptide synthesis method. The antigenicities and protective effects of these two MAPs were examined on experimental animals. As shown in the dot-ELISA result, the synthetic MAPs could be recognized and bound by immunoglobins in both patient's and infected-rabbit's sera. After Kunming mice were immunized with (P26)4-MAP, the worm burden reduction rate and the liver egg reduction rate were 59.9% and 61.1%. In (P26)4-MAP or (P116)4-MAP immunized BALB/c mice, the worm burden reduction rates were 37.5% and 62.5%, respectively, and the liver egg reduction rates were 35.1% and 54.0%, respectively.
No preview · Article · Jun 2005 · Bioorganic & Medicinal Chemistry Letters