Highly β-stereoselective glycosylations of glycosyl acceptors having a primary hydroxyl group by using a novel glycosyldonor, α-glycosyl 6-nitro-2-benzothiazoate (3), proceeded smoothly in the presence of a catalytic amount of trifluoromethanesulfonic acid (TfOH) in CH2Cl2 at −78 °C to afford the corresponding glycosides in high yields. The donor 3 gave β-saccharides more dominantly compared with
Anti-inflammatory marine cyclic peptide stylissatin A and its derivatives inhibit differentiation of murine preadipocytes
作者:Menghua Zhang、Taiki Sunaba、Yiting Sun、Kazunori Sasaki、Hiroko Isoda、Hideo Kigoshi、Masaki Kita
DOI:10.1039/c9cc02517k
日期:——
Stylissatin A, an anti-inflammatory cyclic heptapeptide, and itsderivatives potently inhibited the differentiation of preadipocytes and reduced triglyceride accumulation in mature adipocytes, with little cytotoxicity. Our studies might contribute to the development of leads for new anti-inflammatory and anti-obesity agents.
The first total synthesis of pelargonidin 3-O-6 ''-O-acetyl-beta-D-glucopyranoside, an acylated anthocyanin of magenta-col-ored Verbena flowers, was successfully carried out. The key intermediate, protected kaemferol 3-O-glucoside, was constructed by the Baker-Venkataraman rearrangement from a glycosyloxyacetophenone followed by Zn-Hg reduction to the corresponding acylated anthocyanin. (C) 2007 Elsevier Ltd. All rights reserved.
Highly α-Stereoselective One-pot Sequential Glycosylation Using Glucosyl Thioformimidate Derivatives
作者:Hiroyuki Chiba、Teruaki Mukaiyama
DOI:10.1246/cl.2003.172
日期:2003.2
Several trisaccharides were prepared by efficient highly α-stereoselective one-pot sequential glycosylation using glucosyl p-trifluoromethylbenzylthio-p-trifluoromethylphenyl formimidates (abbreviated to: glucosyl thioformimidates) in the presence of a catalytic amount of TfOH. Factors that controlled the high α-stereoselectivity were determined by characteristic properties of thioformimidate groups contained both in glucosyl donor and acceptor.