作者:Feng Zhu、Eric Miller、Shuo-qing Zhang、Duk Yi、Sloane O’Neill、Xin Hong、Maciej A. Walczak
DOI:10.1021/jacs.8b11211
日期:2018.12.26
We report a stereoretentive cross-coupling reaction of configurationally stable nucleophiles with disulfide and N-sulfenylsuccinimide donors promoted by Cu(I). We demonstrate the utility of this method in the synthesis of thioglycosides derived from simple alkyl and aryl thiols, thioglycosides, and in the glycodiversification of cysteine residues in peptides. These reactions operate well with carbohydrate
Electrochemically Generated ArS(ArSSAr)<sup>+</sup>B(C<sub>6</sub>F<sub>5</sub>)<sub>4</sub><sup>−</sup>as an Activator of Thioglycosides for Glycosylation
作者:Kodai Saito、Yoshihiro Saigusa、Toshiki Nokami、Jun-ichi Yoshida
DOI:10.1246/cl.2011.678
日期:2011.7.5
Electrochemically generated ArS(ArSSAr)+ was found to be an effective activator for glycosylation of thioglycosides. Efficiency of the reaction strongly depends on the nature of the counter anion, and B(C6F5)4− was the most effective among those examined. The method was applicable to various glyocosyl donors including thiogalactosides and thiomannosides and various acceptors including those having secondary hydroxy groups.
copper-catalyzed cross-coupling of glycosyl thiosulfonate and boronic acid for the construction of thioglycosides is described. The good functional group compatibility of this method allows the preparation of many bioactive aryl/alkenyl thioglycosides, including the hSGLT1 inhibitor.
Indirect Cation-Flow Method: Flash Generation of Alkoxycarbenium Ions and Studies on the Stability of Glycosyl Cations
作者:Kodai Saito、Koji Ueoka、Kouichi Matsumoto、Seiji Suga、Toshiki Nokami、Jun-ichi Yoshida
DOI:10.1002/anie.201100854
日期:2011.5.23
Go with the flow: The indirect cation‐flow method based on the generation of highly reactive organic cations from their precursors using electrochemically generated [ArS(ArSSAr)]+ was developed in flow microreactor systems (see scheme; Bn=benzyl, M=micromixer, R=microtube reactor). The method was applied to evaluate glycosyl cations such as A or their equivalents and glycosylation reactions.