Electrochemical nickel-catalyzed Migita cross-coupling of 1-thiosugars with aryl, alkenyl and alkynyl bromides
作者:Mingxiang Zhu、Mouad Alami、Samir Messaoudi
DOI:10.1039/d0cc01126f
日期:——
Here we report a simple route towards the synthesis of thioglycosides, in which electrochemical cross-coupling is used to form a S-C glycosidic bond from protected and unprotected thiosugars with functionalized aryl bromides under base free conditions. The reaction manifold that we report here demonstrates the power of electrochemistry to access highly complex glycosides under mild conditions.
A simple method for the preparation of aryl 1-thioglycosides is described. The reaction of D-glucose pentaacetate or 2-acetamido-2-deoxy-D-glucose tetraacetate with arenethiols in the presence of zinc chloride under fusion conditions formed their 1-thioglycosides in good yields. Some Lewis acids in addition to zinc chloride were studied as catalysts in the reaction.
Dehydrative Thioglycosylation of 1-Hydroxyl Glycosides Catalyzed by In Situ-Generated AlI<sub>3</sub>
作者:Shiue-Shien Weng、Kun-Yi Hsieh、Zih-Jian Zeng
DOI:10.1002/jccs.201600828
日期:2017.5
Thioglycosylation of 1‐hydroxyl glycosides catalyzed by in situ‐generated AlI3 from elemental aluminium and molecular iodine has been developed. This method provides an alternative route to access anomeric thioglycosides without the use of hazard Lewis acidic activators or per‐modified activated thiol sources. The major advantages of this dehydrative procedure are environmental friendly, ease of operation
Synthesis of glycosyl sulfoximines by a highly chemo- and stereoselective NH- and O-transfer to thioglycosides
作者:Arianna Tota、Claudia Carlucci、Luisa Pisano、Giuliano Cutolo、Guy J. Clarkson、Giuseppe Romanazzi、Leonardo Degennaro、James A. Bull、Patrick Rollin、Renzo Luisi
DOI:10.1039/d0ob00647e
日期:——
A synthesis of unprecedented and stable glycosyl sulfoximines is reported. The developed strategies represent the first example of highlystereoselective sulfoximine formation directly from thioglycosides. This synthetic protocol has been tested on several β-thioglycosides bearing different aromatics and alkyls as S-substituents, and bearing glucose, mannose and galactose as glycosyl units. The process
Odorless Eco-Friendly Synthesis of Thio- and Selenoglycosides in Ionic Liquid
作者:Anup Misra、Abhijit Sau
DOI:10.1055/s-0030-1260966
日期:2011.8
condition, the reductive cleavage of disulfidesand di-selenides using triethylsilane and borontrifluoridediethyletherate combination followed by the reaction of the in situgenerated -thiolate and selenoetes with glycosyl acetatederivatives in recyclable room-temperature ionic liquid, [BMIM]˙BF 4 resultedin excellent yields of thio- and selenoglycosides avoiding the useof obnoxious thiols/selenols and metallic