We described a novel palladium-catalyzed domino procedure for the preparation of (hetero)aryl thio/selenoglycosides. Readily available (hetero)aryl iodides and easily accessible 1-thiosugars/1-selenosugars are utilized as the substrates. Meanwhile, 10 types of sugars are quite compatible with this reaction with good regio- and stereoselectivity, high efficiency, and broad applicability (up to 89%,
Convenient syntheses of 1,2-trans selenoglycosides using isoselenuronium salts as glycosylselenenyl transfer reagents
作者:Ambati Ashok Kumar、Tünde Zita Illyés、Katalin E. Kövér、László Szilágyi
DOI:10.1016/j.carres.2012.07.012
日期:2012.10
temperature to afford the corresponding selenoglycosides in good yields. Aryl halides react to appreciable extent only if bearing activating nitro groups on the aromatic ring. Reactions with acylating reagents such as acetic anhydride and benzoyl chlorides furnished anomeric selenoesters some of which were recently proposed as starting compounds for alternative selenoglycoside syntheses. Selenodisaccharides
Atom-Economic Synthesis of Unsymmetrical <i>gem</i>-Diarylmethylthio/Seleno Glycosides via Base Mediated C(O)–S/Se Bond Cleavage and Acyl Transfer Approach of Glycosylthio/Selenoacetates
作者:Zanjila Azeem、Pintu Kumar Mandal
DOI:10.1021/acs.joc.2c02704
日期:2023.2.3
atom economic method that streamlines the scission of the C(O)–S/Se bond involving the in situ generation of an anomeric thiolate/selenolate anion, which reacted with p-QMs to yield novel unsymmetrical gem-diarylmethylthio/seleno glycosides while retaining the anomeric stereochemistry. Notably, the key features of this protocol involve unprecedented long-range acyl transfer (from S/Se to O), thus affording