01238nas a2200157   4500008004100000022001400041245011800055210006900173260010600242300001400348490000700362520053200369100002700901700002000928856013200948       2007                        eng d  a0040-403900aPropargyl 1,2-orthoesters as glycosyl donors: stereoselective synthesis of 1,2-trans glycosides and disaccharides0 aPropargyl 12orthoesters as glycosyl donors stereoselective synth  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcSEP  a6564-65680 v483 a<p>Propargyl 1,2-orthoesters are identified as glycosyl donors. Various glycosides and disaccharides were synthesized in a stereoselective manner using AuBr3 as the promoter. AuBr3 may activate the alkyne resulting in the formation of a 1,2-dioxolenium ion and also behaves as a Lewis acid to facilitate the attack of the glycosyl acceptor. The versatility of the protocol was demonstrated using a panel of aglycones comprising aliphatic, alicyclic, steroidal and sugar alcohols. (C) 2007 Elsevier Ltd. All rights reserved.</p>1 aSureshkumar, Gopalsamy1 aHotha, Srinivas  uhttps://library.ncl.res.in/content/propargyl-12-orthoesters-glycosyl-donors-stereoselective-synthesis-12-trans-glycosides-and-0