Phenylsulfonylethylidene (PSE) acetals as atypical carbohydrate-protective groups
作者:Florence Chéry、Patrick Rollin、Ottorino De Lucchi、Sergio Cossu
DOI:10.1016/s0040-4039(00)00199-4
日期:2000.4
We introduce a new class of arylsulfonylated cyclic acetals derived from carbohydrate structures which are synthesized with high yields under basic conditions. Deprotection methods for such acetals are also investigated. (C) 2000 Elsevier Science Ltd. All rights reserved.
Carbohydrate-derived PSE acetals: controlled base-induced ring cleavage
作者:Florence Chéry、Elena Cabianca、Arnaud Tatibouët、Ottorino De Lucchi、Patrick Rollin
DOI:10.1016/j.tet.2011.11.009
日期:2012.1
Retro-Michael type reactions applied to PSE acetals protecting monosaccharides led either to complete removal or to ring-cleavage. In protic medium, application of standard basic conditions resulted in acetal deprotection, while the use of butyl lithium in aprotic medium allowed controlled ring-cleavage. A regio-and stereoselective C- over O-alkylation was observed during the process. Furthermore, depending on the substrates and the reaction conditions involved, new carbohydrate-derived beta-alkoxyvinyl sulfones were obtained with varying regioselectivity. (C) 2011 Elsevier Ltd. All rights reserved.
Phenylsulfonylethylidene (PSE) Acetals: A Novel Protective Group in Carbohydrate Chemistry
作者:Florence Chéry、Patrick Rollin、Ottorino De Lucchi、Sergio Cossu
DOI:10.1055/s-2001-10817
日期:——
A range of sugar-derived phenylsulfonylethylidene acetals were easily obtained from the corresponding diols and 1,2-bis(phenylsulfonyl)ethylene under basic conditions. Deprotection methods for such acetals have also been investigated.
Reductive opening of carbohydrate phenylsulfonylethylidene (PSE) acetals
作者:Florence Chéry、Elena Cabianca、Arnaud Tatibouët、Ottorino De Lucchi、Thisbe K. Lindhorst、Patrick Rollin
DOI:10.1016/j.carres.2015.09.011
日期:2015.11
carbohydrate-derived phenylsulfonylethylidene (PSE) acetals show a different behavior in reductive desulfonylation than simple symmetrical acetals. Here we have investigated various SET-type reaction conditions in order to open PSE acetals regioselectively and to produce chiral omega-hydroxyethenyl ethers. Whereas sodiumamalgam leads to a mixture of regioisomeric vinyl ethers besides the ethylidene acetal, samarium