RuCl3·3H2O as catalyst for Ferrier rearrangement: an efficient procedure for the preparation of pseudoglycosides
作者:Peiran Chen、Lei Lin
DOI:10.1016/j.tet.2013.09.061
日期:2013.11
By using RuCl3 center dot 3H(2)O as catalyst, an improved method for the synthesis of 2,3-unsaturated-glycosides has been established. A series of 2, 3-unsaturated-glucosides were obtained from 2,4,6-tri-O-acetyl-D-glucal or 3,4-di-O-acetyl-6-deoxy-L-glucal in good yield and high anomeric selectivity. (C) 2013 Elsevier Ltd. All rights reserved.
Sm(OTf)3 as a highly efficient catalyst for the synthesis of 2,3-unsaturated O- and S-pyranosides from glycals and the temperature-dependent formation of 4-O-acetyl-6-deoxy-2,3-unsaturated S-pyranosides and 4-O-acetyl-6-deoxy-3-alkylthio glycals
作者:Peiran Chen、Dalin Zhang
DOI:10.1016/j.tet.2014.09.060
日期:2014.11
By using Sm(OTf)(3) as the catalyst, synthesis of 2,3-unsaturated-glycosides has been performed. A series of 2,3-unsaturated glycosides were obtained from 3,4,6-tri-O-acetyl-D-glucal or 3,4-di-O-acetyl-L-rhamnal under mild reaction conditions in good yield and high anomeric selectivity. It was found that under certain conditions, reaction of 3,4-di-O-acetyl-L-rhamnal with thiol leads to temperature-dependent formation of C-1-S and C-3-S product. A temperature-dependent profile of the yield of these two products is given. (C) 2014 Elsevier Ltd. All rights reserved.
Allylic rearrangement of 6-deoxyglycals having practical utility