The use of ultrastable Y zeolites in the Ferrier rearrangement of acetylated and benzylated glycals
作者:Pieter Levecque、David W. Gammon、Pierre Jacobs、Dirk De Vos、Bert Sels
DOI:10.1039/b921051b
日期:——
The Ferrier rearrangement of a selection of protected glycals was successfully performed using a commercially available H-USY zeolite CBV-720 as catalyst, selected after screening a range of similar catalysts. By incorporating either alcohols, thiophenol, trimethylsilyl azide or allyltrimethylsilane in the reaction it was shown that a range of O-, S-, N- and C-glycosides could be formed. With benzylated glucal and galactal in particular, use of the CBV-720 catalyst led to significantly higher yields of the 2,3-dehydroglycosides than previously reported.
作者:Federico G. De Las Heras、Ana San Felix、Piedad Fernández-Resa
DOI:10.1016/s0040-4020(01)88571-9
日期:1983.1
presence of a Lewis acid (SnCl4, BF3) as catalyst to give anomeric pairs of 2,3-dideoxy-hex-2-enopyranosyl cyanides and 3-deoxy-hex-2-enopyranosyl cyanides. These 2,3-unsaturated glycopyranosyl cyanides were hydrogenated over to afford the corresponding 2,3-dideoxy- and 3-deoxy-hexopyranosyl cyanides.
electrochemical reactor that accomplishes electrolysis within a few seconds was developed, enabling flash generation of short-lived carbocations and trapping reaction with nucleophiles before they decompose. The present methodology was applied to highly reactive oxocarbenium ions, N-acyliminium ions, glycosyl cations, and the Ferrier cations. Moreover, continuous and flash synthesis of a pharmaceutical
An eco-friendly tandem tosylation/Ferrier N -glycosylation of amines catalyzed by Er(OTf) 3 in 2-MeTHF
作者:Monica Nardi、Natividad Herrera Cano、Antonio De Nino、Maria Luisa Di Gioia、Loredana Maiuolo、Manuela Oliverio、Ana Santiago、Diletta Sorrentino、Antonio Procopio
DOI:10.1016/j.tetlet.2017.03.047
日期:2017.5
Er(OTf)(3) in 2-MeTHF provides a new and eco-friendly process for Ferrier glycosylation of sulfonamides and amino acids with various N-nucleophiles. The stereoselective synthesis of 2,3-unsaturated-N-pseudoglycals was carried out with 3,4,6-tri-O-acetyl-d-glucal and different nucleophiles affording good results in a short time. (C) 2017 Published by Elsevier Ltd.