Synthesis of Methylene Exoglycals Using a Modified Julia Olefination
作者:David Gueyrard、Rose Haddoub、Amine Salem、Nassib Said Bacar、Peter G. Goekjian
DOI:10.1055/s-2005-862364
日期:——
A new route to exomethylene sugars is reported. The use of a two-step coupling-elimination procedure allows successful Juliaolefination of sugar-derivedlactones.
报道了外亚甲基糖的新途径。使用两步耦合消除程序可以成功实现糖衍生内酯的 Julia 烯化。
Synthesis of substituted exo-glucals via a modified Julia olefination and identification as selective β-glucosidase inhibitors
作者:Samuel Habib、Florent Larnaud、Emmanuel Pfund、Teresa Mena Barragán、Thierry Lequeux、Carmen Ortiz Mellet、Peter G. Goekjian、David Gueyrard
DOI:10.1039/c3ob41926f
日期:——
A series of fluorine and non-fluorine-substituted C-glucosylidenes (exo-glucals) has been synthesized via a modifiedJuliaolefination. The deprotected exo-glucals were prepared in five steps from commercially available D-gluconolactone. The evaluation of this original family of compounds against a panel of glycosidases showed a highly specific in vitro activity towards mammalian β-glucosidase depending
Carbohydrate-based spiro bis(isoxazolines): synthesis and evaluation in asymmetric catalysis
作者:David Goyard、Susanne M. Telligmann、Catherine Goux-Henry、Mike M.K. Boysen、Eric Framery、David Gueyrard、Sébastien Vidal
DOI:10.1016/j.tetlet.2009.11.028
日期:2010.1
Two carbohydrate-based spiro bis(isoxazolines) were synthesized via 1,3-dipolar cycloaddition from peracetylated methylene exo-glucal and the corresponding bis(arylnitrile oxide). The bis(cycloadducts) were then evaluated as ligands for enantioselective catalytic reactions. The Pd-catalyzed Tsuji-Trost reaction between a malonate and an allylic acetate did not provide good results. The poor conversion observed can be attributed to the rearrangement of the ligand in the reaction mixture to afford the corresponding ring-opened isoxazole which has been characterized. Both ligands were also evaluated in Cu(I)-catalyzed asymmetric imine alkynylation and afforded the product in good yield and modest enantioselectivity. (C) 2009 Elsevier Ltd. All rights reserved.
1-Methylene sugars as C-glycoside precursors
作者:T. V. RajanBabu、G. S. Reddy
DOI:10.1021/jo00376a088
日期:1986.12
Bessieres; Morin, Synlett, 2000, # 11, p. 1691 - 1693