Glycomimetic Building Blocks: A Divergent Synthesis of Epimers of Shikimic Acid
作者:Joseph C. Grim、Kathleen C. A. Garber、Laura L. Kiessling
DOI:10.1021/ol201252x
日期:2011.8.5
A divergent synthesis of (−)-4-epi-shikimicacid was developed. This route features a one-pot zinc-mediated reductive ring opening of an arabinofuranose followed by a Barbier reaction and culminates in a ring-closing metathesis. Functionalization of (−)-4-epi-shikimicacid via conjugate addition of a thiol occurs in high diastereoselectivity to afford a product with the features of fucosylated glycans
[EN] METHODS FOR THE PREPARATION OF ALKENYLAMINES, CYCLIC CARBAMATES OR DITHIOCARBAMATES, AND AMINOALCOHOLS OR AMINOTHIOLS<br/>[FR] PROCÉDÉS POUR LA PRÉPARATION D'ALCÉNYLAMINES, DE CARBAMATES CYCLIQUES OU DE DITHIOCARBAMATES, ET D'AMINOALCOOLS OU D'AMINOTHIOLS
申请人:VICTORIA LINK LTD
公开号:WO2010041964A1
公开(公告)日:2010-04-15
A method for preparing an alkenylamine, or a salt, solvate or hydrate thereof, is disclosed. The method comprises reacting a alogen-substituted cyclic acetal or a derivative thereof under particular conditions to provide the alkenylamine, which may be optionally converted into a salt, solvate or hydrate thereof. A method for preparing a cyclic carbamate or cyclic dithiocarbamate, or a salt, solvate or hydrate thereof, is also disclosed. The method comprises reacting an alkenylamine under particular conditions to provide the cyclic carbamate or cyclic dithiocarbamate, which may be optionally converted into a salt, solvate or hydrate thereof. A method for preparing a 1,2-aminoalcohol or 1,2-aminothiol, or a salt, solvate or hydrate thereof, is also disclosed. The method comprises forming a cyclic carbamate or cyclic dithiocarbamate from an alkenylamine, and deprotecting the cyclic carbamate or cyclic dithiocarbamate to provide the 1,2-aminoalcohol or 1,2-aminothiol, which may optionally be converted into a salt, solvate or hydrate thereof.
Synthesis and anti-tuberculosis activity of glycitylamines
作者:Hilary M. Corkran、Emma M. Dangerfield、Gregory W. Haslett、Bridget L. Stocker、Mattie S.M. Timmer
DOI:10.1016/j.bmc.2015.12.036
日期:2016.2
A series of glycitylamines, which were prepared in few steps from readily available carbohydrates, were tested for their ability to inhibit tuberculosis growth in an Alamar Blue BCG colourimetric assay. Several derivatives, including (2R, 3R)-1-(hexadecylamine)pent-4-ene-2,3-diol, (2R, 3R)-1-(hexadecylmethylamino)pent-4-ene-2,3-diol and 5-deoxy-5-hexadecylmethylamino-D-arabinitol, were prepared in good to excellent (44-90%) overall yield and exhibited micromolar (20-41 mu M) inhibitory activity that was similar to the first line tuberculosis (TB) drug ethambutol (39 mu M) in the same assay. The ease and low cost of the synthesis of the glycitylamines offers definite advantages for their use as potential TB drugs. (c) 2016 Elsevier Ltd. All rights reserved.
Synthesis of difluorinated carbocyclic analogues of 5-deoxypentofuranoses and 1-amino-5-deoxypentofuranoses: en route to fluorinated carbanucleosides
作者:Gaëlle Fourrière、Nathalie Van Hijfte、Jérôme Lalot、Guy Dutech、Bruno Fragnet、Gaël Coadou、Jean-Charles Quirion、Eric Leclerc
DOI:10.1016/j.tet.2010.03.079
日期:2010.5
The synthesis of difluorinated carbocyclic analogues of 5-deoxypentofuranoses and 1-amino-5-deoxypentofuranoses is described. The sequence involves an addition of PhSeCF2TMS to carbohydrate-derived aldehydes or their corresponding tert-butanesulfinylimines followed by a radical cyclization. Optimized conditions for the PhSeCF2TMS addition to alpha-chiral aldehydes have been disclosed and its unusual diastereoselectivity is discussed. Application of the sequence using Ellman's auxiliary allows a more direct access to 1-aminopentose analogues with a complete control of the pseudo-anomeric center configuration. (C) 2010 Elsevier Ltd. All rights reserved.
A fast, efficient and stereoselective synthesis of hydroxy-pyrrolidines
作者:Emma M. Dangerfield、Shivali A. Gulab、Catherine H. Plunkett、Mattie S.M. Timmer、Bridget L. Stocker
DOI:10.1016/j.carres.2010.03.016
日期:2010.7
A five-step, protecting group free synthesis of 2,3-cis substituted hydroxy-pyrrolidines is presented. Key steps in the synthesis are the chemoselective formation of a primary amine via a Vasella reductive amination using ammonia as the nitrogen source, and the stereoselective formation of a cyclic carbamate from an alkenylamine. Improvement of the reductive amination, by way of the use of alpha-picoline borane as a more environmentally benign reducing agent, is also presented. (C) 2010 Elsevier Ltd. All rights reserved.