Stereoselective Total Synthesis of Aminoiminohexitols via Carbamate Annulation
作者:Anna L. Win-Mason、Seino A. K. Jongkees、Stephen G. Withers、Peter C. Tyler、Mattie S. M. Timmer、Bridget L. Stocker
DOI:10.1021/jo201151b
日期:2011.12.2
New methodology for the preparation of a variety of aminoiminohextitols is described. Key in the synthesis is the application of a diastereoselective Strecker reaction and the extension of our carbamateannulationmethodology to protected and functionalized alkenylamines. Insight into the effects that the substitution patterns of the alkenylamines have on the diastereoselectivity of the iodocyclization
Protecting-Group-Free Synthesis of Amines: Synthesis of Primary Amines from Aldehydes via Reductive Amination
作者:Emma M. Dangerfield、Catherine H. Plunkett、Anna L. Win-Mason、Bridget L. Stocker、Mattie S. M. Timmer
DOI:10.1021/jo100004c
日期:2010.8.20
New methodology for the protecting-group-free synthesis of primary amines is presented. By optimizing the metal hydride/ammonia mediated reductive amination of aldehydes and hemiacetals, primary amines were selectively prepared with no or minimal formation of the usual secondary and tertiary amine byproduct. The methodology was performed on a range of functionalized aldehyde substrates, including in
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.