Novel Approach to 5-Substituted Proline Derivatives Using a Silver-Catalyzed Cyclization as the Key Step
摘要:
[GRAPHICS]A novel synthetic approach to the synthesis of enantiomerically pure 2,5-disubstituted pyrrolines is described. The methodology involves a Ag-catalyzed 5-endo-dig cyclization of enantiopure aryl-substituted acetylene-containing amino acids. It has also been shown that the obtained pyrrolines can be efficiently transformed into the corresponding saturated 5-aryl-substituted proline derivatives.
Expedient Synthesis of Triazole-Linked Glycosyl Amino Acids and Peptides
作者:Brian H. M. Kuijpers、Stan Groothuys、A. (Bram) R. Keereweer、Peter J. L. M. Quaedflieg、Richard H. Blaauw、Floris L. van Delft、Floris P. J. T. Rutjes
DOI:10.1021/ol048841o
日期:2004.9.1
[structure: see text] An expedient, high-yieldingsynthesis of two types of triazole-linked glycopeptides is described. These novel and stable glycopeptide mimics were prepared via Cu(I)-catalyzed [3 + 2] cycloaddition of either azide-functionalized glycosides and acetylenic amino acids or acetylenic glycosides and azide-containing amino acids.
Palladium-Catalyzed Synthesis of Novel Optically Active Tryptophan Analogues
作者:Bart C. J. van Esseveldt、Floris L. van Delft、René de Gelder、Floris P. J. T. Rutjes
DOI:10.1021/ol034360d
日期:2003.5.1
[reaction: see text] Both unsaturated proline derivatives and opticallyactivetryptophan analogues have been obtained via Pd-catalyzed cyclization of aniline-containing acetylenic amino acids. The side chain length of the cyclization precursor determines which one of the two possible products will be formed.