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.
Transition Metal-Catalyzed Synthesis of Novel Biologically Relevant Tryptophan Analogues
作者:Bart C. J. van Esseveldt、Floris L. van Delft、Jan M. M. Smits、René de Gelder、Hans E. Schoemaker、Floris P. J. T. Rutjes
DOI:10.1002/adsc.200404012
日期:2004.6
synthetic approach to the synthesis of noveltryptophan derivatives and benzofuran-containing amino acids is detailed. The sequence starts from enzymatically resolved enantiopure acetylene-containing amino acids, of which the acetylene function can be efficiently transformed into the targeted 2-substited indole and benzofuran moieties via Sonogashira-type coupling and metal-catalyzed cyclization.