Catalysis with Phosphine-Containing Amino Acids in Various “Turn” Motifs
作者:Anton Agarkov、Scott J. Greenfield、Takahiro Ohishi、Scott E. Collibee、Scott R. Gilbertson
DOI:10.1021/jo049103g
日期:2004.11.1
We have been actively involved in the development of parallel approaches for the discovery of phosphine ligands. Our approach has been based on the incorporation of phosphine-containing amino acids into peptide sequences that are designed to have stable secondary structures. We have examined helical and turn secondary structures and have reported that alkylation of cyclopentenyl acetate with dimethylmalonate can be catalyzed in high enantiomeric excess (ee) with a beta-turn-based ligand. The importance of the peptide secondary structure was demonstrated through the synthesis of a series of peptide ligands where the nature of the turn-forming residues was probed. Additionally, other turn-forming units and a variety of different phosphine-containing amino acids have been examined for their ability to control the selectivity of the allylation reaction. This paper reports the results obtained through the examination of different turn motifs as well as different phosphine substitutions on the "best" turn sequence, Pps-Pro-D-Xxx-Pps.
High Asymmetric Induction with β-Turn-Derived Palladium Phosphine Complexes
作者:Scott J. Greenfield、Anton Agarkov、Scott R. Gilbertson
DOI:10.1021/ol035097j
日期:2003.8.1
[reaction: see text] Work toward the development of a bisphosphine ligand system for the palladium-catalyzed addition to cyclic allyl acetates is reported. A parallel approach using phosphine-containing amino acids in conjunction with natural amino acids was used to develop a selective ligand system. The ligand system was examined while attached to the polymer support as well as in solution. Selectivites