PuPHOS: A Synthetically Useful Chiral Bidentate Ligand for the Intermolecular Pauson−Khand Reaction
作者:Xavier Verdaguer、Agustí Lledó、Cristina López-Mosquera、Miguel Angel Maestro、Miquel A. Pericàs、Antoni Riera
DOI:10.1021/jo0486894
日期:2004.11.1
Here we describe the synthesis and use of the Pulegone-derived bidentate P,S ligands PuPHOS and CyPuPHOS in the intermolecular Pauson−Khandreaction. Ligand exchange reaction of hexacarbonyldicobalt−alkyne complexes with PuPHOS provides a diasteromeric mixture of complexes (up to 4.5:1) from which the major isomers can be conveniently separated by simple crystallization. An isomerization−crystallization