Novel, Efficient Alkene-Phosphinite Hybrid Ligand Based on <scp>d</scp>-Glucose
作者:Tobias Minuth、Mike M. K. Boysen
DOI:10.1021/ol901579g
日期:2009.9.17
A commercially available 2,3-unsaturated pyranoside, derived from d-glucose, was converted into a new type of olefin phosphorus chelate ligand in only three steps. Application in rhodium catalyzed conjugate additions of phenylboronic acid to enones led to excellent levels of stereoinduction for several cyclic substrates. The easy preparation and the high efficiency of this ligand make it an interesting
Novel Olefin-Phosphorus Hybrid and Diene Ligands Derived from Carbohydrates
作者:Mike Boysen、Holger Grugel、Tobias Minuth
DOI:10.1055/s-0030-1258190
日期:2010.10
olefin-phosphinite hybrid ligands has been designed. These ligands were prepared by attaching phosphinite or allylic donor sites onto unsaturated carbohydrate scaffolds. In rhodium(I)-catalysed conjugate addition of boronic acids to enones, the olefin-phosphinite hybrids gave products in up to 99% ee and above, whereas the dienes only led to modest enantioselectivity. However, by shifting the allylic donor