Synthesis and application in asymmetric C–C bond formation of solution phase ligand libraries of monodentate phosphoramidites
作者:Ate Duursma、Laurent Lefort、Jeroen A. F. Boogers、André H. M. de Vries、Johannes G. de Vries、Adriaan J. Minnaard、Ben L. Feringa
DOI:10.1039/b404996a
日期:——
A library of 96 unique monodentate phosphoramidite ligands has been synthesized in solution and used in the asymmetric conjugate addition of potassium vinyltrifluoroborate to enones resulting in up to 88% ee.
Rapid Identification of a Scalable Catalyst for the Asymmetric Hydrogenation of a Sterically Demanding Aryl Enamide
作者:Laurent Lefort、Jeroen A. F. Boogers、Thijs Kuilman、Robert Jan Vijn、John Janssen、Harrie Straatman、Johannes G. de Vries、André H. M. de Vries
DOI:10.1021/op100011y
日期:2010.5.21
High throughput screening was used to find a cost-effective and scalable catalyst for the asymmetrichydrogenation of a sterically demanding enamide as an intermediate towards a new potent melanocortin receptor agonist useful in the treatment of obesity. Lessons drawn from the testing of a first library of 96 chiral monodentate phosphoramidites led to the design of a second focused library of 16 chiral
Highly Enantioselective Conjugate Additions of Potassium Organotrifluoroborates to Enones by Use of Monodentate Phosphoramidite Ligands
作者:Ate Duursma、Jean-Guy Boiteau、Laurent Lefort、Jeroen A. F. Boogers、André H. M. de Vries、Johannes G. de Vries、Adriaan J. Minnaard、Ben L. Feringa
DOI:10.1021/jo0487810
日期:2004.11.1
rhodium-catalyzed asymmetric conjugate addition of potassium organotrifluoroborates to various enones in the absence of water is described. A systematic search for effective catalysts has been performed by use of high-throughput screening methods. Initially, we have screened reaction conditions, catalyst precursors, and focused ligand libraries. In the next stage we have used the monodentate ligand combination