2′-binaphthol phosphorochloridite have been prepared and tested in asymmetric palladium-catalyzed allylic alkylations. The enantioselectivity was poorly dependent on the pyridine substituent, instead, a chelateringsize effect was apparent.
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