Direct <i>N</i><i>-</i>Acetyl Enamine Formation: Lithium Bromide Mediated Addition of Methyllithium to Nitriles
作者:Cécile G. Savarin、Geneviève N. Boice、Jerry A. Murry、Edward Corley、Lisa DiMichele、Dave Hughes
DOI:10.1021/ol061318k
日期:2006.8.1
An improved protocol for N-acetyl enamineformation is disclosed which involves LiBr-mediated addition of MeLi to substituted nitriles. The resulting enamides are isolated in high yields and excellent purity which permits subsequent hydrogenation at very low catalyst loading.
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