[EN] PROCESS FOR THE PREPARATION OF AN ENANTIOMERICALLY PURE TRISUBSTITUTED 1,2,3,4-TETRAHYDROISOQUINOLINE DERIVATIVE [FR] PROCÉDÉ POUR LA PRÉPARATION D'UN DÉRIVÉ TRISUBSTITUÉ ÉNANTIOMÉRIQUEMENT PUR DE LA 1,2,3,4-TÉTRAHYDROISOQUINOLINE
Catalytic Asymmetric Reduction of a 3,4-Dihydroisoquinoline for the Large-Scale Production of Almorexant: Hydrogenation or Transfer Hydrogenation?
作者:Gerard K. M. Verzijl、André H. M. de Vries、Johannes G. de Vries、Peter Kapitan、Thomas Dax、Matthias Helms、Zarghun Nazir、Wolfgang Skranc、Christoph Imboden、Juergen Stichler、Richard A. Ward、Stefan Abele、Laurent Lefort
DOI:10.1021/op400268f
日期:2013.12.20
presented for the enantioselective synthesis of the tetrahydroisoquinoline core of almorexant (ACT-078573A), a dual orexin receptor antagonist. Initial clinical supplies were secured by the Noyori Ru-catalyzed asymmetrictransferhydrogenation (Ru-Noyori ATH) of the dihydroisoquinoline precursor. Both the yield and enantioselectivity eroded upon scale-up. A broad screening exercise identified TaniaPhos