PROCÉDÉ DE PRÉPARATION DE 5-(2-{[6-(2,2-DIFLUORO-2-PHÉNYLÉTHOXY)HEXYL]AMINO}-1(R)-HYDROXYÉTHYL)-8-HYDROXYQUINOLINE-2(1H)-ONE VIA UN NOUVEL INTERMÉDIAIRE
The present invention is concerned with a compound of formula (Ap) or a pharmaceutically acceptable salt thereof, wherein P 1 represents a hydroxy protecting group and P 3 represents an amino protecting group. The present invention is also related to a process for preparing a compound of formula (I) or any pharmaceutically acceptable salt thereof, via a novel intermediate compound (Ap).La présente invention concerne un procédé de préparation d'un composé 5-(2-{[6-(2,2-difluoro-2-phényléthoxy)hexyl]amino}-1(R)-hydroxyéthyl)-8-hydroxyquinoline-2(1 H)-one de formule (I) ou son sel pharmaceutiquement acceptable.