[EN] PROCESS AND INTERMEDIATE FOR THE PRODUCTION OF A TERTIARY ALCOHOL AS AN INTERMEDIATE IN THE SYNTHESIS OF MONTELUKAST<br/>[FR] PROCÉDÉ ET INTERMÉDIAIRE DE FABRICATION D'UN ALCOOL TERTIAIRE COMME INTERMÉDIAIRE DANS LA SYNTHÈSE DU MONTÉLUKAST
申请人:LONZA AG
公开号:WO2009010230A2
公开(公告)日:2009-01-22
The tertiary alcohol α-[3-[(1E)-2-(7-chloro-2-quinolinyl)ethenyl]phenyl]-2-(1-hydroxy- 1-methylethyl)benzenepropanol, the (αS)-enantioner of which is an intermediate in the production of montelukast, is produced by reacting the novel lactone of formula (II) with a methylmagnesium halide in an ethereal solvent in the presence of lanthanum trichloride and lithium chloride. The lactone II can be prepared by reacting a corresponding hydroxyester with a Grignard reagent in the absence of a lanthanoid compound or with a strong base.