摘要:
The tertiary alcohol α-[3-[(1E)-2-(7-chloro-2-quinolinyl)ethenyl]phenyl]-2-(1-hydroxy-1-methylethyl)benzene-propanol, 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.
摘要:
Tertiary alcohols are prepared by reacting carboxylic esters with Grignard reagents in ethereal solvents in the presence of lanthanum trichloride and lithium chloride. The method is particularly suitable for the production of (αS)-α-[3-[(1E)-2-(7-chloro-2-quino-linyl)ethenyl]phenyl]-2-(1-hydroxy-1-methylethyl)benzenepropanol of formula (A) which is an intermediate in the production of montelukast.
摘要:
A process for the preparation of 1-(pyrimidin-2-yl)propan-2-ones of general formula (I), in which R is in each case a C1-10-alkyl group, a C3-8-cycloalkyl group, an alkyl group or an aryl-C1-4-alkyl group. For this, a malondiimidate of the general formula (II), in which R has the meaning given above, is reacted with diketene. The compounds which can be prepared according to the invention are intermediates for the synthesis of agrochemical active ingredients.