反应详情

A solution of 0.1 mol of 5-heptyloxy-2-(4-(2-hydroxy-5-oxaoctyloxy)-2-fluorophenyl)pyridine (prepared by heating optically active 1,2-epoxy-5-oxaoctane, obtainable from malic acid, with 5-heptyloxy-2-(4-hydroxy-2-fluorophenyl)pyridine in the presence of dry potassium carbonate and methyl ethyl ketone as solvent) in methylene chloride is cooled to -40° C. and 0.11 mol of DAST is added to it dropwise with moisture being excluded. The reaction mixture is then stirred for 12 hours while heating slowly to room temperature. Then hydrolysis is carried out with ice cooling and the reaction mixture is washed with dilute sodium hydroxide solution and several times with water. After drying over magnesium sulfate, the solvent is removed on a rotary evaporator and the crude product is purified chromatographically and - by crystallization. Optically active 5-heptyloxy-2-(4-(2-fluoro-5-oxaoctyloxy)-2-fluorophenyl)pyridine is obtained.

1. customThen hydrolysis
2. washthe reaction mixture is washed with dilute sodium hydroxide solution and several times with water
3. dry with materialAfter drying over magnesium sulfate
4. customthe solvent is removed on a rotary evaporator
5. customthe crude product is purified chromatographically and - by crystallization