تفاعل #595332

معادلة التفاعل

water

potassium carbonate

(S)-(−)-3-chloro-1,2-propanediol acetonide

4-hydroxybenzaldehyde

→

4-{[(4R)-2,2-Dimethyl-1,3-dioxolan-4-yl]methoxy}benzaldehyde

المذيبات

DMF

ظروف التفاعل

المعالجة

1. 1
   استخلاصthe mixture is extracted three times with in each case 500 ml of ethyl acetate
2. 2
   غسيلThe combined organic phases are washed in each case once with 500 ml water and 500 ml of sat. aqueous sodium chloride solution
3. 3
   تجفيفAfter drying over magnesium sulfate
4. 4
   أخرىthe solvent is removed on a rotary evaporator
5. 5
   أخرىthe residue is purified by column chromatography on silica gel 60 (mobile phase gradient: ethyl acetate/petroleum ether 1:9→2:8)

الإجراء التجريبي

31.2 g (255.4 mmol) of 4-hydroxybenzaldehyde are initially charged in 400 ml of dry DMF, and 105.7 g (766.1 mmol) of potassium carbonate and 50.0 g (332.0 mmol) of (S)-(−)-3-chloro-1,2-propanediol acetonide are added at RT. The mixture is stirred at 160° C. for 16 h. 4000 ml of water are then added, and the mixture is extracted three times with in each case 500 ml of ethyl acetate. The combined organic phases are washed in each case once with 500 ml water and 500 ml of sat. aqueous sodium chloride solution. After drying over magnesium sulfate, the solvent is removed on a rotary evaporator and the residue is purified by column chromatography on silica gel 60 (mobile phase gradient: ethyl acetate/petroleum ether 1:9→2:8).

المصدر