methyl 3-(4-hydroxyphenyl)prop-2-enoate

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a solution 5 g (28.1 mmol) of 4-Hydroxycinnamic acid methyl ester, 4.9 g (35.1 mmol) of 4 bromopropanol, 9.2 g (35.1 mmol) of triphenylphosphine in 100 mL of THF are added 7.1 g (35.1 mmol) of diisopropylazodicarboxylate under inert atmosphere. The solution is heated up to reflux and allowed to stir overnight. After 20 hours, the reaction mixture is partitioned between EtOAc and water. The organic phase is washed repeatedly with water, dried over sodium sulphate, filtered and concentrated by rotary evaporation to give 7.5 g of (methyl (2E)-3-[4-(3-bromopropoxy)phenyl]prop-2-enoate. The solution is heated up to reflux After 20 hours the reaction mixture is partitioned between EtOAc and water The organic phase is washed repeatedly with water dried over sodium sulphate filtered concentrated by rotary evaporation

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a solution 5 g (28.1 mmol) of 4-Hydroxycinnamic acid methyl ester, 4.9 g (35.1 mmol) of 4 bromopropanol, 9.2 g (35.1 mmol) of triphenylphosphine in 100 mL of THF are added 7.1 g (35.1 mmol) of diisopropylazodicarboxylate under inert atmosphere. The solution is heated up to reflux and allowed to stir overnight. After 20 hours, the reaction mixture is partitioned between EtOAc and water. The organic phase is washed repeatedly with water, dried over sodium sulphate, filtered and concentrated by rotary evaporation to give 7.5 g of (methyl (2E)-3-[4-(3-bromopropoxy)phenyl]prop-2-enoate. The solution is heated up to reflux After 20 hours the reaction mixture is partitioned between EtOAc and water The organic phase is washed repeatedly with water dried over sodium sulphate filtered concentrated by rotary evaporation

反応条件: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: 15 g (84.2 mmol) of 4-hydroxycinnamic acid methyl ester, 14 g (101 mmol) of 3-bromo-1-propanol, 23.4 g of K2CO3 are dissolved in 90 mL of NMP. The solution is heated up to 80° C. and stirred for 20 hours. Then, the reaction mixture is cooled down to room temperature and carefully acidified with 1N HCl solution. The solution is extracted with ethylacetate. The organic phase is dried over sodium sulfate, filtrated and concentrated under reduced pressure. Chromatography of the residue on silica gel using hexane:ethyl acetate 7:3 as eluent yielded 5.8 g of methyl (2E)-3-[4-(3-hydroxypropoxy)phenyl]prop-2-enoate as a white solid. Then, the reaction mixture is cooled down to room temperature The solution is extracted with ethylacetate The organic phase is dried over sodium sulfate filtrated concentrated under reduced pressure

反応条件: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: 15 g (84.2 mmol) of 4-hydroxycinnamic acid methyl ester, 14 g (101 mmol) of 3-bromo-1-propanol, 23.4 g of K2CO3 are dissolved in 90 mL of NMP. The solution is heated up to 80° C. and stirred for 20 hours. Then, the reaction mixture is cooled down to room temperature and carefully acidified with 1N HCl solution. The solution is extracted with ethylacetate. The organic phase is dried over sodium sulfate, filtrated and concentrated under reduced pressure. Chromatography of the residue on silica gel using hexane:ethyl acetate 7:3 as eluent yielded 5.8 g of methyl (2E)-3-[4-(3-hydroxypropoxy)phenyl]prop-2-enoate as a white solid. Then, the reaction mixture is cooled down to room temperature The solution is extracted with ethylacetate The organic phase is dried over sodium sulfate filtrated concentrated under reduced pressure

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: Thionyl chloride (1.33 mL) is added dropwise to methanol (30 mL) under ice-cooling and the solution is stirred for 10 minutes. To the solution is added 4-hydroxycinnamic acid (3.0 g) and the mixture is stirred at room temperature for 4 days. The reaction mixture is concentrated and the residue is diluted with ethyl acetate (50 mL), washed successively with a saturated sodium hydrogencarbonate solution and saturated brine, dried over anhydrous sodium sulfate, and concentrated in vacuo. The residue is re-crystallized from ethyl acetate/n-hexane to methyl 4-hydroxycinnamate (2.86 g, yield; 88%) as pale yellow crystals. cooling the mixture is stirred at room temperature for 4 days The reaction mixture is concentrated the residue is diluted with ethyl acetate (50 mL) washed successively with a saturated sodium hydrogencarbonate solution and saturated brine dried over anhydrous sodium sulfate concentrated in vacuo