4-propan-2-yloxybenzaldehyde

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1.04 g (6.09 mmol) of 4-methylsulfonylaniline (obtained in reference example 1), 1.00 mL (6.09 mmol) of 4-isopropoxybenzaldehyde (obtained in reference example 3) and 25 mL of toluene was heated at reflux in a Dean-Stark for 2 days. The solvent was removed and the crude product obtained was directly used in the next reaction. was heated at reflux in a Dean-Stark for 2 days The solvent was removed

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2 g (16.38 mmol) of 4-hydroxybenzaldehyde in 100 mL of DMF, 2.72 g (19.69 mmol) of K2CO3, 2.74 g (16.52 mmol) of KI and 3.94 mL (39.38 mmol) of 2-iodopropane was added under argon. The mixture was stirred at 80° C. overnight, concentrated and the residue obtained was partitioned between CHCl3 and H2O. The phases were separated, the aqueous phase was extracted with CHCl3 and the combined organic phases were dried over MgSO4 and concentrated. The crude product obtained was purified by chromatography on silica gel using EtOAc/hexane mixtures of increasing polarity as eluent, to give 2.08 g of the title compound of the example as an oil (77% yield). concentrated the residue obtained was partitioned between CHCl3 and H2O The phases were separated the aqueous phase was extracted with CHCl3 the combined organic phases were dried over MgSO4 concentrated The crude product obtained was purified by chromatography on silica gel of increasing polarity as eluent

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A suspension of 140 g of methoxymethyl-triphenylphosphonium chloride in 400 ml of tert.-butyl methyl ether is treated with 45 g of potassium tert.-butylate within 5 minutes at 0° C. while gassing with nitrogen and the mixture is stirred for a further 10 minutes. Then, a solution of 41 g of 4-(isopropyloxy)-benzaldehyde in 100 ml of tert.-butyl methyl ether is added dropwise at 0° C. within 30 minutes. The reaction mixture is stirred at room temperature for a further 16 hours and then poured into 750 ml of 0.8N sodium hydrogen carbonate solution. The aqueous phase is separated and back-extracted with diethyl ether. The organic phase is washed neutral with water, dried over magnesium sulphate and concentrated. The residue is suspended in 800 ml of hexane. After cooling to 0° C. the triphenylphosphine oxide is filtered off and the filtrate is concentrated. Chromatography of the residue on silica gel with hexane/ethyl acetate (vol. 9:1) gives 45 g of pure 1-methoxy-2-(4-[isopropoxy]phenyl)ethene. The reaction mixture is stirred at room temperature for a further 16 hours The aqueous phase is separated back-extracted with diethyl ether The organic phase is washed neutral with water dried over magnesium sulphate concentrated is filtered off the filtrate is concentrated