2-N-PROPYLPROPANE-1,3-DIOL

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 solution of 1.51 g of 6-(4-fluorophenyl)-3-pyridinecarboxaldehyde and 1.10 g of 2-propyl-1,3-propanediol in 50 ml of toluene was treated with 10 drops of 10 percent (v/v) sulphuric acid. The mixture was heated to boiling for 1.5 hours, whereby moist toluene was distilled off and replaced by fresh toluene. Then, the reaction mixture was neutralized with triethylamine and, after cooling, washed three times with water, dried over sodium sulphate and concentrated. Chromatographic purification of the residue on 60 g of silica gel with toluene/acetone (vol. 99:1) and two-fold recrystallization of the trans/cis mixture from hexane/ethyl acetate (vol. 1:1) gave 0.51 g of pure 5-(trans-5-propyl-1,3-dioxan-2-yl)-2-(4-fluorophenyl)pyridine; m.p. (C-SA) 106.5° C., SA -N 117.5° C., cl.p. (N-I) 163° C. The mixture was heated whereby moist toluene was distilled off after cooling washed three times with water dried over sodium sulphate concentrated Chromatographic purification of the residue on 60 g of silica gel with toluene/acetone (vol. 99:1) and two-fold recrystallization of the trans/cis mixture from hexane/ethyl acetate (vol. 1:1)

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

Procedure: 2-Propyl-1,3-propanediol (138.0 g; 1.17 mol) and 3-fluorobenzaldehyde (138.0 g; 1.11 mol) were dissolved in toluene (1.5 liters), and PTS (7 g) was added. The mixture was refluxed for 3 hours while being dehydrated with a Dean-Stark's device. The resultant reaction mixture was washed sequentially with saturated sodium bicarbonate solution and saturated brine, and then dried over magnesium sulfate. Subsequently, the solvent was evaporated. The residue was recrystallized twice from heptane, to thereby obtain 81.2 g (362 mmol) of 5-propyl-2-(3-fluorophenyl)-1,3-dioxane. The yield of the compound from 3-fluorobenzaldehyde was 32.6%. PTS (7 g) was added The mixture was refluxed for 3 hours The resultant reaction mixture was washed sequentially with saturated sodium bicarbonate solution and saturated brine dried over magnesium sulfate Subsequently, the solvent was evaporated The residue was recrystallized twice from heptane

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

Procedure: 2-Propyl-1,3-propanediol (83.2 g; 704 mmol) and 3,5-difluorobenzaldehyde (100 g; 704 mmol) were dissolved in toluene (1 liter), and p-toluenesulfonic acid (hereinafter referred to as PTS; 5 g) was added. The mixture was refluxed for 3 hours while being dehydrated with a Dean-Stark's device. The resultant reaction mixture was washed sequentially with saturated sodium bicarbonate solution and saturated brine and dried over magnesium sulfate. Subsequently, the solvent was evaporated. The residue was recrystallized twice from heptane, to thereby obtain 82.0 g (338 mmol) of 5-propyl-2-(3,5-difluorophenyl)-1,3-dioxane. The yield of the compound from 3,5-difluorobenzaldehyde was 48.0%. 5 g) was added The mixture was refluxed for 3 hours The resultant reaction mixture was washed sequentially with saturated sodium bicarbonate solution and saturated brine dried over magnesium sulfate Subsequently, the solvent was evaporated The residue was recrystallized twice from heptane

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 1.2 g. 2-propylpropan-1,3-diol, 2.2 g. trans-5-formyl-2-p-methoxyphenyl-1,4-dioxane (obtainable by reaction of 1,1-ethylenedioxypropan-2,3-diol with p-methoxystyrene oxide and hydrolysis), 0.01 g. p-toluene sulphonic acid and 15 ml. toluene is boiled on a water separator for 3 hours, cooled, washed with water and evaporated. One obtains trans-2-p-methoxyphenyl-5-(trans-5-propyl-1,3-dioxan-2-yl)-1,4-dioxane. A mixture of 1.2 g cooled washed with water evaporated

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

Procedure: A mixture of 1.2 g. 2-propylpropan-1,3-diol, 2.2 g. trans-5-formyl-2-p-methoxyphenyl-1,4-dioxane (obtainable by reaction of 1,1-ethylenedioxypropan-2,3-diol with p-methoxystyrene oxide and hydrolysis), 0.01 g. p-toluene sulphonic acid and 15 ml. toluene is boiled on a water separator for 3 hours, cooled, washed with water and evaporated. One obtains trans-2-p-methoxyphenyl-5-(trans-5-propyl-1,3-dioxan-2-yl)-1,4-dioxane. A mixture of 1.2 g cooled washed with water evaporated

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

Procedure: A mixture of 1.2 g of 2-propylpropane-1,3-diol, 2.59 g of 5-(2-pentyl-5-pyridyl)-2-formyl-thiophene (obtainable by formylation of 5-(2-pentyl-5-pyridyl)-thiophene via a Vilsmeier reaction), 0.01 g of p-toluenesulfonic acid and 15 ml of toluene is boiled for 3 hours, using a water separator, cooled, washed with water and evaporated. 5-(2-Pentyl-5-pyridyl)-2-(trans-5-propyl-1,3-dioxan-2-yl)-thiophene is obtained. cooled washed with water evaporated

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

Procedure: A mixture of 1.2 g of 2-propylpropane-1,3-diol, 2.59 g of 5-(2-pentyl-5-pyridyl)-2-formyl-thiophene (obtainable by formylation of 5-(2-pentyl-5-pyridyl)-thiophene via a Vilsmeier reaction), 0.01 g of p-toluenesulfonic acid and 15 ml of toluene is boiled for 3 hours, using a water separator, cooled, washed with water and evaporated. 5-(2-Pentyl-5-pyridyl)-2-(trans-5-propyl-1,3-dioxan-2-yl)-thiophene is obtained. cooled washed with water evaporated