(1,4-dibenzylpiperazin-2-yl)methanol

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: To a solution of 1,4-dibenzyl-2-(hydroxymethyl)piperazine (1.51 g), phthalimide (0.790 g) and triphenylphosphine (1.40 g) in tetrahydrofuran (20 ml) was added a 40% toluene solution (2.34 ml) of diethyl azodicarboxylate under ice cooling. The resulting mixture was stirred at room temperature for 6 hours. Furthermore, 1,4-dibenzyl-2-(hydroxymethyl)piperazine (0.87 g), phthalimide (0.486 g), triphenylphosphine (0.81 g) and tetrahydrofuran (5 ml) were added to the reaction mixture, followed by the addition of a 40% toluene solution (1.34 ml) of diethyl azodicarboxylate under ice cooling. The resulting mixture was stirred at room temperature for 18.5 hours. Phthalimide (0.405 g) and a 40% toluene solution (1.10 ml) of diethyl azodicarboxylate were added under ice cooling, followed by stirring at room temperature for 20 hours. The solvent was distilled off under reduced pressure. The residue was subjected to column chromatography twice (3% methanol—methylene chloride for the first time and ethyl acetate/hexane=1/3 for the second time) using as a carrier silica gel, whereby a crude product was obtained. The crude product was crystallized from hexane - methylene chloride, collected by filtration and washed with hexane, whereby the title compound (0.243 g) was obtained as colorless powder. The resulting mixture was stirred at room temperature for 18.5 hours by stirring at room temperature for 20 hours The solvent was distilled off under reduced pressure was obtained The crude product was crystallized from hexane - methylene chloride collected by filtration washed with hexane, whereby the title compound (0.243 g) was obtained as colorless powder

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

Procedure: In N,N-dimethylformamide (20 ml) were dissolved 1,4-dibenzyl-2-hydroxymethylpiperazine (1.11 g) and imidazole (347 mg). Under ice cooling, tert-butylchlorodiphenylsilane (1.17 ml, 1.24 g) was added to the reaction mixture, followed by stirring at room temperature for 14.5 hours. The solvent was distilled off under reduced pressure. The residue was extracted with ethyl acetate and a saturated aqueous solution of sodium bicarbonate. The organic layer was then washed with saturated aqueous NaCl solution, dried over anhydrous sodium sulfate and distilled under reduced pressure to remove the solvent. The residue was subjected to column chromatography (hexane:ethyl acetate=9:1→8:2) using as a carrier silica gel, whereby the title compound (1.42 g) was obtained. The solvent was distilled off under reduced pressure The residue was extracted with ethyl acetate The organic layer was then washed with saturated aqueous NaCl solution dried over anhydrous sodium sulfate distilled under reduced pressure to remove the solvent was obtained

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

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

Procedure: A 6 g portion of 1,4-bis(phenylmethyl)-2-piperazinemethanol was dissolved in 90 ml of dichloromethane together with 4.26 ml of triethylamine and then cooled to 0°-5° C. A 2.04 ml portion of methanesulfonyl chloride was added and the mixture was allowed to warm to room temperature over 2 hours. The mixture was washed with ice cold sodium bicarbonate solution, followed twice with ice water, dried, filtered and evaporated. The residue was dissolved in dimethylformamide and added to a solution of 2.07 g of sodium phenol and 1.02 g of 50% sodium hydride in 30 ml of dimethylformamide under argon. This mixture was stirred for 48 hours, water was added and the mixture extracted twice with ether. The extracts were combined, washed with water, dried, filtered and evaporated, giving a gum which was crystallized from methanol with refrigeration, giving 4.1 g of 3-phenoxymethyl-1,4-bis(phenylmethyl)piperazine. cooled to 0°-5° C The mixture was washed with ice cold sodium bicarbonate solution dried filtered evaporated The residue was dissolved in dimethylformamide added to a solution of 2.07 g of sodium phenol and 1.02 g of 50% sodium hydride in 30 ml of dimethylformamide under argon water was added the mixture extracted twice with ether washed with water dried filtered evaporated giving a gum which was crystallized from methanol with refrigeration

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

Procedure: A 6 g portion of 1,4-bis(phenylmethyl)-2-piperazinemethanol was dissolved in 90 ml of dichloromethane together with 4.26 ml of triethylamine and then cooled to 0°-5° C. A 2.04 ml portion of methanesulfonyl chloride was added and the mixture was allowed to warm to room temperature over 2 hours. The mixture was washed with ice cold sodium bicarbonate solution, followed twice with ice water, dried, filtered and evaporated. The residue was dissolved in dimethylformamide and added to a solution of 2.07 g of sodium phenol and 1.02 g of 50% sodium hydride in 30 ml of dimethylformamide under argon. This mixture was stirred for 48 hours, water was added and the mixture extracted twice with ether. The extracts were combined, washed with water, dried, filtered and evaporated, giving a gum which was crystallized from methanol with refrigeration, giving 4.1 g of 3-phenoxymethyl-1,4-bis(phenylmethyl)piperazine. cooled to 0°-5° C The mixture was washed with ice cold sodium bicarbonate solution dried filtered evaporated The residue was dissolved in dimethylformamide added to a solution of 2.07 g of sodium phenol and 1.02 g of 50% sodium hydride in 30 ml of dimethylformamide under argon water was added the mixture extracted twice with ether washed with water dried filtered evaporated giving a gum which was crystallized from methanol with refrigeration

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

Procedure: To a solution of 10.1 ml of thionyl chloride in 50 ml of carbon tetrachloride was added, with stirring, a solution of 22.15 g of 1,4-bis(phenylmethyl)-2-piperazinemethanol in 120 ml of carbon tetrachloride. This mixture was stirred in an oil bath at 70° C. for one hour, then cooled in an ice bath and a solution of 17.1 9 of potassium hydroxide in 50 ml of water was added. The mixture was extracted several times with dichloromethane. The extracts were combined, filtered through hydrous magnesium silicate and evaporated. The residual gum was dissolved in warm heptane, filtered and evaporated to an oil which crystallized on standing, giving 17.94 g of 2-chloromethyl-1,4-bis(phenylmethyl)piperazine, mp 54°-56° oC. This mixture was stirred in an oil bath at 70° C. for one hour cooled in an ice bath The mixture was extracted several times with dichloromethane filtered through hydrous magnesium silicate evaporated The residual gum was dissolved in warm heptane filtered evaporated to an oil which crystallized