piperazine;hydrochloride

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

Procedure: To a solution of (R,S)2-(1-pyrrolidinyl)methyl]piperazine hydrochloride (1.0 g, 3.58 mmol) and Et3N (0.5 mL, 3.58 mmol) in 10 mL of CH2Cl2 was added trifluoroacetic anhydride (0.5 mL, 3.58 mmol) at 0° C. The reaction mixture is stirred at 0° C. for 5 h. The reaction mixture was evaporated under reduced pressure (due to the water solubility of this compound there was no aqueous work-up) and isolated on a silica gel column (solvent system: CH2Cl2: CH3OH: 28% NH4OH (98:2:2) to give the desired product as a free base (0.18 g, 20%); 1H NMR (free base 200 MHz, CDCl3) d 1.76 (m,4H), 2.25-3.15 (m, 10H), 3.26 (t, 2H), 3.88 (m, 1H), 4.39 (t, 1H). The reaction mixture was evaporated under reduced pressure (due to the water solubility of this compound there isolated on a silica gel column (solvent system

Conditions: temp:110.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 905.3 g (10.5 mol) of piperazine and 945 ml of xylene (anhydrous) as solvent are charged to a 4 liter 4-neck flask and subsequently innertized with nitrogen. The batch is heated to a temperature of 100° C., in the course of which the piperazine dissolves completely. Added dropwise at this temperature are 446.3 g (2.1 mol) of chloromethyltriethoxysilane, over the course of 1 h with thorough stirring. Following the addition of about ⅓ of the amount of silane, piperazine hydrochloride is precipitated as a salt, but the suspension remains readily stirrable until the end of the reaction. After the end of the addition, stirring is continued for a further 15 min. Subsequently the reaction mixture is heated to 110° C. and the precipitated salt is filtered off on a preheated filter. dissolves completely Added dropwise at this temperature over the course of 1 h is precipitated as a salt the suspension remains readily stirrable until the end of the reaction After the end of the addition the precipitated salt is filtered off on a preheated filter

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

Procedure: To a solution of (R,S)2-(1-pyrrolidinyl)methyl]piperazine hydrochloride (1.0 g, 3.58 mmol) and Et3N (0.5 mL, 3.58 mmol) in 10 mL of CH2Cl2 was added trifluoroacetic anhydride (0.5 mL, 3.58 mmol) at 0° C. The reaction mixture is stirred at 0° C. for 5 h. The reaction mixture was evaporated under reduced pressure (due to the water solubility of this compound there was no aqueous work-up) and isolated on a silica gel column (solvent system: CH2Cl2: CH3OH: 28% NH4OH (98:2:2) to give the desired product as a free base (0.18 g, 20%); 1H NMR (free base 200 MHz, CDCl3) d 1.76 (m,4H), 2.25-3.15 (m, 10H), 3.26 (t, 2H), 3.88 (m, 1H), 4.39 (t, 1H). The reaction mixture was evaporated under reduced pressure (due to the water solubility of this compound there isolated on a silica gel column (solvent system

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

Procedure: To a solution of (R,S)2-(1-pyrrolidinyl)methyl]piperazine hydrochloride (1.0 g, 3.58 mmol) and Et3N (0.5 mL, 3.58 mmol) in 10 mL of CH2Cl2 was added trifluoroacetic anhydride (0.5 mL, 3.58 mmol) at 0° C. The reaction mixture is stirred at 0° C. for 5 h. The reaction mixture was evaporated under reduced pressure (due to the water solubility of this compound there was no aqueous work-up) and isolated on a silica gel column (solvent system: CH2Cl2: CH3OH: 28% NH4OH (98:2:2) to give the desired product as a free base (0.18 g, 20%); 1H NMR (free base 200 MHz, CDCl3) d 1.76 (m,4H), 2.25-3.15 (m, 10H), 3.26 (t, 2H), 3.88 (m, 1H), 4.39 (t, 1H). The reaction mixture was evaporated under reduced pressure (due to the water solubility of this compound there isolated on a silica gel column (solvent system

Conditions: temp:110.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 905.3 g (10.5 mol) of piperazine and 945 ml of xylene (anhydrous) as solvent are charged to a 4 liter 4-neck flask and subsequently innertized with nitrogen. The batch is heated to a temperature of 100° C., in the course of which the piperazine dissolves completely. Added dropwise at this temperature are 446.3 g (2.1 mol) of chloromethyltriethoxysilane, over the course of 1 h with thorough stirring. Following the addition of about ⅓ of the amount of silane, piperazine hydrochloride is precipitated as a salt, but the suspension remains readily stirrable until the end of the reaction. After the end of the addition, stirring is continued for a further 15 min. Subsequently the reaction mixture is heated to 110° C. and the precipitated salt is filtered off on a preheated filter. dissolves completely Added dropwise at this temperature over the course of 1 h is precipitated as a salt the suspension remains readily stirrable until the end of the reaction After the end of the addition the precipitated salt is filtered off on a preheated filter

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

Procedure: To a solution of (R,S)2-(1-pyrrolidinyl)methyl]piperazine hydrochloride (1.0 g, 3.58 mmol) and Et3N (0.5 mL, 3.58 mmol) in 10 mL of CH2Cl2 was added trifluoroacetic anhydride (0.5 mL, 3.58 mmol) at 0° C. The reaction mixture is stirred at 0° C. for 5 h. The reaction mixture was evaporated under reduced pressure (due to the water solubility of this compound there was no aqueous work-up) and isolated on a silica gel column (solvent system: CH2Cl2: CH3OH: 28% NH4OH (98:2:2) to give the desired product as a free base (0.18 g, 20%); 1H NMR (free base 200 MHz, CDCl3) d 1.76 (m,4H), 2.25-3.15 (m, 10H), 3.26 (t, 2H), 3.88 (m, 1H), 4.39 (t, 1H). The reaction mixture was evaporated under reduced pressure (due to the water solubility of this compound there isolated on a silica gel column (solvent system