2-(2-bromoethyl)-4H-1,4-benzothiazin-3-one

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

Procedure: To a solution of 4.6 g of 2-aminothiophenol in 50 ml of dimethylformamide was added dropwise 9.55 g of methyl 2,4-dibromobutyrate with stirring at room temperature. After stirring one hour, the reaction mixture was poured into water to give crystals of 2-(2-bromoethyl)-2H-1,4-benzothiazin-3(4H)-one. The crystals were collected by filtration and washed with water, n-hexane and cold methanol. The yield was 6.32 g (63.3%). Recrystallization from ethyl acetate gave prisms, m.p. 151°-152° C. After stirring one hour

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

Procedure: In 20 ml of ethyl acetate were dissolved 1.36 g of 2-(2-bromoethyl)-2H-1,4-benzothiazin-3(4H)-one and 1.8 g of 1-(4-fluorophenyl)piperazine. The solvent was evaporated off, and the residue was stirred at 110° C. for one hour. The reaction product was extracted with ethyl acetate, and the extract was washed with water and dried over MgSO4. The crystals obtained by evaporation of the solvent were recrystallized from methanol to give 2-[2-[4-(4-fluorophenyl)-1-pyrazinyl]ethyl]-2H-1,4-benzothiazin-3(4H)-one as prisms, m.p. 158°-159° C. The yield was 0.94 g (50.5%). The solvent was evaporated off The reaction product was extracted with ethyl acetate the extract was washed with water dried over MgSO4 The crystals obtained by evaporation of the solvent were recrystallized from methanol

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

Procedure: To a solution of 4.6 g of 2-aminothiophenol in 50 ml of dimethylformamide was added dropwise 9.55 g of methyl 2,4-dibromobutyrate with stirring at room temperature. After stirring one hour, the reaction mixture was poured into water to give crystals of 2-(2-bromoethyl)-2H-1,4-benzothiazin-3(4H)-one. The crystals were collected by filtration and washed with water, n-hexane and cold methanol. The yield was 6.32 g (63.3%). Recrystallization from ethyl acetate gave prisms, m.p. 151°-152° C. After stirring one hour

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

Procedure: In 20 ml of ethyl acetate were dissolved 1.36 g of 2-(2-bromoethyl)-2H-1,4-benzothiazin-3(4H)-one and 1.8 g of 1-(4-fluorophenyl)piperazine. The solvent was evaporated off, and the residue was stirred at 110° C. for one hour. The reaction product was extracted with ethyl acetate, and the extract was washed with water and dried over MgSO4. The crystals obtained by evaporation of the solvent were recrystallized from methanol to give 2-[2-[4-(4-fluorophenyl)-1-pyrazinyl]ethyl]-2H-1,4-benzothiazin-3(4H)-one as prisms, m.p. 158°-159° C. The yield was 0.94 g (50.5%). The solvent was evaporated off The reaction product was extracted with ethyl acetate the extract was washed with water dried over MgSO4 The crystals obtained by evaporation of the solvent were recrystallized from methanol

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

Procedure: To a solution of 4.6 g of 2-aminothiophenol in 50 ml of dimethylformamide was added dropwise 9.55 g of methyl 2,4-dibromobutyrate with stirring at room temperature. After stirring one hour, the reaction mixture was poured into water to give crystals of 2-(2-bromoethyl)-2H-1,4-benzothiazin-3(4H)-one. The crystals were collected by filtration and washed with water, n-hexane and cold methanol. The yield was 6.32 g (63.3%). Recrystallization from ethyl acetate gave prisms, m.p. 151°-152° C. After stirring one hour

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

Procedure: In 20 ml of ethyl acetate were dissolved 1.36 g of 2-(2-bromoethyl)-2H-1,4-benzothiazin-3(4H)-one and 1.8 g of 1-(4-fluorophenyl)piperazine. The solvent was evaporated off, and the residue was stirred at 110° C. for one hour. The reaction product was extracted with ethyl acetate, and the extract was washed with water and dried over MgSO4. The crystals obtained by evaporation of the solvent were recrystallized from methanol to give 2-[2-[4-(4-fluorophenyl)-1-pyrazinyl]ethyl]-2H-1,4-benzothiazin-3(4H)-one as prisms, m.p. 158°-159° C. The yield was 0.94 g (50.5%). The solvent was evaporated off The reaction product was extracted with ethyl acetate the extract was washed with water dried over MgSO4 The crystals obtained by evaporation of the solvent were recrystallized from methanol