ethyl 3-(2-bromophenyl)propanoate

Conditions: temp:-35.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a 2 L 4-necked round bottom flask that was equipped with an overhead stirrer, an addition funnel, a condenser and a temperature-probe, was added the solution of sodium ethoxide/ethanol (21% wt. %, 161.8 g) at 20–25° C. under nitrogen. Ethyl 2-benzylacetoacetate (103.1 g, 0.454 mole) was added dropwise. The resulting solution was stirred at 20–25° C. for 30 minutes. The reaction mixture was then cooled to −35° C. with a dry ice/acetone bath. N-Bromosuccinimide (NBS; 97.95 g, 0.545 mole) was added portion-wise over 30 minutes. After the addition was over, the reaction mixture was stirred at −35° C. for 1 hr before warming up to 20–25° C. and it was stirred for an additional 2 hrs. The reaction was then quenched with water (400 mL) and ethyl acetate (600 mL) was added. The layers were separated and the product was extracted from aqueous layer with ethyl acetate (400 mL×3). The combined organic layers was washed with saturated sodium bicarbonate twice (400 mL×2), water twice (400 mL×2) and brine (500 mL). After the removal of solvent, the product (crude, 132 g) was distilled under reduced pressure. Ethyl 2-bromo-3-benzenepropanoate (97.7 g) was obtained at yield 83.7%. To a 2 L 4-necked round bottom flask that was equipped with an overhead stirrer, an addition funnel, a condenser After the addition was stirred at −35° C. for 1 hr before warming up to 20–25° C. it was stirred for an additional 2 hrs The reaction was then quenched with water (400 mL) and ethyl acetate (600 mL) was added The layers were separated the product was extracted from aqueous layer with ethyl acetate (400 mL×3) The combined organic layers was washed with saturated sodium bicarbonate twice (400 mL×2), water twice (400 mL×2) and brine (500 mL) After the removal of solvent the product (crude, 132 g) was distilled under reduced pressure

Conditions: temp:-35.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a 2 L 4-necked round bottom flask that was equipped with an overhead stirrer, an addition funnel, a condenser and a temperature-probe, was added the solution of sodium ethoxide/ethanol (21% wt. %, 161.8 g) at 20–25° C. under nitrogen. Ethyl 2-benzylacetoacetate (103.1 g, 0.454 mole) was added dropwise. The resulting solution was stirred at 20–25° C. for 30 minutes. The reaction mixture was then cooled to −35° C. with a dry ice/acetone bath. N-Bromosuccinimide (NBS; 97.95 g, 0.545 mole) was added portion-wise over 30 minutes. After the addition was over, the reaction mixture was stirred at −35° C. for 1 hr before warming up to 20–25° C. and it was stirred for an additional 2 hrs. The reaction was then quenched with water (400 mL) and ethyl acetate (600 mL) was added. The layers were separated and the product was extracted from aqueous layer with ethyl acetate (400 mL×3). The combined organic layers was washed with saturated sodium bicarbonate twice (400 mL×2), water twice (400 mL×2) and brine (500 mL). After the removal of solvent, the product (crude, 132 g) was distilled under reduced pressure. Ethyl 2-bromo-3-benzenepropanoate (97.7 g) was obtained at yield 83.7%. To a 2 L 4-necked round bottom flask that was equipped with an overhead stirrer, an addition funnel, a condenser After the addition was stirred at −35° C. for 1 hr before warming up to 20–25° C. it was stirred for an additional 2 hrs The reaction was then quenched with water (400 mL) and ethyl acetate (600 mL) was added The layers were separated the product was extracted from aqueous layer with ethyl acetate (400 mL×3) The combined organic layers was washed with saturated sodium bicarbonate twice (400 mL×2), water twice (400 mL×2) and brine (500 mL) After the removal of solvent the product (crude, 132 g) was distilled under reduced pressure

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

Procedure: 1.4 ml of triethylamine are added dropwise to a solution of 1.8 g of 2-mercapto-1,3-thiazoline and 2.6 g of 2-bromo-hydrocinnamic acid ethyl ester in 15 ml of THF and the whole is stirred under reflux for 6 hours. The reaction mixture is filtered, the filtrate is concentrated by evaporation and the residue is partitioned between ethyl acetate and water. The organic phase is washed with water, dried, concentrated by evaporation and purified by chromatography on silica gel with eluant R. Rf (W)=0.67. under reflux for 6 hours The reaction mixture is filtered the filtrate is concentrated by evaporation the residue is partitioned between ethyl acetate and water The organic phase is washed with water dried concentrated by evaporation purified by chromatography on silica gel with eluant R

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

Procedure: 1.4 ml of triethylamine are added dropwise to a solution of 1.8 g of 2-mercapto-1,3-thiazoline and 2.6 g of 2-bromo-hydrocinnamic acid ethyl ester in 15 ml of THF and the whole is stirred under reflux for 6 hours. The reaction mixture is filtered, the filtrate is concentrated by evaporation and the residue is partitioned between ethyl acetate and water. The organic phase is washed with water, dried, concentrated by evaporation and purified by chromatography on silica gel with eluant R. Rf (W)=0.67. under reflux for 6 hours The reaction mixture is filtered the filtrate is concentrated by evaporation the residue is partitioned between ethyl acetate and water The organic phase is washed with water dried concentrated by evaporation purified by chromatography on silica gel with eluant R

Conditions: temp:-35.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a 2 L 4-necked round bottom flask that was equipped with an overhead stirrer, an addition funnel, a condenser and a temperature-probe, was added the solution of sodium ethoxide/ethanol (21% wt. %, 161.8 g) at 20–25° C. under nitrogen. Ethyl 2-benzylacetoacetate (103.1 g, 0.454 mole) was added dropwise. The resulting solution was stirred at 20–25° C. for 30 minutes. The reaction mixture was then cooled to −35° C. with a dry ice/acetone bath. N-Bromosuccinimide (NBS; 97.95 g, 0.545 mole) was added portion-wise over 30 minutes. After the addition was over, the reaction mixture was stirred at −35° C. for 1 hr before warming up to 20–25° C. and it was stirred for an additional 2 hrs. The reaction was then quenched with water (400 mL) and ethyl acetate (600 mL) was added. The layers were separated and the product was extracted from aqueous layer with ethyl acetate (400 mL×3). The combined organic layers was washed with saturated sodium bicarbonate twice (400 mL×2), water twice (400 mL×2) and brine (500 mL). After the removal of solvent, the product (crude, 132 g) was distilled under reduced pressure. Ethyl 2-bromo-3-benzenepropanoate (97.7 g) was obtained at yield 83.7%. To a 2 L 4-necked round bottom flask that was equipped with an overhead stirrer, an addition funnel, a condenser After the addition was stirred at −35° C. for 1 hr before warming up to 20–25° C. it was stirred for an additional 2 hrs The reaction was then quenched with water (400 mL) and ethyl acetate (600 mL) was added The layers were separated the product was extracted from aqueous layer with ethyl acetate (400 mL×3) The combined organic layers was washed with saturated sodium bicarbonate twice (400 mL×2), water twice (400 mL×2) and brine (500 mL) After the removal of solvent the product (crude, 132 g) was distilled under reduced pressure

Conditions: temp:22.51; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a 2 L 4-necked round bottom flask that was equipped with an overhead stirrer, an addition funnel, a condenser and a temperature-probe, was added the solution of sodium ethoxide/ethanol (21% wt. %, 161.8 g) at 20-25° C. under nitrogen. Ethyl 2-benzylacetoacetate (103.1 g, 0.454 mole) was added dropwise. The resulting solution was stirred at 20-25° C. for 30 minutes. The reaction mixture was then cooled to −35° C. with a dry ice/acetone bath. N-Bromosuccinimide (NBS; 97.95 g, 0.545 mole) was added portion-wise over 30 minutes. After the addition was over, the reaction mixture was stirred at −35° C. for 1 hr before warming up to 20-25° C. and it was stirred for an additional 2 hrs. The reaction was then quenched with water (400 mL) and ethyl acetate (600 mL) was added. The layers were separated and the product was extracted from aqueous layer with ethyl acetate (400 mL×3). The combined organic layers was washed with saturated sodium bicarbonate twice (400 mL×2), water twice (400 mL×2) and brine (500 mL). After the removal of solvent, the product (crude, 132 g) was distilled under reduced pressure. Ethyl 2-bromo-3-benzenepropanoate (97.7 g) was obtained at yield 83.7%. To a 2 L 4-necked round bottom flask that was equipped with an overhead stirrer, an addition funnel, a condenser The reaction mixture was then cooled to −35° C. with a dry ice/acetone bath After the addition was stirred at −35° C. for 1 hr before warming up to 20-25° C. it was stirred for an additional 2 hrs The reaction was then quenched with water (400 mL) and ethyl acetate (600 mL) was added The layers were separated the product was extracted from aqueous layer with ethyl acetate (400 mL×3) The combined organic layers was washed with saturated sodium bicarbonate twice (400 mL×2), water twice (400 mL×2) and brine (500 mL) After the removal of solvent the product (crude, 132 g) was distilled under reduced pressure

Conditions: temp:-35.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a 2 L 4-necked round bottom flask that was equipped with an overhead stirrer, an addition funnel, a condenser and a temperature-probe, was added the solution of sodium ethoxide/ethanol (21% wt. %, 161.8 g) at 20–25° C. under nitrogen. Ethyl 2-benzylacetoacetate (103.1 g, 0.454 mole) was added dropwise. The resulting solution was stirred at 20–25° C. for 30 minutes. The reaction mixture was then cooled to −35° C. with a dry ice/acetone bath. N-Bromosuccinimide (NBS; 97.95 g, 0.545 mole) was added portion-wise over 30 minutes. After the addition was over, the reaction mixture was stirred at −35° C. for 1 hr before warming up to 20–25° C. and it was stirred for an additional 2 hrs. The reaction was then quenched with water (400 mL) and ethyl acetate (600 mL) was added. The layers were separated and the product was extracted from aqueous layer with ethyl acetate (400 mL×3). The combined organic layers was washed with saturated sodium bicarbonate twice (400 mL×2), water twice (400 mL×2) and brine (500 mL). After the removal of solvent, the product (crude, 132 g) was distilled under reduced pressure. Ethyl 2-bromo-3-benzenepropanoate (97.7 g) was obtained at yield 83.7%. To a 2 L 4-necked round bottom flask that was equipped with an overhead stirrer, an addition funnel, a condenser After the addition was stirred at −35° C. for 1 hr before warming up to 20–25° C. it was stirred for an additional 2 hrs The reaction was then quenched with water (400 mL) and ethyl acetate (600 mL) was added The layers were separated the product was extracted from aqueous layer with ethyl acetate (400 mL×3) The combined organic layers was washed with saturated sodium bicarbonate twice (400 mL×2), water twice (400 mL×2) and brine (500 mL) After the removal of solvent the product (crude, 132 g) was distilled under reduced pressure

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

Procedure: 1.4 ml of triethylamine are added dropwise to a solution of 1.8 g of 2-mercapto-1,3-thiazoline and 2.6 g of 2-bromo-hydrocinnamic acid ethyl ester in 15 ml of THF and the whole is stirred under reflux for 6 hours. The reaction mixture is filtered, the filtrate is concentrated by evaporation and the residue is partitioned between ethyl acetate and water. The organic phase is washed with water, dried, concentrated by evaporation and purified by chromatography on silica gel with eluant R. Rf (W)=0.67. under reflux for 6 hours The reaction mixture is filtered the filtrate is concentrated by evaporation the residue is partitioned between ethyl acetate and water The organic phase is washed with water dried concentrated by evaporation purified by chromatography on silica gel with eluant R