tert-butyl (2S)-2-hydroxypropanoate

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

Procedure: To a solution of triphenylphosphine (0.315 g, 1.2 mmol) in tetrahydrofuran (THF, 5.0 mL) was added diethyl azodicarboxylate (0.19 mL, 1.2 mmol) and tert-butyl(S)-2-hydroxypropanoate (292 mg, 2 mmol) followed by 4-(2-aminopyrimidin-5-yl)-2-fluorophenol (0.20 g, 1.0 mmol) at RT (RT) under nitrogen. The mixture was stirred overnight at RT, evaporated and the residue was purified by chromatography on silica gel to afford the desired product (0.24 g, 72%). LCMS: (M+H)=334. 1. (RT) evaporated the residue was purified by chromatography on silica gel

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

Procedure: In a 500 ml round-bottomed flask, 3.00 g of tert-butyl L-lactate (ee>99%) was dissolved in 165 ml of absolute dichloromethane and cooled to 0° C. under argon. Thereafter, first 3.10 ml of 2.6-lutidine and then slowly 4.15 ml of trifluoromethanesulphonic anhydride were added in succession and the reaction was stirred for 50 min at 0° C. Thereafter, the reaction mixture was diluted with 400 ml of petroleum ether, washed 4 times with 250 ml of a 3:1 mixture of saturated aqueous sodium chloride solution and 1 N hydrochloric acid, dried over MgSO4 and concentrated in vacuo. The residue was applied to a silica gel filter and washed off said filter with a 1:1 mixture of petroleum ether and dichloromethane. After removal of the solvent, the pure tert-butyl (S)-2-trifluoromethanesulphonyloxypropionate (ee>99%) was obtained in a yield of 90%. washed 4 times with 250 ml of a 3:1 mixture of saturated aqueous sodium chloride solution and 1 N hydrochloric acid dried over MgSO4 concentrated in vacuo filter washed off said filter with a 1:1 mixture of petroleum ether and dichloromethane After removal of the solvent

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

Procedure: To a stirred solution of known tert-butyl L-(+)-lactate (0.88 g), 4-(2',4'-dichlorophenoxy)phenol (1.54 g) and triphenylphosphine (1.58 g) in dry tetrahydrofuran (58 ml) on an ice bath, diethylazodicarboxylate (0.95 ml) was added dropwise. After the addition, the ice bath was removed and the mixture was further stirred at room temperature for 25 hours. The reaction mixture was evaporated with a rotary evaporator. The residue thus obtained was purified by silica gel chromatography [silica gel 399 g, eluant:ethyl acetate-hexane (1:30)] to give tert-butyl (2R)-(+)-2-[4'-(2",4"-dichlorophenoxy)phenoxy]propionate as a colorless oily substance (0.98 g). This was left to stand at room temperature under high vacuum (0.25 Torr) for 2 hours and under atmosphere for several days to crystallize. A crystalline substance thus formed was washed with a small amount of hexane and filtered to give colorless crystals. After the addition the ice bath was removed The reaction mixture was evaporated with a rotary evaporator The residue thus obtained was purified by silica gel chromatography [silica gel 399 g, eluant:ethyl acetate-hexane (1:30)]

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

Procedure: To a stirred solution of known tert-butyl L-(+)-lactate (1.00 g), 4-(2',4'-dinitrophenoxy)phenol (2.08 g) and triphenylphosphine (1.98 g) in dry tetrahydrofuran (58 ml) on an ice bath, diethylazodicarboxylate (1.18 ml) was added dropwise. After the addition, the ice bath was removed and the mixture was further stirred at room temperature for 19 hours. The reaction mixture was evaporated with a rotary evaporator. The residue thus obtained was purified by silica gel chromatography [silica gel 344 g, eluant:ethyl acetate-hexane (1:5)] to give tert-butyl (2R)-(+)-2-(4'-(2",4"-dinitrophenoxy)phenoxy]propionate (1.45 g). Since the product was decomosed even by high vacuum distillation, the viscous oily substance of the product thus obtained was left to stand at room temperature under high vacuum (0.25 Torr) for 2 hours, and then its physical data thereon were measured. After the addition the ice bath was removed The reaction mixture was evaporated with a rotary evaporator The residue thus obtained was purified by silica gel chromatography [silica gel 344 g, eluant:ethyl acetate-hexane (1:5)]

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

Procedure: To a stirred solution of known tert-butyl L-(+)-lactate (217 mg), 4-chlorophenol (219 μl) and triphenylphosphine (584 mg) in dry tetrahydrofuran (8 ml) on an ice bath, diethylazodicarboxylate (350 μl) was added dropwise over about 10 minutes. After the addition, the ice bath was removed and the mixture was further stirred at room temperatures for 24 hours. The reaction mixture was evaporated with a rotary evaporator (water bath temperaure 38° C.). The residue thus obtained was purified by silica gel chromatography [silica gel 50 g, eluant:ethyl acetate-hexane (1:10)] to give tert-butyl (2R)-(+)-2-(4'-chlorophenoxy)propionate (256 mg). After the addition the ice bath was removed The reaction mixture was evaporated with a rotary evaporator (water bath temperaure 38° C.) The residue thus obtained was purified by silica gel chromatography [silica gel 50 g, eluant:ethyl acetate-hexane (1:10)]

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

Procedure: To a solution of triphenylphosphine (0.315 g, 1.2 mmol) in tetrahydrofuran (THF, 5.0 mL) was added diethyl azodicarboxylate (0.19 mL, 1.2 mmol) and tert-butyl (S)-2-hydroxypropanoate (292 mg, 2 mmol) followed by 4-(2-aminopyrimidin-5-yl)-2-fluorophenol (0.20 g, 1.0 mmol) at RT (RT) under nitrogen. The mixture was stirred overnight at RT, evaporated and the residue was purified by chromatography on silica gel to afford the desired product (0.24 g, 72%). LCMS: (M+H)=334.1. (RT) evaporated the residue was purified by chromatography on silica gel

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

Procedure: To a solution of triphenylphosphine (0.315 g, 1.2 mmol) in tetrahydrofuran (THF, 5.0 mL) was added diethyl azodicarboxylate (0.19 mL, 1.2 mmol) and tert-butyl(S)-2-hydroxypropanoate (292 mg, 2 mmol) followed by 4-(2-aminopyrimidin-5-yl)-2-fluorophenol (0.20 g, 1.0 mmol) at RT (RT) under nitrogen. The mixture was stirred overnight at RT, evaporated and the residue was purified by chromatography on silica gel to afford the desired product (0.24 g, 72%). LCMS: (M+H)=334. 1. (RT) evaporated the residue was purified by chromatography on silica gel