methyl 2-(4-fluorophenyl)propanoate

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

Procedure: To a stirred solution of diisopropylamine (13.0 g) in tetrahydrofurane (160 mL) was added a solution of n-butyllithium in hexane (51.4 mL; c=2.5 M) at −78° C. The solution was stirred at 0° C. for 15 minutes. The solution was cooled to −78° C. and a solution of methyl (4-fluorophenyl)acetate (18.0 g), dissolved in tetrahydrofurane (40 mL) was added. The solution was stirred at −78° C. for 30 minutes. Methyl iodide (10.0 mL) was added at −78° C., and the solution was allowed to warm up to 0° C. within 1 h. Water was added and the reaction mixture was extracted with ethyl acetate. The organic phase was dried (sodium sulfate) and the solvent was removed in vacuum. Silicagel chromatography gave 18.9 g of the title compound. The solution was cooled to −78° C. was added The solution was stirred at −78° C. for 30 minutes to warm up to 0° C. within 1 h the reaction mixture was extracted with ethyl acetate The organic phase was dried (sodium sulfate) the solvent was removed in vacuum

Conditions: temp:25.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of the compound of Example 22A (11.75 g, 64.6 mmol) in tetrahydrofuran (30 mL) was added dropwise over 20 min to a −78° C. solution of lithium hexamethyldisilazide (previously prepared from hexamethyldisilazane (17.0 mL, 80.7 mmol) and n-butyllithium in hexane (2.5 M, 31.0 mL, 77.5 mmol)) in tetrahydrofuran (40 mL) and allowed to stir at that temperature for 1 h. The solution was then treated with 1-bromo-3,3-dimethylbutane (12.0 mL, 83.9 mmol), followed by stirring at −78° C. for 30 min, and then warming to 25° C. for 18 h. The solution was quenched by addition of saturated ammonium chloride solution (4 mL) and then concentrated in vacuo. The residue was diluted with ethyl acetate and water. The organic layer was extracted with water (2×), saturated NaCl solution and dried (Na2SO4). Concentration in vacuo afforded an oil, which was distilled under reduced pressure (90-93° C./0.3 mm Hg) to afford the product (4.85 g, 28%) as a colorless oil. 1H NMR (300 MHz, CDCl3): δ 0.86 (s, 9 H) 1.03 (m, 2 H) 1.51 (m, 3 H) 1.86 (m, 1 H) 2.00 (m, 1 H) 3.65 (m, 3H) 7.03 (m, 2 H) 7.27 (m, 2 H). by stirring at −78° C. for 30 min The solution was quenched by addition of saturated ammonium chloride solution (4 mL) concentrated in vacuo The residue was diluted with ethyl acetate and water The organic layer was extracted with water (2×), saturated NaCl solution dried (Na2SO4) Concentration in vacuo afforded an oil, which was distilled under reduced pressure (90-93° C./0.3 mm Hg)

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of the compound of Example 22A (10.0 g, 55 mmol) in tetrahydrofuran (30 mL) was added dropwise over 30 min to a −78° C. solution of lithium hexamethyldisilazide (prepared from hexamethyldisilazane (14.5 mL, 68.7 mmol) and n-butyllithium in hexane (2.5 M, 26.4 mL, 65.9 mmol)). The solution was stirred at −78° C. for 1 h. The solution was then treated with neat isoamyl bromide (9.9 mL, 82.4 mmol) followed by stirring at −78° C. for 30 min, and then warming to ambient temperature for 48 h. The solution was quenched by addition of saturated ammonium chloride solution (6 mL) and diluted with water. The mixture was concentrated in vacuo to remove tetrahydrofuran, and then extracted with ethyl acetate. The organic layer was extracted with water (2×) and saturated NaCl solution. Drying (Na2SO4) and concentration in vacuo afforded a brown oil, which was distilled under reduced pressure (90-93° C./0.3 mm Hg) to afford the title compound (11.8 g, 85%) as a colorless oil. 1H NMR (300 MHz, CDCl3): δ 0.87 (m, 6 H) 1.03 (m, 2 H) 1.51 (m, 4 H) 1.95 (m, 2 H) 3.65 (s, 3 H) 7.01 (m, 2 H) 7.28 (m, 2 H). by stirring at −78° C. for 30 min warming to ambient temperature for 48 h The solution was quenched by addition of saturated ammonium chloride solution (6 mL) diluted with water The mixture was concentrated in vacuo to remove tetrahydrofuran extracted with ethyl acetate The organic layer was extracted with water (2×) and saturated NaCl solution Drying (Na2SO4) and concentration in vacuo afforded a brown oil, which was distilled under reduced pressure (90-93° C./0.3 mm Hg)

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of the compound of Example 14A (23.2 g, 0.138 mol) in dry tetrahydrofuran (30 mL) was added dropwise over 30 min to a −78° C. solution of lithium hexamethyldisilazide (prepared from hexamethyldisilazane (35 mL, 0.165 mol) and n-butyllithium in hexane (2.5 M, 58 mL, 0.145 mol)) in dry tetrahydrofuran (100 mL). The solution was stirred at −78° C. for 1 h, and then a large excess of methyl iodide was added. The solution was stirred at −78° C. for 30 min and was then warmed to ambient temperature for 18 h. The solution was quenched by addition of saturated ammonium chloride solution and diluted with water. The mixture was concentrated in vacuo to remove tetrahydrofuran and then extracted with ethyl acetate. The organic layer was extracted with water (2×) and saturated NaCl solution, followed by drying (Na2SO4) and concentration in vacuo. The residue was distilled under reduced pressure (70-75° C./0.5 mm Hg) to afford the title compound (21.9 g, 87%) as a colorless oil. 1H NMR (300 MHz, CDCl3): δ 1.49 (d, J=7.35 Hz, 3 H) 3.70 (m, 4 H) 7.01 (m, 2 H) 7.27 (m, 2 H). The solution was stirred at −78° C. for 30 min was then warmed to ambient temperature for 18 h The solution was quenched by addition of saturated ammonium chloride solution diluted with water The mixture was concentrated in vacuo to remove tetrahydrofuran extracted with ethyl acetate The organic layer was extracted with water (2×) and saturated NaCl solution by drying (Na2SO4) and concentration in vacuo The residue was distilled under reduced pressure (70-75° C./0.5 mm Hg)

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of the compound of Example 14A (23.2 g, 0.138 mol) in dry tetrahydrofuran (30 mL) was added dropwise over 30 min to a −78° C. solution of lithium hexamethyldisilazide (prepared from hexamethyldisilazane (35 mL, 0.165 mol) and n-butyllithium in hexane (2.5 M, 58 mL, 0.145 mol)) in dry tetrahydrofuran (100 mL). The solution was stirred at −78° C. for 1 h, and then a large excess of methyl iodide was added. The solution was stirred at −78° C. for 30 min and was then warmed to ambient temperature for 18 h. The solution was quenched by addition of saturated ammonium chloride solution and diluted with water. The mixture was concentrated in vacuo to remove tetrahydrofuran and then extracted with ethyl acetate. The organic layer was extracted with water (2×) and saturated NaCl solution, followed by drying (Na2SO4) and concentration in vacuo. The residue was distilled under reduced pressure (70-75° C./0.5 mm Hg) to afford the title compound (21.9 g, 87%) as a colorless oil. 1H NMR (300 MHz, CDCl3): δ 1.49 (d, J=7.35 Hz, 3 H) 3.70 (m, 4 H) 7.01 (m, 2 H) 7.27 (m, 2 H). The solution was stirred at −78° C. for 30 min was then warmed to ambient temperature for 18 h The solution was quenched by addition of saturated ammonium chloride solution diluted with water The mixture was concentrated in vacuo to remove tetrahydrofuran extracted with ethyl acetate The organic layer was extracted with water (2×) and saturated NaCl solution by drying (Na2SO4) and concentration in vacuo The residue was distilled under reduced pressure (70-75° C./0.5 mm Hg)

Conditions: temp:25.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of the compound of Example 22A (11.75 g, 64.6 mmol) in tetrahydrofuran (30 mL) was added dropwise over 20 min to a −78° C. solution of lithium hexamethyldisilazide (previously prepared from hexamethyldisilazane (17.0 mL, 80.7 mmol) and n-butyllithium in hexane (2.5 M, 31.0 mL, 77.5 mmol)) in tetrahydrofuran (40 mL) and allowed to stir at that temperature for 1 h. The solution was then treated with 1-bromo-3,3-dimethylbutane (12.0 mL, 83.9 mmol), followed by stirring at −78° C. for 30 min, and then warming to 25° C. for 18 h. The solution was quenched by addition of saturated ammonium chloride solution (4 mL) and then concentrated in vacuo. The residue was diluted with ethyl acetate and water. The organic layer was extracted with water (2×), saturated NaCl solution and dried (Na2SO4). Concentration in vacuo afforded an oil, which was distilled under reduced pressure (90-93° C./0.3 mm Hg) to afford the product (4.85 g, 28%) as a colorless oil. 1H NMR (300 MHz, CDCl3): δ 0.86 (s, 9 H) 1.03 (m, 2 H) 1.51 (m, 3 H) 1.86 (m, 1 H) 2.00 (m, 1 H) 3.65 (m, 3 H) 7.03 (m, 2 H) 7.27(m, 2 H). by stirring at −78° C. for 30 min The solution was quenched by addition of saturated ammonium chloride solution (4 mL) concentrated in vacuo The residue was diluted with ethyl acetate and water The organic layer was extracted with water (2×), saturated NaCl solution dried (Na2SO4) Concentration in vacuo afforded an oil, which was distilled under reduced pressure (90-93° C./0.3 mm Hg)

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of the compound of Example 22A (10.0 g, 55 mmol) in tetrahydrofuran (30 mL) was added dropwise over 30 min to a −78° C. solution of lithium hexamethyldisilazide (prepared from hexamethyldisilazane (14.5 mL, 68.7 mmol) and n-butyllithium in hexane (2.5 M, 26.4 mL, 65.9 mmol)). The solution was stirred at −78° C. for 1 h. The solution was then treated with neat isoamyl bromide (9.9 mL, 82.4 mmol) followed by stirring at −78° C. for 30 min, and then warming to ambient temperature for 48 h. The solution was quenched by addition of saturated ammonium chloride solution (6 mL) and diluted with water. The mixture was concentrated in vacuo to remove tetrahydrofuran, and then extracted with ethyl acetate. The organic layer was extracted with water (2×) and saturated NaCl solution. Drying (Na2SO4) and concentration in vacuo afforded a brown oil, which was distilled under reduced pressure (90-93° C./0.3 mm Hg) to afford the title compound (11.8 g, 85%) as a colorless oil. 1H NMR (300 MHz, CDCl3): δ 0.87 (m, 6 H) 1.03 (m, 2 H) 1.51 (m, 4 H) 1.95 (m, 2 H) 3.65 (s, 3 H) 7.01 (m, 2 H) 7.28 (m, 2 H). by stirring at −78° C. for 30 min warming to ambient temperature for 48 h The solution was quenched by addition of saturated ammonium chloride solution (6 mL) diluted with water The mixture was concentrated in vacuo to remove tetrahydrofuran extracted with ethyl acetate The organic layer was extracted with water (2×) and saturated NaCl solution Drying (Na2SO4) and concentration in vacuo afforded a brown oil, which was distilled under reduced pressure (90-93° C./0.3 mm Hg)

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of the compound of Example 14A (23.2 g, 0.138 mol) in dry tetrahydrofuran (30 mL) was added dropwise over 30 min to a −78° C. solution of lithium hexamethyldisilazide (prepared from hexamethyldisilazane (35 mL, 0.165 mol) and n-butyllithium in hexane (2.5 M, 58 mL, 0.145 mol)) in dry tetrahydrofuran (100 mL). The solution was stirred at −78° C. for 1 h, and then a large excess of methyl iodide was added. The solution was stirred at −78° C. for 30 min and was then warmed to ambient temperature for 18 h. The solution was quenched by addition of saturated ammonium chloride solution and diluted with water. The mixture was concentrated in vacuo to remove tetrahydrofuran and then extracted with ethyl acetate. The organic layer was extracted with water (2×) and saturated NaCl solution, followed by drying (Na2SO4) and concentration in vacuo. The residue was distilled under reduced pressure (70-75° C./0.5 mm Hg) to afford the title compound (21.9 g, 87%) as a colorless oil. 1H NMR (300 MHz, CDCl3): δ 1.49 (d, J=7.35 Hz, 3 H) 3.70 (m, 4 H) 7.01 (m, 2 H) 7.27 (m, 2 H). The solution was stirred at −78° C. for 30 min was then warmed to ambient temperature for 18 h The solution was quenched by addition of saturated ammonium chloride solution diluted with water The mixture was concentrated in vacuo to remove tetrahydrofuran extracted with ethyl acetate The organic layer was extracted with water (2×) and saturated NaCl solution by drying (Na2SO4) and concentration in vacuo The residue was distilled under reduced pressure (70-75° C./0.5 mm Hg)

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

Procedure: To a stirred solution of diisopropylamine (13.0 g) in tetrahydrofurane (160 mL) was added a solution of n-butyllithium in hexane (51.4 mL; c=2.5 M) at −78° C. The solution was stirred at 0° C. for 15 minutes. The solution was cooled to −78° C. and a solution of methyl (4-fluorophenyl)acetate (18.0 g), dissolved in tetrahydrofurane (40 mL) was added. The solution was stirred at −78° C. for 30 minutes. Methyl iodide (10.0 mL) was added at −78° C., and the solution was allowed to warm up to 0° C. within 1 h. Water was added and the reaction mixture was extracted with ethyl acetate. The organic phase was dried (sodium sulfate) and the solvent was removed in vacuum. Silicagel chromatography gave 18.9 g of the title compound. The solution was cooled to −78° C. was added The solution was stirred at −78° C. for 30 minutes to warm up to 0° C. within 1 h the reaction mixture was extracted with ethyl acetate The organic phase was dried (sodium sulfate) the solvent was removed in vacuum

Conditions: temp:25.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of the compound of Example 22A (11.75 g, 64.6 mmol) in tetrahydrofuran (30 mL) was added dropwise over 20 min to a −78° C. solution of lithium hexamethyldisilazide (previously prepared from hexamethyldisilazane (17.0 mL, 80.7 mmol) and n-butyllithium in hexane (2.5 M, 31.0 mL, 77.5 mmol)) in tetrahydrofuran (40 mL) and allowed to stir at that temperature for 1 h. The solution was then treated with 1-bromo-3,3-dimethylbutane (12.0 mL, 83.9 mmol), followed by stirring at −78° C. for 30 min, and then warming to 25° C. for 18 h. The solution was quenched by addition of saturated ammonium chloride solution (4 mL) and then concentrated in vacuo. The residue was diluted with ethyl acetate and water. The organic layer was extracted with water (2×), saturated NaCl solution and dried (Na2SO4). Concentration in vacuo afforded an oil, which was distilled under reduced pressure (90-93° C./0.3 mm Hg) to afford the product (4.85 g, 28%) as a colorless oil. 1H NMR (300 MHz, CDCl3): δ 0.86 (s, 9 H) 1.03 (m, 2 H) 1.51 (m, 3 H) 1.86 (m, 1 H) 2.00 (m, 1 H) 3.65 (m, 3H) 7.03 (m, 2 H) 7.27 (m, 2 H). by stirring at −78° C. for 30 min The solution was quenched by addition of saturated ammonium chloride solution (4 mL) concentrated in vacuo The residue was diluted with ethyl acetate and water The organic layer was extracted with water (2×), saturated NaCl solution dried (Na2SO4) Concentration in vacuo afforded an oil, which was distilled under reduced pressure (90-93° C./0.3 mm Hg)

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of the compound of Example 22A (10.0 g, 55 mmol) in tetrahydrofuran (30 mL) was added dropwise over 30 min to a −78° C. solution of lithium hexamethyldisilazide (prepared from hexamethyldisilazane (14.5 mL, 68.7 mmol) and n-butyllithium in hexane (2.5 M, 26.4 mL, 65.9 mmol)). The solution was stirred at −78° C. for 1 h. The solution was then treated with neat isoamyl bromide (9.9 mL, 82.4 mmol) followed by stirring at −78° C. for 30 min, and then warming to ambient temperature for 48 h. The solution was quenched by addition of saturated ammonium chloride solution (6 mL) and diluted with water. The mixture was concentrated in vacuo to remove tetrahydrofuran, and then extracted with ethyl acetate. The organic layer was extracted with water (2×) and saturated NaCl solution. Drying (Na2SO4) and concentration in vacuo afforded a brown oil, which was distilled under reduced pressure (90-93° C./0.3 mm Hg) to afford the title compound (11.8 g, 85%) as a colorless oil. 1H NMR (300 MHz, CDCl3): δ 0.87 (m, 6 H) 1.03 (m, 2 H) 1.51 (m, 4 H) 1.95 (m, 2 H) 3.65 (s, 3 H) 7.01 (m, 2 H) 7.28 (m, 2 H). by stirring at −78° C. for 30 min warming to ambient temperature for 48 h The solution was quenched by addition of saturated ammonium chloride solution (6 mL) diluted with water The mixture was concentrated in vacuo to remove tetrahydrofuran extracted with ethyl acetate The organic layer was extracted with water (2×) and saturated NaCl solution Drying (Na2SO4) and concentration in vacuo afforded a brown oil, which was distilled under reduced pressure (90-93° C./0.3 mm Hg)

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of the compound of Example 14A (23.2 g, 0.138 mol) in dry tetrahydrofuran (30 mL) was added dropwise over 30 min to a −78° C. solution of lithium hexamethyldisilazide (prepared from hexamethyldisilazane (35 mL, 0.165 mol) and n-butyllithium in hexane (2.5 M, 58 mL, 0.145 mol)) in dry tetrahydrofuran (100 mL). The solution was stirred at −78° C. for 1 h, and then a large excess of methyl iodide was added. The solution was stirred at −78° C. for 30 min and was then warmed to ambient temperature for 18 h. The solution was quenched by addition of saturated ammonium chloride solution and diluted with water. The mixture was concentrated in vacuo to remove tetrahydrofuran and then extracted with ethyl acetate. The organic layer was extracted with water (2×) and saturated NaCl solution, followed by drying (Na2SO4) and concentration in vacuo. The residue was distilled under reduced pressure (70-75° C./0.5 mm Hg) to afford the title compound (21.9 g, 87%) as a colorless oil. 1H NMR (300 MHz, CDCl3): δ 1.49 (d, J=7.35 Hz, 3 H) 3.70 (m, 4 H) 7.01 (m, 2 H) 7.27 (m, 2 H). The solution was stirred at −78° C. for 30 min was then warmed to ambient temperature for 18 h The solution was quenched by addition of saturated ammonium chloride solution diluted with water The mixture was concentrated in vacuo to remove tetrahydrofuran extracted with ethyl acetate The organic layer was extracted with water (2×) and saturated NaCl solution by drying (Na2SO4) and concentration in vacuo The residue was distilled under reduced pressure (70-75° C./0.5 mm Hg)