ETHYL 2-PHENYLPROPIONATE

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: Dissolve 2-phenylpropionic acid (30 g) in 2B ethanol (100 mL and add anhydrous HCl (10 g). Allow to sit for 48-72 hours, evaporate the solvent in vacuo and purify by distillation. to give ethyl 2-phenylpropionate (31 g); bp 100° C. at 6 mmm. evaporate the solvent in vacuo purify by distillation

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

Procedure: Dissolve 2-phenylpropionic acid (30 g) in 2B ethanol (100 mL and add anhydrous HCl (10 g). Allow to sit for 48-72 hours, evaporate the solvent in vacuo and purify by distillation to give ethyl 2-phenylpropionate (31 g); bp 100 C at 6 mmm. evaporate the solvent in vacuo purify by distillation

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

Procedure: Under N2 atmosphere, a solution of LDA (2.0 M in heptane/THF/ethylbenzene, 1.85 mL, 3.70 mol) was added dropwise to a stirred solution of 202 (660 g, 3.70 mol) in anhydrous THF (6.6 L) over 30 min at −78° C. After 1 h, 1,5-dibromopentane (1390 g, 6.05 mol) was added, followed by the addition of DMPU (660 mL). The reaction mixture was stirred for 1 h, then warmed to room temperature and stirred overnight. The mixture was poured into saturated aqueous NH4Cl solution (24 L) and extracted with ethyl acetate (4×6.7 L). The combined organic layers were washed with brine (9 L), 1 N HCl (6 L), saturated aqueous NaHCO3 solution (6 L), and brine (6 L). The solution was dried over MgSO4 and concentrated in vacuo. The residue was distilled in high vacuo to yield 205h (700g, 58%) as a yellowish oil. Bp 140-145° C./0.3 mmHg. 1H NMR (CDCl3): δ 7.30-7.20 (m, 5 H), 4.09 (m, 2 H), 3.34 (t, 2 H, J=6.9), 2.05-1.80 (m, 4 H), 1.53 (s, 3 H), 1.43-1.14 (m, 4 H), 1.16 (t, 3 H, J=6.6). 13C NMR (CDCl3): δ 176.03, 143.99, 128.33, 126.60, 125.89, 60.68, 50.11, 39.03, 33.75, 32.51, 28.59, 23.93, 22.78, 14.10. HRMS (LSIMS, nba): Calcd for C16H24BrO2 (MH+): 327.0960, found: 327.0952. HPLC: 91.2% pure. stirred overnight extracted with ethyl acetate (4×6.7 L) The combined organic layers were washed with brine (9 L), 1 N HCl (6 L), saturated aqueous NaHCO3 solution (6 L), and brine (6 L) The solution was dried over MgSO4 concentrated in vacuo The residue was distilled in high vacuo

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

Procedure: A solution of LDA (14 mL, 28 mmol, 2.0 M in heptane) was added dropwise to a stirred solution of 202 (5.0 g, 28.06 mmol) in anhydrous THF (50 mL) at −78° C. After 1 h, the reaction mixture was added to a −78° C. cold solution of 1,4-dibromobutane (10.06 g, 23.1 mmol) in THF. After the addition of DMPU (5 mL), the reaction mixture was stirred for 1 h, then warmed to room temperature and stirred overnight. The mixture was poured into saturated aqueous NH4Cl solution (500 mL) and extracted with ethyl acetate (4×100 mL). The combined organic phases were washed with brine (100 mL), 1 M HCl (50 mL), saturated aqueous NaHCO3 solution (50 mL), and brine (100 mL). The solution was dried over anhydrous MgSO4 and concentrated in vacuo. The residue was distilled to give 205d as an oil (7.16 g, 99%). Bp 130-131° C./0.2 mm Hg. 1H NMR (CDCl3), δ (ppm): 7.40-7.15 (m, 5 H), 4.13 (q, 2 H, J=6.7), 3.36 (t, 2 H, J=6.7), 2.02 (m, 2 H), 1.86 (m, 2 H), 1.56 (s, 3 H), 1.34 (m, 2 H), 1.18 (t, 3 H, J=6.7). 13C NMR (CDCl3), δ (ppm): 176.13, 143.91, 128.51, 126.81, 126.03, 60.93, 50.22, 38.53, 33.56, 33.30, 23.58, 22.77, 14.22. HRMS (FAB): Calcd for C15H2179BrO2 (MH+): 313.0803, found 313.0786. stirred overnight extracted with ethyl acetate (4×100 mL) The combined organic phases were washed with brine (100 mL), 1 M HCl (50 mL), saturated aqueous NaHCO3 solution (50 mL), and brine (100 mL) The solution was dried over anhydrous MgSO4 concentrated in vacuo The residue was distilled

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

Procedure: According to the procedure given for the synthesis of 202, ethyl p-tolylacetate (2.72 g, 15.2 mmol) was reacted with LDA (7.6 mL, 15.25 mmol) and methyl iodide (3.03 g, 21.30 mmol) in anhydrous THF (70 mL) and DMPU (1 mL). After aqueous workup and extraction, the residue was distilled in high vacuo to give 203 (2.5 g, 86.0%) as an oil. Bp 59-63° C./0.2 mmHg. 1H NMR (CDCl3): δ (ppm) 7.18 (d, 2 H, J=8.1), 7.10 (d, 2 H, J=8.1), 4.09 (m, 2 H), 3.67 (q, 1 H, J=7.2), 2.29 (s, 3 H), 1.47 (d, J=7.2 Hz, 3 H), 1.20 (t, J=5.7 Hz, 3 H). 13C NMR (75 MHz, CDCl3/TMS): δ (ppm) 174.71, 137.80, 136.63, 129.33, 129.14, 127.36, 60.66, 45.18, 21.05, 18.70, 14.15. After aqueous workup and extraction the residue was distilled in high vacuo

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

Procedure: Under N2 atmosphere, a solution of ethyl phenylacetate (800.0 g, 4.87 mol) in anhydrous THF (6.4 L) was cooled to −40° C. and a solution of LDA (2.0 M in heptane/THF, ethylbenzene, 2.43 L, 4.86 mol) was added dropwise over 30 min. The reaction mixture was stirred for 1 h, and methyl iodide (968 g, 6.82 mol) was added dropwise over 20 min, followed by the addition of DMPU (320 mL). After 1 h, the reaction mixture was allowed to warm to room temperature and stirred overnight. The reaction mixture was poured into water (6.4 L) and extracted with ethyl acetate (3×1.6 L). The combined organic layers were washed with saturated aqueous NH4Cl solution (1.6 L), 1 N HCl (1.6 L), saturated aqueous NaHCO3 solution (1.6 L), and saturated aqueous NaCl solution (1.6 L). The solution was dried over MgSO4 and concentrated in vacuo. The residue was distilled in high vacuo to give 202 (620.0 g, 72%) as a colorless oil. Bp 55-60° C./0.2 Torr (lit. (Shiner, V. J. et al. J. Am. Chem. Soc. 1961, 83, 593-598) by 59-60° C./0.3 Torr). 1H NMR (CDCl3): δ 7.36-7.18 (m, 5 H), 4.11 (m, 2 H), 3.69 (q, 1 H, J=7.1), 1.49 (d, 3 H, J=7.1), 1.19 (t, 3 H, J=7.1). 13C NMR (CDCl3): δ 174.44, 140.73, 128.57, 127.48, 127.04, 60.66, 45.59, 18.66, 14.16. After 1 h stirred overnight extracted with ethyl acetate (3×1.6 L) The combined organic layers were washed with saturated aqueous NH4Cl solution (1.6 L), 1 N HCl (1.6 L), saturated aqueous NaHCO3 solution (1.6 L), and saturated aqueous NaCl solution (1.6 L) The solution was dried over MgSO4 concentrated in vacuo The residue was distilled in high vacuo

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

Procedure: Dissolve 2-phenylpropionic acid (30 g) in 2B ethanol (100 mL and add anhydrous HCl (10 g). Allow to sit for 48-72 hours, evaporate the solvent in vacuo and purify by distillation to give ethyl 2-phenylpropionate (31 g); bp 100 C. at 6 mmm. evaporate the solvent in vacuo purify by distillation

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

Procedure: Dissolve 2-phenylpropionic acid (30 g) in 2B ethanol (100 mL and add anhydrous HCl (10 g). Allow to sit for 48-72 hours, evaporate the solvent in vacuo and purify by distillation to give ethyl 2-phenylpropionate (31 g); bp 100 C. at 6 mmm. evaporate the solvent in vacuo purify by distillation

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

Procedure: Dissolve 2-phenylpropionic acid (30 g) in 2B ethanol (100 mL and add anhydrous HCl (10 g). Allow to sit for 48-72 hours, evaporate the solvent in vacuo and purify by distillation to give ethyl 2-phenylpropionate (31 g); bp 100 C. at 6 mmm. evaporate the solvent in vacuo purify by distillation

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

Procedure: Dissolve 2-phenylpropionic acid (30 g) in 2B ethanol (100 mL and add anhydrous HCl (10 g). Allow to sit for 48-72 hours, evaporate the solvent in vacuo and purify by distillation to give ethyl 2-phenylpropionate (31 g); bp 100 C. at 6 mmm. evaporate the solvent in vacuo purify by distillation