ethyl 2-(3-chlorophenoxy)acetate

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

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: To 20.6 g (166 mmol, 238 mol %) of dimethyl methylphosphonate in 110 mL of THF at −78° C. was added dropwise 65 mL (162 mmol, 232 mol %) of a 2.5M solution of n-BuLi in hexanes. After addition was complete, the mixture was stirred for an additional 1 h, after which 15.0 g (69.9 mmol) of aryloxyester 10 in 40 mL of THF was added dropwise. The reaction was stirred for 1 h and then quenched by the addition of 100 mL of saturated NH4Cl. The mixture was poured into 200 mL of a 1/1 mixture of saturated NaCl/ethyl acetate, layers were separated, and the aqueous layer was further extracted with ethyl acetate (2×100 mL). Combined organic layers were dried over MgSO4, filtered, and concentrated, to afford 20.5 g (100%) of 11 as a viscous oil. 1H NMR δ 7.22 (t, J=8.1 Hz, 1 H), 7.05-6.90 (m, 2 H), 6.85-6.78 (m, 1 H), 4.72 (s, 2 H), 3.84 (s, 3 H), 3.78 (s, 3 H), 3.27 (d, J=22.8 Hz, 2 H). After addition The reaction was stirred for 1 h quenched by the addition of 100 mL of saturated NH4Cl The mixture was poured into 200 mL of a 1/1 mixture of saturated NaCl/ethyl acetate, layers were separated the aqueous layer was further extracted with ethyl acetate (2×100 mL) Combined organic layers were dried over MgSO4 filtered concentrated

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

Procedure: Acetone (320 ml), 75 g (450 mmol) of ethyl bromoacetate, and 40.0 g (310 mmol) of 3-chlorophenol were mixed together, then 69.8 g (505 mmol) of potassium carbonate was added. The mixture was mechanically stirred and heated to reflux for 4 h, and after cooling to room temperature, was poured into 350 mL of ethyl acetate. To this was then cautiously added 400 mL of 1M HCl, taking care to avoid excess foaming. The layers were separated and the aqueous layer was extracted with portions of ethyl acetate (3×200 mL). The combined organic layers were dried over MgSO4, filtered, concentrated, and the resulting solid was recrystallized from hexane to afford 58 g (87%) of 10 as a white solid, m.p.=39-40° C. 1H NMR δ 7.20-7.08 (m, 1 H), 6.95-6.82 (m, 2 H), 6.75-6.70 (m, 1 H), 4.53 (s, 2 H), 4.21 (q, J=7.2 Hz, 2 H), 1.23 (t, J=7.2 Hz, 3 H). heated to reflux for 4 h The layers were separated the aqueous layer was extracted with portions of ethyl acetate (3×200 mL) The combined organic layers were dried over MgSO4 filtered concentrated the resulting solid was recrystallized from hexane

Conditions: temp:-60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of n-butyl lithium (16.0 g) in hexane (160 ml) was added to a stirred solution of dimethyl methylphosphonate (26.9 g) in anhydrous tetrahydrofuran (150 ml) at -60° C. in an atmosphere of nitrogen during 20 minutes. The solution was maintained at -60° C. for a further period of 10 minutes and was then treated with a solution of ethyl 3-chlorophenoxyacetate (23.4 g) in anhydrous tetrahydrofuran (50 ml) at -60° C. during a further period of 10 minutes. This solution was stirred at -60° C. for 90 minutes and then stirred at ambient temperature for 2 hours. The solution was treated with acetic acid (21 ml) and the solvents were evaporated under reduced pressure. Water (60 ml) was added to the residue and the mixture was extracted with diethyl ether. The ethereal solution was washed with water, with aqueous sodium bicarbonate solution (10% w/v) and with water, dried over magnesium sulphate, and evaporated. The resulting residue was left to stand at ambient temperature overnight. The resulting colourless crystals were filtered off, washed with a small volume of diethyl ether, and recrystallised from a mixture of petroleum ether (b.p. 40°-60° C.) and toluene, to give dimethyl 3-(3-chlorophenoxy)-2-oxopropylphosphonate (18.6 g) in the form of colourless needles, m.p. 78°-79° C. [elemental analysis: C, 44.9; H, 5.1; P, 10.7%. C11H14ClO5P requires C, 45.1; H, 4.8; P, 10.6%. νmax 825, 865, 1030, 1160, 1270, 1335, 1600 and 1735 cm-1 ]. stirred at ambient temperature for 2 hours the solvents were evaporated under reduced pressure Water (60 ml) was added to the residue the mixture was extracted with diethyl ether The ethereal solution was washed with water, with aqueous sodium bicarbonate solution (10% w/v) and with water dried over magnesium sulphate evaporated The resulting residue was left to stand at ambient temperature overnight The resulting colourless crystals were filtered off washed with a small volume of diethyl ether recrystallised from a mixture of petroleum ether (b.p. 40°-60° C.) and toluene

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

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

Procedure: To 20.6 g (166 mmol, 238 mol %) of dimethyl methylphosphonate in 110 mL of THF at −78° C. was added dropwise 65 mL (162 mmol, 232 mol %) of a 2.5 M solution of n-BuLi in hexanes. After addition was complete, the mixture was stirred for an additional 1 h, after which 15.0 g (69.9 mmol) of aryloxyester 10 in 40 mL of THF was added dropwise. The reaction was stirred for 1 h and then quenched by the addition of 100 mL of saturated NH4Cl. The mixture was poured into 200 mL of a 1/1 mixture of saturated NaCl/ethyl acetate, layers were separated, and the aqueous layer was further extracted with ethyl acetate (2×100 mL). Combined organic layers were dried over MgSO4, filtered, and concentrated, to afford 20.5 g (100%) of 11 as a viscous oil. 1H NMR δ 7.22 (t, J=8.1 Hz, 1 H), 7.05-6.90 (m, 2 H), 6.85-6.78 (m, 1 H), 4.72 (s, 2 H), 3.84 (s, 3 H), 3.78 (s, 3 H), 3.27 (d, J=22.8 Hz, 2 H). After addition The reaction was stirred for 1 h quenched by the addition of 100 mL of saturated NH4Cl The mixture was poured into 200 mL of a 1/1 mixture of saturated NaCl/ethyl acetate, layers were separated the aqueous layer was further extracted with ethyl acetate (2×100 mL) Combined organic layers were dried over MgSO4 filtered concentrated

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

Procedure: Acetone (320 ml), 75 g (450 mmol) of ethyl bromoacetate, and 40.0 g (310 mmol) of 3-chlorophenol were mixed together, then 69.8 g (505 mmol) of potassium carbonate was added. The mixture was mechanically stirred and heated to reflux for 4 h, and after cooling to room temperature, was poured into 350 mL of ethyl acetate. To this was then cautiously added 400 mL of 1 M HCl, taking care to avoid excess foaming. The layers were separated and the aqueous layer was extracted with portions of ethyl acetate (3×200 mL). The combined organic layers were dried over MgSO4, filtered, concentrated, and the resulting solid was recrystallized from hexane to afford 58 g (87%) of 10 as a white solid, m.p.=39-40° C. 1 H NMR δ 7.20-7.08 (m, 1 H), 6.95-6.82 (m, 2 H), 6.75-6.70 (m, 1 H), 4.53 (s, 2 H), 4.21 (q, J=7.2 Hz, 2 H), 1.23 (t, J=7.2 Hz, 3 H). heated to reflux for 4 h The layers were separated the aqueous layer was extracted with portions of ethyl acetate (3×200 mL) The combined organic layers were dried over MgSO4 filtered concentrated the resulting solid was recrystallized from hexane

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

Procedure: Following Example 15 but using ethyl 3-chlorophenoxyacetate, ethyl 2-chlorophenoxyacetate or ethyl phenoxyacetate, respectively, in place of ethyl phenylacetate, the final compounds obtained were the PGE2 analogs of Example 15 wherein R (of structure IV) is 3-chlorophenoxymethyl, 2-chlorophenoxymethyl or phenoxymethyl.

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

Procedure: To 20.6 g (166 mmol, 238 mol %) of dimethyl methylphosphonate in 110 mL of THF at −78° C. was added dropwise 65 mL (162 mmol, 232 mol %) of a 2.5 M solution of n-BuLi in hexanes. After addition was complete, the mixture was stirred for an additional 1 h, after which 15.0 g (69.9 mmol) of aryloxyester 10 in 40 mL of THF was added dropwise. The reaction was stirred for 1 h and then quenched by the addition of 100 mL of saturated NH4Cl. The mixture was poured into 200 mL of a 1/1 mixture of saturated NaCl/ethyl acetate, layers were separated, and the aqueous layer was further extracted with ethyl acetate (2×100 mL). Combined organic layers were dried over MgSO4, filtered, and concentrated, to afford 20.5 g (100%) of 11 as a viscous oil. 1H NMR δ 7.22 (t, J=8.1 Hz, 1 H), 7.05-6.90 (m, 2 H), 6.85-6.78 (m, 1 H), 4.72 (s, 2 H), 3.84 (s, 3 H), 3.78 (s, 3 H), 3.27 (d, J=22.8 Hz, 2 H). After addition The reaction was stirred for 1 h quenched by the addition of 100 mL of saturated NH4Cl The mixture was poured into 200 mL of a 1/1 mixture of saturated NaCl/ethyl acetate, layers were separated the aqueous layer was further extracted with ethyl acetate (2×100 mL) Combined organic layers were dried over MgSO4 filtered concentrated

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

Procedure: Acetone (320 ml), 75 g (450 mmol) of ethyl bromoacetate, and 40.0 g (310 mmol) of 3-chlorophenol were mixed together, then 69.8 g (505 mmol) of potassium carbonate was added. The mixture was mechanically stirred and heated to reflux for 4 h, and after cooling to room temperature, was poured into 350 mL of ethyl acetate. To this was then cautiously added 400 mL of 1 M HCl, taking care to avoid excess foaming. The layers were separated and the aqueous layer was extracted with portions of ethyl acetate (3×200 mL). The combined organic layers were dried over MgSO4, filtered, concentrated, and the resulting solid was recrystallized from hexane to afford 58 g (87%) of 10 as a white solid, m.p.=39-40° C. 1H NMR δ 7.20-7.08 (m, 1 H), 6.95-6.82 (m, 2 H), 6.75-6.70 (m, 1 H), 4.53 (s, 2 H), 4.21 (q, J=7.2 Hz, 2 H), 1.23 (t, J=7.2 Hz, 3 H). heated to reflux for 4 h The layers were separated the aqueous layer was extracted with portions of ethyl acetate (3×200 mL) The combined organic layers were dried over MgSO4 filtered concentrated the resulting solid was recrystallized from hexane