methyl 4-oxo-4-phenylbutanoate

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:

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

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

Procedure: To a 1.0 L round bottom flask was added 49.25 g (0.276 mol) of 3-benzoylpropionic acid. To this was added 700 mL of ACS methanol and the solution stirred until all of the acid had dissolved. To this solution was added approximately 2.0 mL of conc. H2SO4 and the reaction refluxed for 2.5 hours. The reaction can be monitored by HPLC. After the reaction was determined to be complete, the methanol was removed on the rotoevaporator and to the residual oil was added ethyl acetate (~500 mL). To the ethyl acetate layer was then added 150 mL of a saturated sodium carbonate solution. The layers were extracted and allowed to separate. The organic layer was then dried (MgSO4), filtered and concentrated to yield methyl 3-benzoylpropionate (1) as a light yellow oil. Yield 53.30 g; yield 100%; >97% cp. Lt bp 172-174° C. at 10 mm Hg.; 1H NMR ppm (δ), CDCl3, 7.98 (dd, 2H), 7.54 (m, 1H), 7.45(m, 2H), 3.70 (s, 3H, OCH3), 3.32 (t, 2H), 2.76 (t, 2H). 13C NMR ppm (δ), CDCl3 198.0 (C=O), 173.3 (CO2), 136.5 (q), 133.2, 128.6, 128.0, 51.7 (OCH3), 33.3, 28.0. IR oil cm-1 2952, 1737, 1687, 1596, 1449, 1358, 1221, 1168, 1001, 750, 691. had dissolved the reaction refluxed for 2.5 hours The reaction the methanol was removed on the rotoevaporator and to the residual oil was added ethyl acetate (~500 mL) To the ethyl acetate layer was then added 150 mL of a saturated sodium carbonate solution The layers were extracted to separate The organic layer was then dried (MgSO4) filtered concentrated

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

Procedure: After a mixture of 4-(5-methyl-2-phenyl-4-oxazolylmethoxy)benzyloxyamine (1.00 g), methyl 4-oxo-4-phenylbutyrate (619 mg), acetic acid (0.553 ml), sodium acetate (528 mg) and methanol (20 ml) was heated to reflux for 19 hours, the mixture was cooled to room temperature. Water was added to the reaction mixture and extracted with ethyl acetate. The ethyl acetate layer was washed with an aqueous saturated solution of sodium chloride, dried (MgSO4) and concentrated. The residue was subjected to silica gel chromatography to obtain methyl E-4-[4-(5-methyl-2-phenyl-4-oxazolylmethoxy)benzyloxyimino]-4-phenylbutyrate (1.18 g, yield 76%) as a colorless oil from an ethyl acetate-hexane (2:9, v/v)-eluted fraction. was heated to reflux for 19 hours extracted with ethyl acetate The ethyl acetate layer was washed with an aqueous saturated solution of sodium chloride dried (MgSO4) concentrated

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

Procedure: After a mixture of 3-(5-methyl-2-phenyl-4-oxazolylmethoxy)benzyloxyamine (600 mg), methyl 4-oxo-4-phenylbutyrate (371 mg), acetic acid (0.331 ml), sodium acetate (317 mg) and methanol (20 ml) was heated to reflux for 40 hours, the mixture was cooled to room temperature. Water was added to the reaction mixture and extracted with ethyl acetate. The ethyl acetate layer was washed with an aqueous saturated solution of sodium chloride, dried (MgSO4) and concentrated. The residue was subjected to silica gel chromatography to obtain methyl E-4-[3-(5-methyl-2-phenyl-4-oxazolylmethoxy)benzyloxyimino]-4-phenylbutyrate (570 mg, yield 61%) as a colorless oil from an ethyl acetate-hexane (1:4, v/v)-eluted fraction. was heated to reflux for 40 hours extracted with ethyl acetate The ethyl acetate layer was washed with an aqueous saturated solution of sodium chloride dried (MgSO4) concentrated

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

Procedure: After a mixture of 3-(5-methyl-2-phenyl-4-oxazolylmethoxy)benzyloxyamine (600 mg), methyl 4-oxo-4-phenylbutyrate (371 mg), acetic acid (0.331 ml), sodium acetate (317 mg) and methanol (20 ml) was heated to reflux for 40 hours, the mixture was cooled to room temperature. Water was added to the reaction mixture and extracted with ethyl acetate. The ethyl acetate layer was washed with an aqueous saturated solution of sodium chloride, dried (MgSO4) and concentrated. The residue was subjected to silica gel chromatography to obtain methyl E-4-[3-(5-methyl-2-phenyl-4-oxazolylmethoxy)benzyloxyimino]-4-phenylbutyrate (570 mg, yield 61%) as a colorless oil from an ethyl acetate-hexane (1:4, v/v)-eluted fraction. was heated to reflux for 40 hours extracted with ethyl acetate The ethyl acetate layer was washed with an aqueous saturated solution of sodium chloride dried (MgSO4) concentrated

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

Procedure: A mixture of 4-methoxymethoxybenzyloxyamine (4.99 g), methyl 4-oxo-4-phenylbutyrate (5.71 g), acetic acid (5.10 ml), sodium acetate (4.87 g) and methanol (200 ml) was heated under reflux for 15 hours. The reaction mixture was cooled to room temperature, dilute hydrochloric acid was added to the residue and extracted with ethyl acetate. The ethyl acetate layer was washed with an aqueous saturated solution of sodium chloride, dried (MgSO4) and concentrated. The residue was dissolved in tetrahydrofuran (50 ml) and methanol (5 ml). To this solution was added 1N hydrochloric acid (10 ml) and heated under reflux for 3 hours. The reaction mixture was cooled to room temperature, water was added and extracted with ethyl acetate. The ethyl acetate layer was washed with an aqueous saturated solution of sodium chloride, dried (MgSO4) and concentrated. The residue was subjected to silica gel chromatography to obtain methyl E-4-(4-hydroxybenzyloxyimino)-4-phenylbutyrate (4.24 g, yield 50%) as a colorless oil from an ethyl acetate-hexane (2:5, v/v)-eluted fraction. was heated under reflux for 15 hours extracted with ethyl acetate The ethyl acetate layer was washed with an aqueous saturated solution of sodium chloride dried (MgSO4) concentrated The residue was dissolved in tetrahydrofuran (50 ml) To this solution was added 1N hydrochloric acid (10 ml) heated under reflux for 3 hours The reaction mixture was cooled to room temperature water was added extracted with ethyl acetate The ethyl acetate layer was washed with an aqueous saturated solution of sodium chloride dried (MgSO4) concentrated

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

Procedure: A mixture of 4-methoxymethoxybenzyloxyamine (4.99 g), methyl 4-oxo-4-phenylbutyrate (5.71 g), acetic acid (5.10 ml), sodium acetate (4.87 g) and methanol (200 ml) was heated under reflux for 15 hours. The reaction mixture was cooled to room temperature, dilute hydrochloric acid was added to the residue and extracted with ethyl acetate. The ethyl acetate layer was washed with an aqueous saturated solution of sodium chloride, dried (MgSO4) and concentrated. The residue was dissolved in tetrahydrofuran (50 ml) and methanol (5 ml). To this solution was added 1N hydrochloric acid (10 ml) and heated under reflux for 3 hours. The reaction mixture was cooled to room temperature, water was added and extracted with ethyl acetate. The ethyl acetate layer was washed with an aqueous saturated solution of sodium chloride, dried (MgSO4) and concentrated. The residue was subjected to silica gel chromatography to obtain methyl E-4-(4-hydroxybenzyloxyimino)-4-phenylbutyrate (4.24 g, yield 50%) as a colorless oil from an ethyl acetate-hexane (2:5, v/v)-eluted fraction. was heated under reflux for 15 hours extracted with ethyl acetate The ethyl acetate layer was washed with an aqueous saturated solution of sodium chloride dried (MgSO4) concentrated The residue was dissolved in tetrahydrofuran (50 ml) To this solution was added 1N hydrochloric acid (10 ml) heated under reflux for 3 hours The reaction mixture was cooled to room temperature water was added extracted with ethyl acetate The ethyl acetate layer was washed with an aqueous saturated solution of sodium chloride dried (MgSO4) concentrated

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

Procedure: A mixture of methyl 3-benzoylpropionate (15.0 g), hydroxylamine hydrochloride (6.50 g), sodium acetate (9.60 g) and methanol (150 ml) was heated under reflux for 8 hours. The reaction mixture was concentrated, and the residue was diluted with water and extracted with ethyl acetate. The ethyl acetate layer was washed with water, dried (MgSO4), and then concentrated. The residue was subjected to column chromatography on silica gel, and methyl E-4-hydroxyimino-4-phenylbutyrate (14.7 g, yield 91%) was obtained as an oil from a fraction eluted with ethyl acetate-hexane (1:3, v/v). was heated under reflux for 8 hours The reaction mixture was concentrated the residue was diluted with water extracted with ethyl acetate The ethyl acetate layer was washed with water dried (MgSO4) concentrated