ethyl 8-oxo-8-phenyloctanoate

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

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 (1.50 g), ethyl 8-oxo-8-phenyloctanoate (2.54 g), acetic acid (0.830 ml), sodium acetate (793 mg) and ethanol (40 ml) was heated to reflux for 18 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 ethyl E-8-[4-(5-methyl-2-phenyl-4-oxazolylmethoxy)benzyloxyimino]-8-phenyloctanoate (2.02 g, yield 76%) as a colorless oil from an ethyl acetate-hexane (1:5, v/v)-eluted fraction. was heated to reflux for 18 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-(tert-butyldimethylsilyloxy)benzyloxyamine (3.10 g), ethyl 8-oxo-8-phenyloctanoate (6.32 g), acetic acid (2.07 ml), sodium acetate (1.98 g) and ethanol (80 ml) was heated under reflux for 20 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 dissolved in tetrahydrofuran (60 ml), tetrabutylammonium fluoride trihydrate (3.98 g) was added and stirred at room temperature for 1 hour. 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 ethyl E-8-(4-hydroxybenzyloxyimino)-8-phenyloctanoate (3.55 g, yield 77%) as a colorless oil from an ethyl acetate-hexane (2:7, v/v)-eluted fraction. was heated under reflux for 20 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 (60 ml) tetrabutylammonium fluoride trihydrate (3.98 g) was added Water was added to the reaction mixture 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 4-(5-methyl-2-phenyl-4-oxazolylmethoxy)benzyloxyamine (1.50 g), ethyl 8-oxo-8-phenyloctanoate (2.54 g), acetic acid (0.830 ml), sodium acetate (793 mg) and ethanol (40 ml) was heated to reflux for 18 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 ethyl E-8-[4-(5-methyl-2-phenyl-4-oxazolylmethoxy)benzyloxyimino]-8-phenyloctanoate (2.02 g, yield 76%) as a colorless oil from an ethyl acetate-hexane (1:5, v/v)-eluted fraction. was heated to reflux for 18 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 4-(5-methyl-2-phenyl-4-oxazolylmethoxy)benzyloxyamine (1.50 g), ethyl 8-oxo-8-phenyloctanoate (2.54 g), acetic acid (0.830 ml), sodium acetate (793 mg) and ethanol (40 ml) was heated to reflux for 18 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 ethyl E-8-[4-(5-methyl-2-phenyl-4-oxazolylmethoxy)benzyloxyimino]-8-phenyloctanoate (2.02 g, yield 76%) as a colorless oil from an ethyl acetate-hexane (1:5, v/v)-eluted fraction. was heated to reflux for 18 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-(tert-butyldimethylsilyloxy)benzyloxyamine (3.10 g), ethyl 8-oxo-8-phenyloctanoate (6.32 g), acetic acid (2.07 ml), sodium acetate (1.98 g) and ethanol (80 ml) was heated under reflux for 20 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 dissolved in tetrahydrofuran (60 ml), tetrabutylammonium fluoride trihydrate (3.98 g) was added and stirred at room temperature for 1 hour. 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 ethyl E-8-(4-hydroxybenzyloxyimino)-8-phenyloctanoate (3.55 g, yield 77%) as a colorless oil from an ethyl acetate-hexane (2:7, v/v)-eluted fraction. was heated under reflux for 20 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 (60 ml) tetrabutylammonium fluoride trihydrate (3.98 g) was added Water was added to the reaction mixture 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:

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 (1.50 g), ethyl 8-oxo-8-phenyloctanoate (2.54 g), acetic acid (0.830 ml), sodium acetate (793 mg) and ethanol (40 ml) was heated to reflux for 18 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 ethyl E-8-[4-(5-methyl-2-phenyl-4-oxazolylmethoxy)benzyloxyimino]-8-phenyloctanoate (2.02 g, yield 76%) as a colorless oil from an ethyl acetate-hexane (1:5, v/v)-eluted fraction. was heated to reflux for 18 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-(tert-butyldimethylsilyloxy)benzyloxyamine (3.10 g), ethyl 8-oxo-8-phenyloctanoate (6.32 g), acetic acid (2.07 ml), sodium acetate (1.98 g) and ethanol (80 ml) was heated under reflux for 20 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 dissolved in tetrahydrofuran (60 ml), tetrabutylammonium fluoride trihydrate (3.98 g) was added and stirred at room temperature for 1 hour. 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 ethyl E-8-(4-hydroxybenzyloxyimino)-8-phenyloctanoate (3.55 g, yield 77%) as a colorless oil from an ethyl acetate-hexane (2:7, v/v)-eluted fraction. was heated under reflux for 20 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 (60 ml) tetrabutylammonium fluoride trihydrate (3.98 g) was added Water was added to the reaction mixture 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-(tert-butyldimethylsilyloxy)benzyloxyamine (3.10 g), ethyl 8-oxo-8-phenyloctanoate (6.32 g), acetic acid (2.07 ml), sodium acetate (1.98 g) and ethanol (80 ml) was heated under reflux for 20 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 dissolved in tetrahydrofuran (60 ml), tetrabutylammonium fluoride trihydrate (3.98 g) was added and stirred at room temperature for 1 hour. 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 ethyl E-8-(4-hydroxybenzyloxyimino)-8-phenyloctanoate (3.55 g, yield 77%) as a colorless oil from an ethyl acetate-hexane (2:7, v/v)-eluted fraction. was heated under reflux for 20 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 (60 ml) tetrabutylammonium fluoride trihydrate (3.98 g) was added Water was added to the reaction mixture 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-(tert-butyldimethylsilyloxy)benzyloxyamine (3.10 g), ethyl 8-oxo-8-phenyloctanoate (6.32 g), acetic acid (2.07 ml), sodium acetate (1.98 g) and ethanol (80 ml) was heated under reflux for 20 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 dissolved in tetrahydrofuran (60 ml), tetrabutylammonium fluoride trihydrate (3.98 g) was added and stirred at room temperature for 1 hour. 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 ethyl E-8-(4-hydroxybenzyloxyimino)-8-phenyloctanoate (3.55 g, yield 77%) as a colorless oil from an ethyl acetate-hexane (2:7, v/v)-eluted fraction. was heated under reflux for 20 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 (60 ml) tetrabutylammonium fluoride trihydrate (3.98 g) was added Water was added to the reaction mixture 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: Following the procedure described in Example 18, step 1, 2, but substituting respectively 3-bromobenzoyl chloride for benzoyl chloride, the resulting ester was substituted for 49d in Example 67, step 1. Then, following the procedure described in Example 18, step 3, but substituting the final ester for ester 49a, the resulting acid was substituted in Example 14, step 3, using 1.1 equivalent of NH2OH.HCl and triethylamine each, to afford the title compound 131 in 35% yield. 1H NMR (300 MHz, CDCl3): δ 8.13 (s, 1H), 7.88-7.30 (m, 8H), 2.96 (br t, 2H), 2.17 (m, 2H), 1.77-1.58 (m, 4H), 1.35 (m, 4H). 13C NMR (75 MHz, CDCl3) δ623.93, 25.12, 28.71(2), 32.73, 38.48, 126.61, 126.88, 127.08, 127.72, 128.85, 128.99, 131.58, 137.30, 140.06, 141.57, 171.82, 200.75.