3-methyl-3H-2-benzofuran-1-one

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: 100.96 g of 2-acetylbenzoic acid (3-1) was dissolved in 500 ml of aqueous solution of 41.37 g of potassium hydroxide, to which 20.35 g of sodium boron hydride was added little by little at a room temperature. The resulting mixture was stirred at a room temperature for 2 days, and thereafter, the resulting mixture was adjusted to pH 1 with concentrated hydrochloric acid and extracted with chloroform. The resulting organic layer was dried over anhydrous sodium sulfate, and thereafter, the solvent was distilled off under reduced pressure. The resulting residue was purified by distilling under reduced pressure (117-121° C./3-5 mmHg) to obtain 86.45 g of 3-methylphthalide (3-2). was added little by little at a room temperature extracted with chloroform The resulting organic layer was dried over anhydrous sodium sulfate the solvent was distilled off under reduced pressure The resulting residue was purified by distilling under reduced pressure (117-121° C./3-5 mmHg)

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a solution of oxindole (119 mg, 0.891 mmol) in THF (2.0 ml) cooled at 0° C. was added 1.0M LiHMDS/THF (1.78 ml). The mixture was stirred for 4 minutes at 0° C., then allowed to warm to room temperature for an additional 6 minutes. A solution of 3-methyl-2-benzofuran-1(3 H)-one (119 mg, 0.802 mmol) in THF (0.5 ml) was added, and the reaction was rapidly stirred for 1.5 hours. The reaction was quenched into 10% HCl aqueous solution (30 ml). The resulting mixture was stirred 5 minutes, and then extracted into EtOAc. The combined organic layers were washed with water, brine, dried with anhydrous Na2SO4, and rotary evaporated to a yellow oil. Upon standing at room temperature overnight a yellow crystalline solid formed from the yellow oil. The remaining oil was removed by pipet and the solid was recrystallized from EtOAc to produce (3E)-3-(3-methyl-2-benzofuran-1(3 H)-ylidene)-1,3-dihydro-2H-indol-2-one as a yellow solid (32 mg, 15%). to warm to room temperature for an additional 6 minutes the reaction was rapidly stirred for 1.5 hours The reaction was quenched into 10% HCl aqueous solution (30 ml) The resulting mixture was stirred 5 minutes extracted into EtOAc The combined organic layers were washed with water, brine dried with anhydrous Na2SO4 rotary evaporated to a yellow oil Upon standing at room temperature overnight a yellow crystalline solid formed from the yellow oil The remaining oil was removed by pipet the solid was recrystallized from EtOAc

反応条件: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a solution of 2-bromobenzoic acid (0.50 g, 2.49 mmol) in THF (12.0 ml) cooled at −78° C. was added 2.5M n-BuLi in hexane (2.0 ml). After stirring for 25 minutes, a solution of acetaldehyde (0.142 g, 3.23 mmol) in THF (0.3 ml) was added. The reaction was allowed to warm to room temperature after 8 minutes at −78° C., and then quenched into 10% HCl aqueous solution (30 ml). The acidic solution was rapidly stirred for 1.5 hours, and then extracted with EtOAc. The combined organic layers were washed with saturated NaHCO3 aqueous solution, brine, dried with anhydrous Na2SO4, and rotary evaporated to an oily residue. Gradient chromatography of the oil residue through a silica gel column with 20% to 30% EtOAc in hexane afforded 3-methyl-2-benzofuran-1(3 H)-one as a clear oil (130 mg, 35%). quenched into 10% HCl aqueous solution (30 ml) The acidic solution was rapidly stirred for 1.5 hours extracted with EtOAc The combined organic layers were washed with saturated NaHCO3 aqueous solution, brine dried with anhydrous Na2SO4 rotary evaporated to an oily residue

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: 100.96 g of 2-acetylbenzoic acid (3-1) was dissolved in 500 ml of aqueous solution of 41.37 g of potassium hydroxide, to which 20.35 g of sodium boron hydride was added little by little at a room temperature. The resulting mixture was stirred at a room temperature for 2 days, and thereafter, the resulting mixture was adjusted to pH 1 with concentrated hydrochloric acid and extracted with chloroform. The resulting organic layer was dried over anhydrous sodium sulfate, and thereafter, the solvent was distilled off under reduced pressure. The resulting residue was purified by distilling under reduced pressure (117-121° C./3-5 mmHg) to obtain 86.45 g of 3-methylphthalide (3-2). was added little by little at a room temperature extracted with chloroform The resulting organic layer was dried over anhydrous sodium sulfate the solvent was distilled off under reduced pressure The resulting residue was purified by distilling under reduced pressure (117-121° C./3-5 mmHg)