N-phenylhydroxylamine

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:

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

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

Procedure: To a stirring solution of 4-(4-phenylbutyl)benzoic acid (prepared as described in Example 173) (370 mg, 1.45 mmol) in 10 ml of dry benzene under argon, was added oxalyl chloride (0.14 ml, 2.0 eq.). To this solution was added DMF dropwise in 10 minute intervals, until no gas was evolved and the solution turned slightly cloudy (2 drops). The mixture was stirred for 1 hour, then reduced on the rotovap without heating. The crude product was dissolved in 5 ml of THF and added dropwise to a 0° C. solution of N-phenyl hydroxylamine (317 mg, 2.0 eq.) in 20 ml of THF:H2O (1:1) with triethylamine (0.41 ml, 2.0 eq.). The solution was stirred for 1 hour at 0° C., then allowed to warm to room temperature and stir overnight. The reaction mixture was diluted with EtOAc and the organic layer was washed with H2O, 1N HCl (2×), and brine, then dried over anhydrous MgSO4. Concentration in vacuo gave a white solid which was triturated with hexane to remove a yellow impurity and recrystallized from hot hexane/EtOAc, to give title product, 256 mg (51%). without heating The solution was stirred for 1 hour at 0° C. stir overnight the organic layer was washed with H2O, 1N HCl (2×), and brine dried over anhydrous MgSO4 Concentration in vacuo gave a white solid which was triturated with hexane to remove a yellow impurity recrystallized from hot hexane/EtOAc

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

Procedure: To a stirring solution of 3-phenylpropylcarboxylic acid (500 mg, 3.1 mmol) in 10 ml of dry benzene under argon was added oxalyl chloride (0.30 ml, 1.1 eq.). To this solution was added dimethylformamide dropwise in 10 minute intervals, until no gas was evolved and the solution turned slightly cloudy (2 drops). The mixture was stirred for 1 hour then reduced on the rotovap without heating. The crude product was diluted with 5 ml of tetrahydropyran and added dropwise to a 0° C. solution of N-phenylhydroxylamine (666 mg, 2 eq.) in 20 ml of THF:H2O (1:1) with triethylamine (0.85 ml, 2.0 eq.). The solution was stirred for 1 hour at 0° C. then allowed to warm to room temperature and stir overnight. The reaction mixture was diluted with EtOAc and the organic layer was washed with H2O, 1N HCl (2X), and brine, then dried over anhydrous MgSO4. Concentration in vacuo gave a white solid which was recrystallized from hot hexane/EtOAc, to give title product (451 mg, 58%) as a flat golden crystalline solid. without heating The solution was stirred for 1 hour at 0° C. stir overnight the organic layer was washed with H2O, 1N HCl (2X), and brine dried over anhydrous MgSO4 Concentration in vacuo gave a white solid which was recrystallized from hot hexane/EtOAc

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

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

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