Triethylamine → (3aRS,7aRS)-7,7-diphenyl-2-[(2-fluorophenyl)acetyl]-4-perhydroisoindolone

Participants

Reaction Steps

N,N'-Carbonyldiimidazole (1.14 g) is added to a solution of 2-fluorophenylacetic acid (1.08 g) in dry dichloromethane (30 cc) cooled to +5° C. The mixture is stirred for 20 minutes at +5° C. and a solution of (3aRS,7aRS)-7,7-diphenyl-4-perhydroisoindolone hydrochloride (2.3 g) and triethylamine (1.98 cc) in dichloromethane (20 cc) is then added. The reaction mixture is stirred at 20° C. for 72 hours and then washed with water (2×150 cc), dried over magnesium sulphate and filtered and the filtrate is concentrated to dryness under reduced pressure (2.7 kPa). The solid obtained is crystallized from a mixture of acetonitrile (30 cc) and isopropyl ether (50 cc). The crystals are drained, washed with isopropyl ether and dried. (3aRS,7aRS)-7,7-diphenyl-2-[(2-fluorophenyl)acetyl]-4-perhydroisoindolone (1.53 g) is obtained in the form of white crystals melting at 186° C.

Provenance & Evidence