Triethylamine → (3aRS,7aRS)-7,7-diphenyl-2-[(2,5-dimethoxyphenyl)acetyl]-4-perhydroisoindolone

Beteiligte Stoffe

Reaktionsschritte

N,N'-Carbonyldiimidazole (1.14 g) is added to a solution of 2,5-dimethoxyphenylacetic acid (1.34 g) in dry dichloromethane (30 cc), cooled to +5° C. The mixture is stirred for 30 minutes at +5° C. and a solution of (3aRS,7aRS)-7,7-diphenyl-4-perhydroisoindolone hydrochloride (2.28 g) and triethylamine (1.96 cc) in dichloromethane (20 cc) is then added. The reaction mixture is stirred at 20° C. for 16 hours, then washed with water (2×200 cc), dried over magnesium sulphate and filtered and the filtrate is concentrated to dryness under reduced pressure (2.7 kPa). The meringue obtained is crystallized from a mixture of acetonitrile (20 cc) and isopropyl ether (80 cc). The crystals are drained, washed with isopropyl ether (25 cc) and dried. (3aRS,7aRS)-7,7-diphenyl-2-[(2,5-dimethoxyphenyl)acetyl]-4-perhydroisoindolone (1.5 g) is obtained in the form of white crystals melting at 209° C.

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