Triethylamine → HCID 67915998, compound

Participants

Reaction Steps

N,N'-Carbonyldiimidazole (3.6 g) is added to a solution of (cyclohexa-1,4-dien-1-yl)acetic acid (2.35 g) in dry dichloromethane (50 cc), cooled to +5° C. The mixture is stirred for 30 minutes at +5° C. and a solution of 7,7-diphenyl-4-perhydroisoindolone hydrochloride (6.55 g) and triethylamine (5.6 cc) in dichloromethane (30 cc) is then added. The reaction mixture is stirred for 1 hour at +5° C. and then for 16 hours at 20° C. and is washed with normal hydrochloric acid (150 cc) and an aqueous saturated sodium chloride solution (150 cc). The organic phase is dried over magnesium sulphate and filtered and the filtrate is concentrated to dryness under reduced pressure (2.7 kPa). The residue is chromatographed on a silica gel column (particle size 0.2-0.063 mm, diameter 6 cm, height 30 cm), eluting under a nitrogen pressure of 0.5 bar with a mixture (3 liters) of cyclohexane and ethyl acetate (50/50) and then with ethyl acetate (2 liters) and collecting 100 cc fractions. Fractions 10 to 48 are combined and concentrated to dryness under reduced pressure (2.7 kPa). The residue is recrystallized from acetonitrile (15 cc). The crystals are drained, washed with acetonitrile (5 cc) and isopropyl ether (25 cc) and dried. (3aRS,7aRS)-2-(cyclohexa-1,4-dien-1-yl)-acetyl-7,7-diphenyl-4-perhydroisoindolone (5.7 g) is obtained. m.p.=186° C.

Provenance & Evidence