Phenylacetyl chloride → (3aR,7aR)-7,7-Diphenyl-2-(phenylacetyl)perhydro-4-isoindolone

Participants

Reaction Steps

A solution of phenylacetyl chloride (4 cc) and triethylamine (8.6 cc) in dichloromethane (10 cc) is added dropwise to a solution of (3aR,7aR)-7,7-diphenyl-4-perhydroisoindolone hydrochloride (10 g) in dry dichloromethane (80 cc) cooled to +5° C. The reaction mixture is stirred for 2 hours at +5° C. and then for 20 hours at 20° C. The reaction mixture is treated with a saturated aqueous solution (30 cc) of sodium bicarbonate; the organic phase is washed with distilled water (2 * 50 cc), dried over magnesium sulphate and filtered and the filtrate is concentrated to dryness under reduced pressure (2.7 kPa). The residue is crystallized from acetonitrile (15 cc). The crystals are drained, washed with acetonitrile (10 cc) and with isopropyl ether (10 cc) and dried. (3aR,7aR)-7,7-diphenyl-2-(phenylacetyl)-4-perhydroisoindolone (5.7 g) melting at 173° C. is obtained; [a]D20 =-282° (c=1, methanol).

Provenance & Evidence