Phthalaldehyde → 2-(2R)-(4-Chlorobiphenylsulfonylamino)-5-(1-oxo-1,3-dihydro-isoindol-2-yl) pentanoic acid

Participants

Reaction Conditions

Reaction Steps

0.32 g (0.76 mmol) of 2-(2R)-(4-chlorobiphenylsulfonylamino)-5-amino-pentanoic acid hydrochloride is dissolved in 30 ml of glacial acetic acid with 0.186 g (1.35 mmol) of phthalaldehyde and stirred at 100° C. for 3 hours. The solution is cooled to 0° C., and the precipitate which is deposited is filtered off with suction and chromatographed on a silica gel column (eluent: ethyl acetate/petroleum ether/glacial acetic acid 10/10/2).

Provenance & Evidence