[4-(Acetoxymethyl)phenyl](cyclopentyl)acetic acid → Tert-butyl(+/-)-3-(3-{[{4-[(acetyloxy)methyl]phenyl}(cyclopentyl)-acetyl]amino}-2-methylphenyl)propanoate

Participants

Reaction Steps

11.41 g (90% pure, 37.16 mmol) of (+/−)-{4-[(acetyloxy)methyl]phenyl}(cyclopentyl)acetic acid were dissolved in a mixture of 71.8 ml of DMF and 22.5 ml of pyridine, and 15.54 g (40.88 mmol) of 1-[bis(dimethylamino)methylene]-5-chloro-3-oxy-1H-benzotriazol-1-ium tetrafluoroborate and 8.75 g (37.16 mmol) of tert-butyl 3-(3-amino-2-methylphenyl)propanoate were added. The reaction mixture was stirred at RT overnight and then concentrated under high vacuum. The residue was taken up in 100 ml of ethyl acetate and washed successively with 10% strength aqueous citric acid, saturated sodium bisulfate solution and saturated sodium chloride solution. The organic phase was dried over magnesium sulfate and concentrated under reduced pressure. The crude product was purified by chromatography on silica gel (mobile phase cyclohexane/ethyl acetate 10:1→3:1). This gave 16.36 g (89.2% of theory) of the title compound.

Provenance & Evidence