Diisopropylethylamine → (+/-)-Tert-butyl 1-[3-({cyclopentyl[4-(trifluoromethyl)phenyl]acetyl}-amino)benzyl]cyclopropanecarboxylate

Participants

Reaction Conditions

Reaction Steps

3.0 g (11.02 mmol) of (+/−)-cyclopentyl[4-(trifluoromethyl)phenyl]acetic acid were dissolved in 16.0 ml of DMF, and 1.79 g (13.22 mmol) of 1-hydroxy-1H-benzotriazole hydrate were added. The mixture was cooled to 0° C., and 3.8 ml (22.04 mmol) of N,N-diisopropylethylamine and 3.41 g (13.77 mmol) of tert-butyl 1-(3-aminobenzyl)cyclopropanecarboxylate, dissolved in a little DMF, were added. 5.03 g (13.22 mmol) of HATU were then added in several portions, and the reaction mixture was slowly warmed to RT and then stirred at RT for 3 h. The reaction was then added to water. After phase separation, the aqueous phase was extracted three times with ethyl acetate, and the combined organic phases were washed with saturated sodium chloride solution, dried over magnesium sulphate and concentrated under reduced pressure. The crude product was purified by chromatography on silica gel (mobile phase cyclohexane/ethyl acetate 20:1→10:1). This gave 4.89 g of the target compound (88.5% of theory).

Provenance & Evidence