Triethylamine → tert-Butyl [(3S)-3-(ethoxymethyl)-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]carbamate

Participants

Reaction Steps

(1S)-3-[(tert-Butoxycarbonyl)amino]-1-(ethoxymethyl)cyclopentanecarboxylic acid (429.4 mg, 1.494 mmol) , 1-[4-(trifluoromethyl)pyridin-2-yl]piperazine dihydrochloride (500.0 mg, 1.644 mmol) , triethylamine (0.833 mL, 5.98 mmol) and O-(benzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (850.3 mg, 2.242 mmol) (HBTU) were mixed in dry DMF (10.2 mL). The resulting brown solution was stirred at room temperature under N2 overnight. The reaction mixture was diluted with CH2Cl2 and washed with saturated Na2CO3. The aqueous layer was extracted with CH2Cl2 four times. The combined organic layers were dried (MgSO4), concentrated and purified by flash chromatography to provide the desired product (304.4 mg, 40%). MS calculated for C24H36F3N4O4:(M+H) 501.3; found 501.3.

Provenance & Evidence