Diisopropylethylamine → HCID 54172469, compound

Participants

Reaction Conditions

Reaction Steps

N-tert-Butoxycarbonyl-L-leucine monohydrate (4.32 g, 17.3 mmol, Bachem Inc., Torrance, Calif.) was dissolved in dry DMF (33 mL) under nitrogen atmosphere and cooled to 0° C. in an ice-water bath. To this solution were added, in succession, N,N-diisopropylethylamine (6.04 mL, 34.7 mmol) and solid -benzotriazol-1-yl-N,N,N′,N′-tetramethyluronium hexafluorophosphate (6.58 g, 17.4 mmol). The resulting reaction mixture was stirred at that temperature for 35 minutes; solid 1-bis(4-fluorophenyl)methyl piperazine (5.00 g, 17.3 mmol) was then added. After stirring for, sequentially, 15 minutes at 0° C. and 30 minutes at ambient temperature, reaction mixture was mixed with 120 mL of diethyl ether; the resulting mixture was successively washed with saturated aqueous NaHCO3 solution (2×120 mL), brine (2×120 mL), and was dried over Na2SO4. The solution was concentrated in vacuo affording a viscous oil. The crude product was further purified by flash chromatography (30% EtOAc in hexanes) to provide 8.23 g (94%) of the pure titled compound as a off-white foam: mp 59-66° C. APCI-MS m/z 502.4 (MH+).

Provenance & Evidence