反应详情

温度

0 °C

(S)-4-Methyl-2-[methyl-(tetrahydro-pyran-4-yl)-amino]-pentanoic acid (0.200 g, 0.873 mmol, Example 27, Step A) was dissolved in dry DMF (4 mL) under nitrogen atmosphere and cooled to 0° C. in an ice-water bath. To this solution were added, in succession, N,N,-diisopropylethylamine (0.304 mL, 1.75 mmol) and solid O-benzotriazol-1-yl-N,N,N′,N′-tetramethyluronium hexafluorophosphate (0.331 g, 0.873 mmol). The resulting reaction mixture was stirred at that temperature for 30 minutes; solid 1-bis(4-fluorophenyl)methyl piperazine (0.252 g, 0.873 mmol) was then added. After stirring for, sequentially, 15 minutes at 0° C. and 40 minutes at ambient temperature, reaction mixture was mixed with 50 mL of diethyl ether; the resulting mixture was successively washed with saturated aqueous NaHCO3 solution (2×60 mL), brine (2×60 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 (50% EtOAc in hexane) to provide 0.326 g (75%) of the pure titled compound as a white foam: mp 56-65° C. APCI-MS m/z 500.3 (MH+).

1. customThe resulting reaction mixture
2. stirringAfter stirring for, sequentially, 15 minutes at 0° C.
3. custom40 minutes at ambient temperature, reaction mixture
4. washthe resulting mixture was successively washed with saturated aqueous NaHCO3 solution (2×60 mL), brine (2×60 mL)
5. dry with materialwas dried over Na2SO4
6. concentrationThe solution was concentrated in vacuo
7. customaffording a viscous oil
8. customThe crude product was further purified by flash chromatography (50% EtOAc in hexane)