反应详情

温度

130 °C

((2R)-4-(2-thiophenylsulfonyl)-1-(4-(2,2,2-trifluoro-1-hydroxy-1-methylethyl)phenyl)-2-piperazinyl)methyl methanesulfonate (100 mg, 0.189 mmol, Intermediate B) was combined with (S)-3-methylpiperazin-2-one (21.59 mg, 0.189 mmol, Fluka, St. Louis, Mo.) potassium carbonate (78 mg, 0.568 mmol, Sigma-Aldrich, St. Louis, Mo., St. Louis, Mo.) and acetonitrile (1.26 mL). This mixture was heated at 130° C. for 30 min. After the reaction was allowed to cool to room temperature, the mixture was diluted with EtOAc and the solids were removed by filtering through a 0.2 μm millipore Millex-FG filter (Millipore, Billerica, Mass.). The filtrate was concentrated and purified by silica gel chromatography (10-100% EtOAc in hexanes) and then by reverse-phase HPLC purification (Phenomenex Gemini-NX 10μ, 110 Å, AXIA packed column, 100×50 mm, 60 mL/min, 10-95% CH3CN/H2O, 0.1% TFA, 10 min gradient). The collected fractions were partitioned between CH2Cl2 and saturated aqueous NaHCO3, the organic layer was dried (Na2SO4), filtered and concentrated. The residue was taken up in MeOH and was passed through an AccuBond SPE SCX cartridge eluting with 2M ammonia/MeOH, to give (3S)-3-methyl-4-(((2S)-4-(thiophen-2-ylsulfonyl)-1-(4-(1,1,1-trifluoro-2-hydroxypropan-2-yl)phenyl)piperazin-2-yl)methyl)-2-piperazinone as a mixture of two diastereomers.

1. temperatureto cool to room temperature
2. customthe solids were removed
3. filtrationby filtering through a 0.2 μm
4. filtrationmillipore Millex-FG filter (Millipore, Billerica, Mass.)
5. concentrationThe filtrate was concentrated
6. custompurified by silica gel chromatography (10-100% EtOAc in hexanes)
7. customby reverse-phase HPLC purification (Phenomenex Gemini-NX 10μ, 110 Å, AXIA packed column, 100×50 mm, 60 mL/min, 10-95% CH3CN/H2O, 0.1% TFA, 10 min gradient)
8. customThe collected fractions were partitioned between CH2Cl2 and saturated aqueous NaHCO3
9. dry with materialthe organic layer was dried (Na2SO4)
10. filtrationfiltered
11. concentrationconcentrated
12. washeluting with 2M ammonia/MeOH