反应详情

温度

25 °C

2-(R)-(3-Chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid (prepared as in PCT WO 2004/052869 A1, Example 1, 825 mg, 2.50 mmol) was suspended in methylene chloride (12.5 mL) and a 2.0 M solution of oxalyl chloride in methylene chloride (1.25 mL, 2.5 mmol) was added and the reaction stirred at 25° C. for 10 min. The solution was chilled to 0° C. and 2,6-lutidine (582 μL, 5.00 mmol) was added. The reaction continued to stir at 0° C. for 10 min. 4-(3-Amino-pyrazol-1-yl)-2-methyl-butan-2-ol (424 mg, 2.50 mmol) was dissolved in methylene chloride (5 mL) and added dropwise to the reaction. The reaction continued to stir at 0° C. for 10 min. The reaction was diluted with methylene chloride (50 mL), washed with water (15 mL), saturated aqueous brine solution (10 mL), 1.0 M aqueous hydrochloric acid solution (10 mL), dried over magnesium sulfate and concentrated in vacuo to give a yellow oil. Purification by flash column chromatography (Merck silica gel 60, 40-63 μm; 35% ethyl acetate/methylene chloride) afforded 2-(R)-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-[1-(3-hydroxy-3-methyl-butyl)-1H-pyrazol-3-yl]-propionamide (653 mg, 54%) as a white foamy solid: ESI-LRMS m/e calcd for C23H32ClN3O4S [M+] 481.18, found 482.35 [M+H+], 464.22 [M−H2O+H+]; 1H NMR (400 MHz, CDCl3) δ ppm 1.09-1.23 (m, 2H, CH2), 1.29 (s, 6H, 2×CH3), 1.46-1.94 (m, 8H, 4×CH2), 1.94-2.04 (m, 2 H, CH2), 2.18-2.29 (m, 1H, CH), 3.28 (s, 3H, SO2CH3), 3.55 (t, J=7.5 Hz, 1H, CH), 3.00-4.25 (m, 2H, NCH2), 6.65 (d, J=2.3 Hz, 1H, Ar), 7.29 (d, J=2.3 Hz, 1H, Ar), 7.47 (dd, Jo=8.2, Jm=1.7 Hz. 1H, Ar), 7.61 (d, Jm=1.7 Hz, 1H, Ar), 8.10 (d, Jo=8.2 Hz, 1H, Ar), 8.12 (s, 1H, NH).

1. temperatureThe solution was chilled to 0° C.
2. stirringto stir at 0° C. for 10 min
3. additionadded dropwise to the reaction
4. stirringto stir at 0° C. for 10 min
5. washwashed with water (15 mL), saturated aqueous brine solution (10 mL), 1.0 M aqueous hydrochloric acid solution (10 mL)
6. dry with materialdried over magnesium sulfate
7. concentrationconcentrated in vacuo
8. customto give a yellow oil
9. customPurification by flash column chromatography (Merck silica gel 60, 40-63 μm; 35% ethyl acetate/methylene chloride)