反应详情

温度

25 °C

In a round bottom flask was placed (R)-2-(3-cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid (prepared in Example 114, 65 mg, 0.20 mmol), methylene chloride (2 mL) and N,N-dimethylformamide (2 drops). To this solution was then added a solution of oxalyl chloride in methylene chloride (2.0 M solution, 110 μL, 0.22 mmol). Upon addition there was gas evolution. This was stirred for 30 min at 25° C. after which time it was concentrated in vacuo. The residue was then dissolved in methylene chloride (2 mL) and added dropwise into a solution of 1-(2-methoxy-ethyl)-1H-pyrazol-3-ylamine (prepared in Example 72, 29 mg, 0.20 mmol), 2,6-lutidine (46 μL, 0.40 mmol) and methylene chloride (2 mL) at 0° C. It was then allowed to warm to 25° C. and stirred for 1 h. After this time, the reaction was quenched with a small amount of methanol, diluted with methylene chloride and then concentrated with silica gel (2 g) in vacuo and purified on Biotage Flash chromatography system (40S column, silica gel, 50% ethyl acetate/hexanes to 80% ethyl acetate/hexanes) to afford (R)-2-(3-cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-[1-(2-methoxy-ethyl)-1H-pyrazol-3-yl]-propionamide (67 mg, 75%) as a colorless gum: [α]25589=−9.4° (c=0.16, methanol); ES-HRMS m/e calcd for C22H28N4O4S (M+H)+ 445.1904, observed 445.1904; 1H NMR (300 MHz, DMSO-d6) δ 1.12 (m, 2H, CH2), 1.38-1.80 (m, 8H, 4×CH2), 2.12 (m, 1H, CH), 3.19 (s, 3H, OCH3), 3.36 (s, 3H, SO2CH3), 3.61 (t, J=5.3 Hz, 2 H, OCH2), 3.89 (m, 1H, ArCHCO), 4.12 (t, J=5.3 Hz, 2H, NCH2), 6.41 (d, J=2.2 Hz, 1H, Ar), 7.55 (d, J=2.2 Hz, 1H, Ar), 7.95 (dd, Jm=1.6 Hz, Jo=8.2 Hz, 1H, Ar), 8.11 (d, Jm=1.6 Hz, 1H, Ar), 8.11 (d, Jo=8.2 Hz, 1H, Ar), 10.84 (s, 1H, NH).

1. customIn a round bottom flask was placed
2. additionUpon addition there
3. concentrationwas concentrated in vacuo
4. dissolutionThe residue was then dissolved in methylene chloride (2 mL)
5. temperatureto warm to 25° C.
6. stirringstirred for 1 h
7. customAfter this time, the reaction was quenched with a small amount of methanol
8. additiondiluted with methylene chloride
9. concentrationconcentrated with silica gel (2 g) in vacuo
10. custompurified on Biotage Flash chromatography system (40S column, silica gel, 50% ethyl acetate/hexanes to 80% ethyl acetate/hexanes)