Reaktion #85380

Reaktionsgleichung

3-((3,3,3-trifluoropropyl)thio)propanoyl chloride

3-chloro-N-ethyl-1-(pyridine-3-yl)-1H-pyrazol-4-amine

ethyl acetate

Sodium bicarbonate

→

N-(3-Chloro-1-(pyridin-3-yl)-1H-pyrazol-4-yl)-N-ethyl-3-((3,3,3-trifluoropropyl)thio)propanamide

Lösungsmittel

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigethe layers separated
2. 2
   ExtraktionThe aqueous layer was extracted with ethyl acetate (20 mL)
3. 3
   Einengenthe combined organic layers were concentrated to dryness
4. 4
   Sonstigeto afford a light brown solid (10.1 g, quantitative)
5. 5
   SonstigeA small sample of crude product was purified by flash column chromatography
6. 6
   Sonstigeto obtain an analytical sample

Vorschrift

A 100 mL three-neck round bottom flask was charged with 3-chloro-N-ethyl-1-(pyridine-3-yl)-1H-pyrazol-4-amine (5.00 g, 22.5 mmol) and ethyl acetate (50 mL). Sodium bicarbonate (4.72 g, 56.1 mmol) was added, followed by dropwise addition of 3-((3,3,3-trifluoropropyl)thio)propanoyl chloride (5.95 g, 26.9 mmol) at <20° C. for 2 hours, at which point HPLC analysis indicated that the reaction was complete. The reaction was diluted with water (50 mL) (off-gassing) and the layers separated. The aqueous layer was extracted with ethyl acetate (20 mL) and the combined organic layers were concentrated to dryness to afford a light brown solid (10.1 g, quantitative). A small sample of crude product was purified by flash column chromatography using ethyl acetate as eluent to obtain an analytical sample: mp 79-81° C.; 1H NMR (400 MHz, DMSO-d6) δ 9.11 (d, J=2.7 Hz, 1H), 8.97 (s, 1H), 8.60 (dd, J=4.8, 1.4 Hz, 1H), 8.24 (ddd, J=8.4, 2.8, 1.4 Hz, 1H), 7.60 (ddd, J=8.4, 4.7, 0.8 Hz, 1H), 3.62 (q, J=7.2 Hz, 2H), 2.75 (t, J=7.0 Hz, 2H), 2.66-2.57 (m 2H), 2.57-2.44 (m, 2H), 2.41 (t, J=7.0 Hz, 2H), 1.08 (t, J=7.1 Hz, 3H). EIMS m/z 406 ([M]+).

Quelle