Reaktion #45237

Reaktionsgleichung

naphthalene-1-carbonyl fluoride

solution

3-[3-(5-amino-3-t-butyl-pyrazol-1-yl)-phenyl]-propionic acid ethyl ester

→

3-(3-{3-t-butyl-5-[(naphthalene-1-carbonyl)-amino]-pyrazol-1-yl}-phenyl)-propionic acid ethyl ester

Lösungsmittel

CH2Cl2

CH2Cl2

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeAfter quenching with water (100 mL)
2. 2
   Extraktionthe reaction mixture was extracted with ethyl acetate (3×100 mL)
3. 3
   WaschenThe combined organic extracts were washed with brine
4. 4
   Trocknendried (NaSO4)
5. 5
   Filtrationfiltered
6. 6
   Einengenconcentrated under reduced pressure
7. 7
   Sonstigeto yield a residue which
8. 8
   Sonstigewas purified by flash chromatography

Vorschrift

A solution of Example Z (315 mg, 1.0 mmol) and Barton's base (0.5 mL) in anhydrous CH2Cl2 (5 mL) under N2 was stirred at RT for 30 min, and then added to a solution of naphthalene-1-carbonyl fluoride (348 mg, 0.2 mmol) in anhydrous CH2Cl2 (5 mL). The resulting mixture was stirred at RT overnight. After quenching with water (100 mL), the reaction mixture was extracted with ethyl acetate (3×100 mL). The combined organic extracts were washed with brine, dried (NaSO4), filtered and concentrated under reduced pressure to yield a residue which was purified by flash chromatography to afford 3-(3-{3-t-butyl-5-[(naphthalene-1-carbonyl)-amino]-pyrazol-1-yl}-phenyl)-propionic acid ethyl ester, (350 mg, 74%). 1H-NMR (CDCL3): 8.29 (d, J=8.0 Hz, 1H), 7.98 (d, J=7.2 Hz, 2H), 7.89 (d, J=7.2 Hz, 1H), 7.62-7.57 (m, 3H), 7.49-7.28 (m, 4H), 7.03 (s, 1H), 3.94 (q, J=7.2 Hz, 2H), 2.96 (t, J=7.2 Hz, 2H), 2.58 (t, J=7.2 Hz, 2H), 1.45 (s, 9H), 1.13 (t, J=7.2 Hz, 3H); MS (ESI) m/z: 470 (M+H+).

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