Methyl iodide → Methyl 1-methyl-1H-indazole-6-carboxylate

HRID 514397

Reaktionsgleichung

Reaktionsgleichung von HRID 514397
[NH:1]1[C:9]2[C:4](=[CH:5][CH:6]=[C:7]([C:10]([O:12][CH3:13])=[O:11])[CH:8]=2)[CH:3]=[N:2]1.[H-].[Na+].[CH3:16]I>O>[CH3:16][N:1]1[C:9]2[C:4](=[CH:5][CH:6]=[C:7]([C:10]([O:12][CH3:13])=[O:11])[CH:8]=2)[CH:3]=[N:2]1.[CH3:16][N:2]1[CH:3]=[C:4]2[C:9]([CH:8]=[C:7]([C:10]([O:12][CH3:13])=[O:11])[CH:6]=[CH:5]2)=[N:1]1

Komponenten

6

Edukt 3

HCID 6328Methyl iodideHCID 24758Sodium hydrideHCID 286535methyl 1H-indazole-6-carboxylate

Produkt 2

HCID 22598983Methyl 1-methyl-1H-indazole-6-carboxylateHCID 37818688Methyl 2-methyl-2H-indazole-6-carboxylate

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 962WaterLösungsmittel

Versuchsvorschrift

To an ice-cooled solution of methyl 1H-indazole-6-carboxylate (566 mg, 3.21 mmol) was added NaH (154 mg, 3.85 mmol), the mixture was then stirred at room temperature for 30 min. Methyl iodide (547 mg, 3.85 mmol) was added drop wise, and the reaction mixture was stirred overnight. Cooled to 0° C., added water and extracted with ethyl acetate. The organic phase was concentrated and purified by gel chromatograph to provide 130 mg of methyl 1-methyl-1H-indazole-6-carboxylate and 230 mg of methyl 2-methyl-2H-indazole-6-carboxylate, 59%. 1H NMR for methyl 1-methyl-1H-indazole-6-carboxylate: 1H NMR (400 MHz, CDCl3): δ 3.97 (3H, s), 4.14 (3H, s), 7.74-7.82 (2H, m), 8.02 (1H, s), 8.17 (1H, d, J=0.8 Hz). 1H NMR for methyl 2-methyl-2H-indazole-6-carboxylate: 1H NMR (400 MHz, CDCl3): δ 3.94 (3H, s), 4.25 (3H, s), 7.65-7.72 (2H, m), 7.92 (1H, s), 8.47 (1H, d, J=1.2 Hz). [M+H] Calc'd for C10H10N2O2, 191. Found, 191.

Aufarbeitung

  1. stirringthe reaction mixture was stirred overnight
  2. temperatureCooled to 0° C.
  3. extractionextracted with ethyl acetate
  4. concentrationThe organic phase was concentrated
  5. custompurified by gel chromatograph

Quellen und Nachweise

ORD-Eintrag
ord-aa3919e6d7b24fa192a385ad983de516
Quelldatensatz
uspto-grants-2015_08
Patentnummer
US09107916B2

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