Acetonitrile → 2-(Pyridin-2-yl)-3-(imidazo[1,2-a]pyridin-6-yl)-5,6-dihydro-4H-pyrrolo[1,2-b]pyrazole

HRID 751297Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 751297
I[C:2]1[CH:3]=[CH:4][C:5]2[N:6]([CH:8]=[CH:9][N:10]=2)[CH:7]=1.[N:11]1[CH:16]=[CH:15][CH:14]=[CH:13][C:12]=1[C:17]1[C:18](B(O)O)=[C:19]2[CH2:24][CH2:23][CH2:22][N:20]2[N:21]=1.C(=O)(O)[O-].[Na+].C(#N)C>C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.O>[N:11]1[CH:16]=[CH:15][CH:14]=[CH:13][C:12]=1[C:17]1[C:18]([C:2]2[CH:3]=[CH:4][C:5]3[N:6]([CH:8]=[CH:9][N:10]=3)[CH:7]=2)=[C:19]2[CH2:24][CH2:23][CH2:22][N:20]2[N:21]=1

Komponenten

7

Edukt 4

HCID 6342AcetonitrileHCID 516892Sodium BicarbonateHCID 27643276-Iodoimidazo(1,2-a)pyridineHCID 59710031(2-pyridin-2-yl)-5,6-dihydro-4H-pyrrolo[1,2-b]pyrazole-3-boronic acid

Produkt 1

HCID 103801302-(Pyridin-2-yl)-3-(imidazo[1,2-a]pyridin-6-yl)-5,6-dihydro-4H-pyrrolo[1,2-b]pyrazoleAusbeute 72 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 178418397HCID 178418397, VerbindungKatalysatorHCID 962WaterLösungsmittel

Versuchsvorschrift

Add tetrakis(triphenylphosphine)palladium(0) (0.58 g, 0.5 mmol) to a 2 L flask containing a solution of 6-iodo-imidazo[1,2-a]pyridine (6.16 g, 25.2 mmol), 2-(pyridin-2-yl)-5,6-dihydro-4H-pyrrolo[1,2-b]pyrazole-3-boronic acid (Preparation 5; 6.07 g, 26.5 mmol), and sodium bicarbonate (4.24 g, 50.5 mmol) in 2.5:1 acetonitrile:water (700 mL). Reflux the reaction mixture for 3 h, cool, concentrate to about one half of the volume, extract into dichloromethane (4×250 ml), and concentrate. Flash chromatography using a gradient from 100% hexanes to 100% ethyl acetate (10 min, 45 ml/min), followed by isocratic 100% ethyl acetate (2 L), removes most impurities. Elution with ethyl acetate/methanol mixtures followed by tituration in hot ethyl acetate affords the title compound as a white solid 5.46 g, (72%). MS ES+ m/e 301.9 (M+1). 1H-NMR (400 MHz, DMSO-d6) δ 8.56 (s, 1H), 8.39 (d, J=3.2 Hz, 1H), 7.87 (s, 1H), 7.81-7.76 (m, 2H), 7.51 (d, J=1.2, 1H), 7.42 (d, J=9.2 Hz, 1H), 7.26 (m, 1H), 7.05 (dd, J=9.2, 2 Hz, 1H), 4.2 (t, J=6.6 Hz, 2H, 2.99 (t, J=6.6 Hz, 2H), 2.59 (m, 1H).

Aufarbeitung

  1. temperatureReflux the reaction mixture for 3 h
  2. temperaturecool
  3. concentrationconcentrate to about one half of the volume
  4. extractionextract into dichloromethane (4×250 ml)
  5. concentrationconcentrate
  6. customto 100% ethyl acetate (10 min, 45 ml/min)
  7. customremoves most impurities
  8. washElution with ethyl acetate/methanol

Quellen und Nachweise

ORD-Eintrag
ord-6ee6b4db67a14077bee095180643416c
Quelldatensatz
uspto-grants-2008_07
Patentnummer
US07405299B2

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