Cyanogen Bromide → 5,6-difluoro-1H-1,3-benzodiazol-2-amine

HRID 9580

Reaktionsgleichung

Reaktionsgleichung von HRID 9580
[NH2:1][C:2]1[CH:7]=[C:6]([F:8])[C:5]([F:9])=[CH:4][C:3]=1[NH2:10].[N:11]#[C:12]Br.C(=O)(O)[O-].[Na+]>O>[F:8][C:6]1[C:5]([F:9])=[CH:4][C:3]2[NH:10][C:12]([NH2:11])=[N:1][C:2]=2[CH:7]=1

Komponenten

5

Edukt 3

HCID 10476Cyanogen BromideHCID 516892Sodium BicarbonateHCID 27367551,2-Diamino-4,5-difluorobenzene

Produkt 1

HCID 106787085,6-difluoro-1H-1,3-benzodiazol-2-amineAusbeute 98,8 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 962WaterLösungsmittel

Versuchsvorschrift

The procedure used was similar to that reported in J. Med. Chem. 40:811–818, 1997. A solution of 1,2-diamino-4,5-difluorobenzene (500 mg, 3.47 mmol) in water (5 mL) was cooled to 0° C. and then treated with a solution of cyanogen bromide (0.83 mL, 4.16 mmol, 5 M in acetonitrile) and solid sodium bicarbonate (583 mg, 6.94 mmol). The solution was stirred at rt overnight and was then concentrated in vacuo. The dark residue was suspended in ethanol and heated at reflux for 15 minutes. The hot suspension was filtered, rinsing with hot ethanol, and the filtrate was concentrated in vacuo to afford 5,6-difluoro-1H-benzimidazol-2-amine (580 mg, 59%), which was used in the next step without further purification. LC-MS m/z 170.2 (MH+), ret. time 0.85 min; 1H NMR (300 MHz, DMSO-d6) δ 6.30 (br s, 2H), 7.06 (dd, 2H), 10.79 (br s, 1H).

Aufarbeitung

  1. concentrationwas then concentrated in vacuo
  2. temperatureheated
  3. temperatureat reflux for 15 minutes
  4. filtrationThe hot suspension was filtered
  5. washrinsing with hot ethanol
  6. concentrationthe filtrate was concentrated in vacuo

Quellen und Nachweise

ORD-Eintrag
ord-d6c3407adb094fd186601245d5ddcf08
Quelldatensatz
uspto-grants-2006_08
Patentnummer
US07091228B2

Verknüpfte Notizen

Wird geladen…