1,2-Dibromo-1,1,2,2-tetrafluoroethane → 7-Bromo-6-chloro-3-(2-fluorophenyl)-1,2,4-triazolo[4,3-b]pyridazine

HRID 1369437

Reaktionsgleichung

Reaktionsgleichung von HRID 1369437
[Cl:1][C:2]1[C:3]([Si](C)(C)C)=[CH:4][C:5]2[N:6]([C:8]([C:11]3[CH:16]=[CH:15][CH:14]=[CH:13][C:12]=3[F:17])=[N:9][N:10]=2)[N:7]=1.[Br:22]C(F)(F)C(F)(F)Br>CCCC[N+](CCCC)(CCCC)CCCC.C1C=CC([Sn-](F)(F)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.C1COCC1.ClCCl>[Br:22][C:3]1[C:2]([Cl:1])=[N:7][N:6]2[C:8]([C:11]3[CH:16]=[CH:15][CH:14]=[CH:13][C:12]=3[F:17])=[N:9][N:10]=[C:5]2[CH:4]=1

Komponenten

6

Edukt 2

HCID 313011,2-Dibromo-1,1,2,2-tetrafluoroethaneHCID 154861756-Chloro-3-(2-fluorophenyl)-7-(trimethylsilyl)-[1,2,4]triazolo[4,3-b]pyridazine

Produkt 1

HCID 154861767-Bromo-6-chloro-3-(2-fluorophenyl)-1,2,4-triazolo[4,3-b]pyridazineAusbeute 88 %

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 1784490421-Butanaminium, N,N,N-tributyl-, (TB-5-11)-difluorotriphenylstannate(1-) (1:1)KatalysatorHCID 6344DichloromethaneLösungsmittelHCID 8028TetrahydrofuranLösungsmittel

Versuchsvorschrift

Tetrabutylammonium difluorotriphenylstannate (6.8 g, 10.8 mmol) was added to a suspension of 6-chloro-3-(2-fluorophenyl)-7-(trimethylsilyl)-1,2,4-triazolo[4,3-b]pyridazine (3.17 g, 9.88 mmol), prepared as in Example 25 Step c), and 1,2-dibromotetrafluoroethane (6.0 ml, 50 mmol) in anhydrous THF (75 ml) and the mixture was stirred at room temperature under nitrogen for 18 h. The mixture was diluted with dichloromethane (100 ml), filtered and the filtrate was concentrated. Flash column chromatography on silica gel, eluting with 50-100% EtOAc-hexane, gave 7-bromo-6-chloro-3-(2-fluorophenyl)-1,2,4-triazolo[4,3-b]pyridazine (2.84 g, 88%) as an off-white solid; 1H NMR (360 MHz, CDCl3) δ7.31 (1H, dd, J=10 and 10 Hz), 7.36 (1H, ddd, J=8, 8 and 1 Hz), 7.57-7.63 (1H, m), 7.87 (1H, ddd, J=7, 7 and 2 Hz), 8.49 (1H, s); MS (ES+) m/e 327/329/331 [MH]+.

Aufarbeitung

  1. filtrationfiltered
  2. concentrationthe filtrate was concentrated
  3. washFlash column chromatography on silica gel, eluting with 50-100% EtOAc-hexane

Quellen und Nachweise

ORD-Eintrag
ord-bfe563adb7d34089ba47ecc4ceee669c
Quelldatensatz
uspto-grants-2003_06
Patentnummer
US06579875B1

Verknüpfte Notizen

Wird geladen…