Boron tribromide → HCID 57725645, Verbindung
Reaktionsgleichung
[CH:1]1([C@@H:7]([NH:9][C:10]2[S:11][C:12]3[CH:18]=[C:17]([O:19]C)[CH:16]=[CH:15][C:13]=3[N:14]=2)[CH3:8])[CH2:6][CH2:5][CH2:4][CH2:3][CH2:2]1.B(Br)(Br)Br>C(Cl)Cl>[CH:1]1([C@@H:7]([NH:9][C:10]2[S:11][C:12]3[CH:18]=[C:17]([OH:19])[CH:16]=[CH:15][C:13]=3[N:14]=2)[CH3:8])[CH2:6][CH2:5][CH2:4][CH2:3][CH2:2]1Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Reaktionsbedingungen
- Temperatur
- 0 °C
Versuchsvorschrift
To the solution of (S)—N-(1-cyclohexylethyl)-6-methoxybenzo[d]thiazol-2-amine (3.39 g, 10 mmol) in 30 ml of DCM was added 1 M boron tribromide in DCM (20 ml, 20 mmol) slowly at 0° C. The reaction solution was stirred at 0° C. then at RT for 2 hr. The reaction mixture was concentrated to a solid. To the residual solids add 400 ml of ethyl acetate and 90 ml of water and stir at RT. for 10 minutes. With stirring, carefully add excess solid NaHCO3 until basic. Stir at RT about 1 hour to dissolve the solids. Remove the aqueous layer and extract with 100 ml of ethyl acetate. Combine organic layers and wash with 1×50 ml water, 1×50 ml saturated NaCl solution, dry with sodium sulfate, filter and concentrate under reduced pressure. The resulting solid was purified by silica gel column chromatography, eluted with (30% EtOAc: 70% Hexanes) and concentrated in vacuo to give (S)-2-(1-cyclohexylethylamino)benzo[d]thiazol-6-ol as solid (2.0 grams). ES/MS m/z 277.1 (MH+).