Reaktion #1852030

Reaktionsgleichung

SnCl2.2H2O

HCl

5-Bromo-2-[(3-chloropropyl)sulfanyl]aniline

NaNO2

→

1-{5-bromo-2-[(3-chloropropyl)sulfanyl]phenyl}hydrazine hydrochloride

Lösungsmittel

TFA

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturThe flask was warmed to rt
2. 2
   TemperaturThe flask was re-cooled to 0° C.
3. 3
   workup.STIRRINGThe solution was stirred for 3 hours
4. 4
   FiltrationThe precipitate was collected by filtration
5. 5
   Sonstigethe residue was air-dried overnight

Vorschrift

5-Bromo-2-[(3-chloropropyl)sulfanyl]aniline (0.938 g, 3.3 mmol) was dissolved in TFA (4 mL). The reaction flask was cooled to 0° C. and HCl (15 mL) was added. To the resulting suspension, an aqueous solution of NaNO2 (0.25 g, 3.7 mmol, 3 mL H2O) was slowly added. The flask was warmed to rt and stirred for 2 hrs. The flask was re-cooled to 0° C. and was transferred via cannula to an aqueous solution of SnCl2.2H2O (1.49 g, 6.6 mmol, 3 mL of H2O). The solution was stirred for 3 hours. The precipitate was collected by filtration and the residue was air-dried overnight. 1-{5-bromo-2-[(3-chloropropyl)sulfanyl]phenyl}hydrazine hydrochloride was isolated (0.800 g, 73%) was a light-brown powder. 1H NMR (CD3OD, 300 Mhz) δ7.42 (d, 1H, 8.0 Hz), 7.14-7.21 (m, 2H), 3.66 (t, 2H, 6.2 Hz), 2.97 (t, 2H, 6.9 Hz), 1.90-1.99 (m, 2H) ppm. MS (CI, NH3): 297 (base, M+H).

Quelle