Reaktion #1564577

Reaktionsgleichung

sodium nitrite

6-aminobenzothiazole

HBr

ammonia

→

6-bromobenzothiazole

Lösungsmittel

HCl

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONAfter the addition
2. 2
   workup.STIRRINGthe mixture was stirred at 60° C. for 1.5 h
3. 3
   TemperaturCooled down
4. 4
   Extraktionextracted with diethyl ether
5. 5
   ExtraktionThe combined extract
6. 6
   Waschenwas washed with water, brine
7. 7
   Sonstigedried
8. 8
   Einengenconcentrated

Vorschrift

A solution of sodium nitrite (0.147 g, 2.1 mmol) in water (1.0 mL) was slowly added to a suspension of 6-aminobenzothiazole (0.30 g, 2.0 mmol) in HBr (48% in water, 3 mL) at 0° C. and then the mixture was stirred at room temperature for 30 min. The formed solution was then slowly added to a solution of copper (I) bromide (0.435 g, 3.0 mmol) in HCl (conc., 5 mL) at 0° C. After the addition, the mixture was stirred at 60° C. for 1.5 h. Cooled down, and the reaction mixture was basified with excess ammonia and extracted with diethyl ether. The combined extract was washed with water, brine, dried and concentrated. The 6-bromobenzothiazole (0.26 g) was obtained by Combiflash and then converted to the final compound using procedures analogous to those for example 1, MS(ESI): (M+H)+=413.1.

Quelle