Reaktion #450969

Reaktionsgleichung

water

7-amino-2,3-dihydro-2,2-dimethylbenzofuran

N-bromosuccinimide

→

7-amino-4-bromo-2,3-dihydro-2,2-dimethylbenzofuran

Ausbeute 83.3%

Lösungsmittel

N,N-dimethylformamide

N,N-dimethylformamide

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONUpon completion of addition
2. 2
   ExtraktionThe mixture was then extracted with two 200 mL portions of diethyl ether
3. 3
   WaschenThe combined extracts were washed with two 100 mL portions of an aqueous 10% lithium chloride solution
4. 4
   TrocknenThe organic layer was dried with magnesium sulfate
5. 5
   Filtrationfiltered
6. 6
   EinengenThe filtrate was concentrated under reduced pressure

Vorschrift

A stirred solution of 10.0 grams (0.061 mole) of 7-amino-2,3-dihydro-2,2-dimethylbenzofuran in 150 mL of N,N-dimethylformamide was cooled in an ice-water bath, and asolution of 10.9 grams (0.061 mole) of N-bromosuccinimide in 50 mL of N,N-dimethylformamide was added in one portion. Upon completion of addition, the reaction mixture was maintained in the ice-water bath for about one hour. After this time the reaction mixture was poured into about 600 mL of water. The mixture was then extracted with two 200 mL portions of diethyl ether. The combined extracts were washed with two 100 mL portions of an aqueous 10% lithium chloride solution. The organic layer was dried with magnesium sulfate and filtered. The filtrate was concentrated under reduced pressure, yielding 12.3 grams of 7-amino-4-bromo-2,3-dihydro-2,2-dimethylbenzofuran. The NMR spectrum was consistent with the proposed structure.

Quelle