Reaktion #1579639

Reaktionsgleichung

4-bromo-6-cyano-3,4-dihydro-2,2-dimethyl-2H-1-benzopyran

sodium azide

→

gum

Ausbeute 97.4%

4-Azido-6-cyano-3,4-dihydro-2,2-dimethyl-2H-1-benzopyran

Ausbeute 97.4%

Lösungsmittel

N,N-dimethylformamide

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe reaction mixture was partitioned between 100 mL ethyl acetate and 200 mL
2. 2
   workup.DISTILLATIONdistilled water
3. 3
   SonstigeThe organic layer was separated
4. 4
   Extraktionthe aqueous layer was extracted with 100 mL of ethyl acetate
5. 5
   WaschenThe combined organics were washed successively with distilled water, saturated sodium bicarbonate solution, brine
6. 6
   Trocknendried over magnesium sulfate
7. 7
   SonstigeThe solvent was evaporated under vacuum

Vorschrift

A solution of 4-bromo-6-cyano-3,4-dihydro-2,2-dimethyl-2H-1-benzopyran (6.73 g, 25.29 mmoles), title B compound, in dry N,N-dimethylformamide (100 mL) was treated with sodium azide (3.79 g, 50.57 mmoles) and stirred at room temperature under argon for four hours. The reaction mixture was partitioned between 100 mL ethyl acetate and 200 mL distilled water. The organic layer was separated and the aqueous layer was extracted with 100 mL of ethyl acetate. The combined organics were washed successively with distilled water, saturated sodium bicarbonate solution, brine and dried over magnesium sulfate. The solvent was evaporated under vacuum to obtain an orange gum (5.62 g) which was triturated with penme to provide the title compound (4.50 g, 78%) as an off-white solid, m.p. 63°-64° C.

Quelle