Reaktion #575167

Reaktionsgleichung

copper (I) cyanide

5-bromo-3-methyl benzo[b]thiophene

→

off-white solid

Ausbeute 90.1%

5-Cyano-3-methyl benzo[b]thiophene

Ausbeute 90.1%

Lösungsmittel

N-methylpyrrolidinone

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThis was then partitioned between ether (75 ml) and ammonia solution (75 ml)
2. 2
   SonstigeThe ether layer was separated
3. 3
   Waschenwashed with more ammonia solution (2×50 ml)
4. 4
   Trocknendried (Na2SO4)
5. 5
   Sonstigeevaporated in vacuo

Vorschrift

To copper (I) cyanide (0.569 g, 6.35 mmol) was added 5-bromo-3-methyl benzo[b]thiophene (1.179 g, 5.19 mmol) in N-methylpyrrolidinone (10 ml) and the mixture was stirred at 180°-190° C. for 17 h. This was then partitioned between ether (75 ml) and ammonia solution (75 ml). The ether layer was separated, washed with more ammonia solution (2×50 ml), dried (Na2SO4) and evaporated in vacuo to leave 0.81 g of an off-white solid. Chromatography on flash silica, eluting with 10% ethyl acetate/petroleum ether yielded 0.76 g (85%) of the title compound as a white solid. δ (CDCl3) 2.47 (3H, s), 7.23 (1H, s), 7.55 (1H, dd, J=8.3 and 1.5 Hz), 7.93 (1H, d, J=8.4 Hz), 8.03 (1H, d, J=1.4 Hz).

Quelle