Reaktion #77180

Reaktionsgleichung

K2CO3

4-iodotoluene

18-crown-6

2-phenylindole

→

1,2-diphenylindole

Ausbeute 75.0%

Lösungsmittel

o-dichlorobenzene

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturAfter cooling to room temperature
2. 2
   Waschenthe reaction mixture was washed with hexane
3. 3
   workup.DISSOLUTIONThe solid mixture was dissolved in EA
4. 4
   Sonstigethe K2CO3 and copper powder was removed by filtration
5. 5
   SonstigeEA solution was evaporated under reduced pressure
6. 6
   Sonstigeto give brown-red crude solid
7. 7
   SonstigeFurther purification by column chromatography on silica gel with hexane as an eluent

Vorschrift

A solution of dry o-dichlorobenzene containing 2-phenylindole (1 mmole) was added K2CO3 (1.5 mmole), 4-iodotoluene (1 mmole), copper powder (1.5 mmole) and 18-crown-6 (0.02 mmole), the reaction mixture was stirred under argon at 185° C. overnight. After cooling to room temperature, the reaction mixture was washed with hexane. The solid mixture was dissolved in EA, the K2CO3 and copper powder was removed by filtration. EA solution was evaporated under reduced pressure to give brown-red crude solid. Further purification by column chromatography on silica gel with hexane as an eluent gave a pale yellow solid of 1,2-diphenylindole (75% yield). The solid product (1 mmole) was dissolved in DMF (10 ml), a mixture of POCl3 (1.2 mmole) and DMF (1.2 mmole) was added dropwise. After stirring at 75° C. for 1 h, the reaction mixture was added into saturate NaHCO3 solution. The precipitated solid was collected by filtration and washed with ethanol to give a pale gray solid of 1,2-diphenylindole-3-carboxaldehyde (90% yield). A dry DMF solution of the aldehyde (2 mmole) was added o-aminothiophenol (2.1 mmole) and Ac2O (0.5 ml) at room temperature. The mixture was stirred at 60° C. for 3 h. The reaction mixture was poured into stirred water and the precipitated solid was collected by filtration. The crude solid was washed with MeOH and recrystallized from benzene to afford compound 1-4(32% yield). 1H-NMR (CDCl3, TMS) δ(ppm)=2.4 (s, 3H, Ar—CH3), 7.1-7.6, 8.2 (m, d, 17H, aromatic H).

Quelle