Sodium Carbonate → 3-Methyl-2-trimethylsilanyl-1H-indole-5-carbonitrile

Participants

Reaction Conditions

Reaction Steps

1-(Trimethylsilyl)propyne (2.23 ml, 1.68 g, 15.0 mmol), 4-amino-3-iodobenzonitrile (3.33 g, 13.65 mmol), lithium chloride (606 mg, 14.3 mmol) and sodium carbonate (4.35 g, 40.95 mmol) were added successively to abs. dimethylformamide (60 ml) under argon. Pd(dppf)Cl2 (1.116 g, 1.365 mmol) was added to this mixture and the reaction mixture was heated at 100° C. with exclusion of moisture for 6 h and then stirred at room temperature for 16 h. For working up of the mixture, water (150 ml) and ethyl acetate (300 ml) was added and the mixture was stirred for 10 min. After separation of the phases, the aqueous phase was extracted with ethyl acetate (3×100 ml). The combined organic phases were washed with saturated sodium chloride solution (3×100 ml), dried and concentrated. The residue was a brown oil (5.5 g) which, apart from 3-methyl-2-trimethylsilanyl-1H-indole-5-carbonitrile, contained traces of the isomer 2-methyl-3-trimethylsilanyl-1H-indole-5-carbonitrile and DMF.

Provenance & Evidence