Dimethylformamide → 6-chloro-5-(5-phenylpyrazin-2-yl)-1H-indole-3-carbaldehyde

Participants

Reaction Conditions

Reaction Steps

To a 0.4M solution of chlormethylene dimethylammonium chloride in DMF (7.5 mL, 3.8 mmol) was added 6-chloro-5-(5,5-dimethyl-1,3,2-dioxaborinan-2-yl)-1H-indole (493 mg, 1.88 mmol). The mixture was stirred at 30° C. for 2 hrs. 0.50 mL of this solution (0.15 mmol) was placed in a vial with a 0.3M solution of 2-chloro-5-phenylpyrazine in DMF (0.50 mL, 0.15 mmol). 2M potassium carbonate (0.30 mL, 0.60 mmol) was then added and the mixture purged with nitrogen. PddppfCl2 (9 mg, 0.01 mmol) was then added and the vial capped and heated to 90° C. for 3 hours. The reaction mixture was concentrated by Speedvac and purified via preparative TLC to give the title compound that was taken forward without further purification.

Provenance & Evidence