Sodium hydride → HCID 20071554, compound

Participants

Reaction Conditions

Reaction Steps

To a suspension of 5.38 g sodium hydride (0.22 mole) in 600 ml dry dimethylsulphoxide maintained at 35° C. 32.6 g 2,3-dimethyl-9-bromo-6H-indolo(2,3-b)quinoxaline (0.10 mol) is added under nitrogen and with good stirring. 30 minutes after completed addition 15.9 g N,N-dimethylamino-2-chloroethane-HCl (0.11 mole) are added at 35° C. The mixture is stirred at 35° C. for four hours and then the solvent is distilled off in vacuum at room temperature. The residue is dissolved after soaking out with water in methylacetate and slowly cooled to -30° C. whereby the base crystallizes out. Yield 22 g, 55%, mp. 146°-147° C.

Provenance & Evidence