Cesium carbonate → N,N-dimethylaminoethyl 2-(N,N-dimethylamino)ethoxy-benz[b]acridine-12-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-hydroxy-benz[b]acridine-12-carboxylic acid hydrochloride (360 mg, 1.108 mmol) in methyl sulfoxide (11 ml) were added cesium carbonate (3.61 g, 11.08 mmol) and N,N-dimethylaminoethyl bromide hydrobromide (1.03 g, 4.432 mmol). After 15 hours of stirring at 60° C. under nitrogen, the reaction mixture was diluted with methyl sulfoxide (20 ml) and filtered to remove the insoluble impurities. The filtrate was concentrated under reduced pressure to a small volume, which was separated on a preparative-TLC plate (2 mm silica gel) by developing with chloroform/methanol/water (47:48:5). The desired orange band was collected and extracted with 25% methanol/chloroform. Removal of the solvents under reduced pressure gave N,N-dimethylaminoethyl 2-(N,N-dimethylamino)ethoxy-benz[b]acridine-12-carboxylate (86 mg, 18%). Rf 0.6 (silica gel, chloroform/methanol/water 65:25:4). MS (FAB, Glycerol Matrix): m/z 432 (M+1).

Provenance & Evidence