Nitronium tetrafluoroborate → 5-Acetyl-2-chloro-5,11-dihydro-11-ethyl-4-methyl-3-nitro-6H-dipyrido[3,2-b:2',3'-e][1,4]diazepin-6-one

Participants

Reaction Steps

To a solution of 5-acetyl-2-chloro-5,11-dihydro-11-ethyl-4-methyl-6H-dipyrido[3,2-b:2',3'-e][1,4]diazepin-6-one (3.36 g) in acetonitrile (20 mL) cooled on ice was added nitronium tetrafluoroborate (85%, 2.26 g). The mixture was removed from the ice bath and was stirred for 5 hours. The reaction then was quenched with 10% potassium carbonate. Ethyl acetate was added and the organic phase was separated, washed, dried, and evaporated. Chromatography over silica gel gave 0.71 g of the title compound, which crystallized from diisopropyl ether, m.p. 140-141.

Provenance & Evidence