Cyanogen Bromide → 9-[4-(1-Aminocyclobutyl)phenyl]-8-phenyl[1,2,4]triazolo[4,3-h]-1,7-naphthyridin-3-amine

Participants

Reaction Conditions

Reaction Steps

A mixture of tert-butyl {1-[4-(8-hydrazino-3-phenyl-1,7-naphthyridin-2-yl)phenyl]cyclobutyl}carbamate (7-5) (30 mg, 0.0620 mmol), cyanogen bromide (19.8 mg, 0187 mmol) in ethanol (2 mL) was stirred at 60° C. for 72 hours. The mixture was diluted with AcOEt, washed with water, dried over sodium sulfate, filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel. The residue was treated with HCl in MeOH and the mixture was heated in a microwave reactor at 80° C. for 5 min. The solvent was evaporated and the residue was purified by reverse phase HPLC (H2O/0.1% TFA aq.-MeCN/0.1% TFA aq.) to give 9-[4-(1-aminocyclobutyl)phenyl]-8-phenyl[1,2,4]triazolo[4,3-h]-1,7-naphthyridin-3-amine (8-1) as a pale yellow solid.

Provenance & Evidence