N'-Hydroxybenzenecarboximidamide → 3-Butyl-8-chloro-1-[4-(3-phenyl-1,2,4-oxadiazol-5-yl)butyl]-3,7-dihydro-1H-purine-2,6-dione

Participants

Reaction Steps

CDl (0.98 g, 6.1 mmol) was added to a solution of 5-(3-butyl-8-chloro-2,6-dioxo-2,3,6,7-tetrahydro-1H-purin-1-yl)pentanoic acid (1.89 g, 5.5 mmol) in DMF (15 ml) and stirred under nitrogen for 1.5 h. Benzamidoxime (0.91 g, 6.1 mmol) was added and the mixture stirred at 110° C. overnight. The reaction mixture was partitioned between EtOAc and 2M HCl. The organic layer was separated, washed with brine, dried (MgSO4) and evaporated. The crude product was crystallised from methanol and then further purified using the Companion™ system and a gradient elution from cyclohexane to EtOAc. Product containing fractions were combined and evaporated to give the title compound as a white solid (850 mg).

Provenance & Evidence