HCID 15751520, compound → HCID 15751521, compound

Participants

Reaction Steps

tert-Butyl 4-[2-(benzyloxy)-5-cyclopropyl-8-fluoro-1,2,3,5-tetrahydro-1,3-dioxopyrimido[1,6-a]benzimidazol-7-yl]-1-piperazinecarboxylate (981 mg, 1.87 mmol) is dissolved in ethanol (250 ml) and hydrogenated with 5 percent palladium/carbon (200 mg) under hydrogen at normal pressure. The palladium/carbon is filtered off and washed with dimethylformamide (100 ml) at 100°. The combined filtrates are evaporated under reduced pressure. The residue is recrystallized from dimethylformamide. There are obtained 619 mg (72%) of tert-butyl 4-[5-cyclopropyl-8-fluoro-1,2,3,5-tetrahydro-2-hydroxy-1,3-dioxopyrimido[1,6-a]benzimidazol-7-yl]-1-piperazinecarboxylate.

Provenance & Evidence