Bicyclo[2.2.1]heptane-1-methanesulfonic acid, 7,7-dimethyl-2-oxo-, (1S)- → 1-[1-(8,9-dimethyl-9H-purin-6-yl)piperidin-4-yl]-1,3-dihydro-2H-benzimidazol-2-one

Participants

Reaction Steps

To 1-{1-[5-amino-6-(methylamino)pyrimidin-4-yl]piperidin-4-yl}-1,3-dihydro-2H-benzimidazol-2-one (150 mg, 0.442 mmol) in acetonitrile (2 mL) was added camphorsulfonic acid (4.9 mg, 0.02 mmol) and trimethylorthoacetate (2 mL, 16.6 mmol). The mixture was heated at reflux for 15 h, then was cooled to ambient and was purified by preparative-HPLC to afford 1-[1-(8,9-dimethyl-9H-purin-6-yl)piperidin-4-yl]-1,3-dihydro-2H-benzimidazol-2-one as a beige solid (28 mg, 0.077 mmol, 17% yield).

Provenance & Evidence