Bicyclo[2.2.1]heptane-1-methanesulfonic acid, 7,7-dimethyl-2-oxo-, (1S)- → 1-Cyclopentyl-7-[4-(piperidin-1-yl)phenylamino]-3,4-dihydro-pyrimido[4,5-d]pyrimidin-2(1H)-one

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A solution of 377 mg (2.14 mmol) of 1-(4-aminophenyl)piperidine, 300 mg (1.07 mmol) of 1-cyclopentyl-7-methanesulfinyl-3,4-dihydro-pyrimido[4,5-d]pyrimidin-2(1H)-one, 745 mg (3.21 mmol) of camphorsulfonic acid, and 2 mL of p-dioxane is heated at 130° C. for 1 hour in a sealed tube. The mixture is cooled and diluted with chloroform. The solution is washed twice with saturated aqueous sodium bicarbonate and once each with aqueous sodium chloride then brine. The organic phase is dried over magnesium sulfate and concentrated to leave a dark green residue that is dissolved in chloroform and chromatographed on silica gel eluting with 9:1:0.5 ethyl acetate/ethanol/triethylamine. The product fractions are pooled and concentrated to leave a residue that is dissolved in chloroform. The solution is diluted with ethyl acetate while most of the chloroform is being boiled away. Upon cooling, crystals form and are then collected to leave 101 mg (24%) of the title compound:

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