N-methyl-2-pyrrolidone → 3-(2-chlorophenyl)-7-[(1-tert-butoxycarbony-piperidin-4-ylmethyl)amino]-3,4-dihydropyrimido[4,5-d]pyrimidin-2(1H)-one

Participants

Reaction Conditions

Reaction Steps

Sulfone 9.1 (2.24 g, 5.4 mmol) was combined with N-tert-butoxycarbonyl-4-aminomethylpiperidine (5.6 g, 16.2 mmol) and 1-methyl-2-pyrrolidinone (9 mL). The mixture was heated to 100-110° C. for 2 hours at which time it was cooled to room temperature and ethyl acetate was added. The resultant white solid was filtered and washed with ethyl acetate to give 2.3 g of 3-(2-chlorophenyl)-7-[(1-tert-butoxycarbony-piperidin-4-ylmethyl)amino]-3,4-dihydropyrimido[4,5-d]pyrimidin-2(1H)-one (MH+=473). Hydrogen chloride gas was bubbled into 2.1 g of the protected amine which was suspended in 1,4-dioxane (22 mL), and the suspension stirred for 1 hour, concentrated in vacuo and dried to give the intermediate 3-(2-chlorophenyl)-7-[(piperidin-4-ylmethyl)amino]-3,4-dihydropyrimido[4,5-d]pyrimidin-2(1H)-one as a white solid.

Provenance & Evidence