Triethylamine → 3,4-Dihydro-2-methyl-4-[2-[4-(2-pyrimidinyl)-1-piperazinyl]ethyl]-pyrimido[1,6-a]benzimidazol-1(2H)-one

Participants

Reaction Steps

To 60 mL of toluene was added 4.0 g (0.0152 mol) of 4-(2-chloroethyl)-3,4-dihydro-2-methylpyrimido[1,6-a]benzimidazol-1(2H)-one, 6.0 g (0.033 mol) of 1-(2-pyrimidyl)piperazine, and 4.0 g (0.04 mol) of triethylamine. The reaction mixture was heated at reflux for 2 days and subsequently washed with 2×50 mL of 1N NaOH, dried over Na2SO4, filtered, and concentrated by rotary evaporation. Crystallization from ethyl acetate afforded 4.0 g, 67% of analytically pure crystals, mp 161°-62° C.

Provenance & Evidence