Sodium triacetoxyborohydride → 5-{4-[2-(4-Diethylamino-phenyl)-1H-benzoimidazol-4-yl]-piperazin-1-ylmethyl}-1-ethyl-1H-pyrimidine-2,4-dione

Participants

Reaction Steps

To a solution of Diethyl-[4-(4-piperazin-1-yl-1H-benzoimidazol-2-yl)-phenyl]-amine (1.0 g, 2.0 mMol) in N-methylpyrrolidinone (10 mL) was added 1-Ethyl-2,4-dioxo-1,2,3,4-tetrahydro-pyrimidine-5-carbaldehyde (0.404 g, 2.40 mMol) followed by sodium triacetoxyborohydride (0.849 g, 4.01 mMol) and the mixture stirred at room temperature overnight. Upon arrival the crude reaction mixture was diluted with water (2 mL), filtered, and purified by RP-HPLC (Method E) to yield 168 mg (17% yield) of 5-{4-[2-(4-Diethylamino-phenyl)-1H-benzoimidazol-4-yl]-piperazin-1-ylmethyl}-1-ethyl-1H-pyrimidine-2,4-dione as a very light yellow solid. 1H NMR (DMSO-d6): δ=12.33 (s,1H), 11.25 (s,1H), 7.91 (d, 2H, J=9 Hz), 7.66 (s, 1H), 6.96 (m, 2H), 6.77 (d,2H, J=9 Hz), 6.45 (dd, 1H, J=6.0, 2.8 Hz), 3.74 (q, 2H, J=7.1 Hz), 3.53 (br s, 4 h), 3.40 (q, 4H, J=7.1 Hz), 3.23 (s, 2H), 2.62 (m, 4H), 1.18 (t, 3H, J=7.1 Hz), 1.13 (t, 6H, J=7.1 Hz). LC/MS (Method A), rt=0.85 mins., purity=99.2%, calculated mass=501, [M+H]+=502, [M−H]=500. HPLC (Method D): rt=5.5 mins., purity=99.3% @ 210-370 nm and 98.6% @ 372 nm.

Provenance & Evidence