Acetic Acid → 2-[2-(2-Chloro-4-iodo-pyridin-3-yl)-7-methyl-3H-benzoimidazol-5-yl]-2,8-diaza-spiro[5.5]undecane

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Reaction Steps

To a solution of 4-(8-benzyl-2,8-diaza-spiro[5.5]undec-2-yl)-2-methyl-6-nitro-phenylamine (394 mg, 1.0 mmol) in MeOH (47.5 mL) were added Pd/C (10%, 40 mg) and acetic acid (2.5 mL). The mixture was stirred under atmospheric hydrogen (balloon) at the room temperature for 3 h and filter over Celite. The filtrate was mixed with 2-chloro-3-formyl-4-iodopyridine (267.5 mg, 1.0 mmol), stirred at the room temperature for 18 h, and evaporated to dryness under reduced pressure. The residue was dissolved in MeOH (10 mL) and 28% aqueous NH4OH solution (0.5 mL) was added. After it was stirred for 5 min, the mixture was concentrated and chromatographed (100:9:1 CH2Cl2/MeOH/28% aqueous NH4OH) to afford the title compound (288 mg, 55%). 1H NMR (CDCl3) δ 1.28-1.72 (8H), 2.57 (s, 3H), 2.57-3.12 (8H), 6.82 (s, 1H), 6.92 (s, 1H), 6.73 (d, J=6 Hz, 1H), 7.98 (d, J=6 Hz, 1H). ESI-MS m/z 522 (MH+).

Provenance & Evidence