Sodium hydride → pyrazin-2-ylmethyl 4-isopropyl-1,4,6,7-tetrahydro-5H-imidazo[4,5-c]pyridine-5-carboxylate

Participants

Reaction Conditions

Reaction Steps

NaH (0.22 g, 5.60 mmol, 60% dispersion in mineral oil) was suspended in THF (10 mL), cooled to 0° C. and pyrazin-2-yl methanol (0.49 mL, 5.00 mmol) was added. The suspension was stirred at 0° C. for 30 min and then added to a solution of Intermediate 2 (0.66 g, 2.00 mmol, 70% pure) in THF (10 mL) and the reaction mixture was stirred at room temperature. An additional such portion of NaH and pyrazin-2-yl methanol in THF was added after 18 h. After 2 d the reaction mixture was quenched with water (10 mL) and the solvents were removed in vacuo. The residue was dissolved in MeOH (10 mL) and 1 M aq NaOH solution (10 mL) and the reaction mixture was stirred at room temperature for 2 h then concentrated in vacuo. The residue was dissolved in EtOAc (120 mL) and the organic layer was washed with 1 M aq Na2CO3 solution (6×100 mL), dried (MgSO4) and the solvents were removed in vacuo. The residue was purified by reverse phase HPLC (Phenomenex Synergi, RP-Hydro 150×10 mm, 10 μm, 15 mL/min, gradient 0% to 100% (over 12 min) then 100% (over 3 min) MeOH in water (1% formic acid)). The residue was de-salted using K2CO3 in DCM to give pyrazin-2-ylmethyl 4-isopropyl-1,4,6,7-tetrahydro-5H-imidazo[4,5-c]pyridine-5-carboxylate (62.9 mg, 10.4%) as a white solid.

Provenance & Evidence