4-Methylmorpholine → 2-(pyridin-3-yloxy)ethyl 4-isopropyl-1,4,6,7-tetrahydro-5H-imidazo[4,5-c]pyridine-5-carboxylate

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Reaction Steps

2-(3-Pyridyloxy)ethanol (0.62 g, 4.40 mmol) was dissolved in DCM (10.0 mL) at 0° C. and NMM (0.50 mL, 4.40 mmol) and 4-nitrophenyl chloroformate (0.90 g, 4.40 mmol) were added. The reaction mixture was stirred at room temperature for 5 h. A solution of Intermediate 1 (0.35 g, 2.10 mmol) and DIPEA (1.10 g, 1.50 mL, 8.50 mmol) in DCM (20 mL) was added and the resulting solution was stirred for 3 d. The solvents were removed in vacuo, the residue was dissolved in MeOH (4 mL) and 1 M aq NaOH solution (4 mL) and the reaction mixture was stirred for 2 h and concentrated in vacuo. The residue was dissolved in EtOAc (60 mL), the organic layer was washed with 1 M aq Na2CO3 solution (5×40 mL), dried (MgSO4) and the solvents were removed in vacuo. The residue was purified by column chromatography (normal phase, 20 g, Strata SI-1, silica gigatube, DCM (200 mL) followed by 2%, 4%, 5% and 10% MeOH in DCM (200 mL)) and reverse phase HPLC (YMC ODS-A 100×20 mm, 5 μm, 25 mL per min, gradient 0% to 40% (over 7 min) then 100% (3 min) MeOH in 10% MeOH/water) to give 2-(pyridin-3-yloxy)ethyl 4-isopropyl-1,4,6,7-tetrahydro-5H-imidazo[4,5-c]pyridine-5-carboxylate (7.4 mg, 1%) as a white solid.

Provenance & Evidence