Methanol → 1-(4-Methyl-pyridin-3-yl)-3-(1H-pyrazol-4-yl)-imidazolidin-2-one

Participants

Reaction Steps

Using the same reaction conditions as in Example 14, 1-(4-methyl-pyridin-3-yl)-imidazolidin-2-one (I-14b: 150 mg, 0.8465 mmol) was reacted with 4-bromo-1-trityl-1H-pyrazole (369.3 mg, 0.8465 mmol), 1,4-dioxane (50 mL), copper iodide (16 mg, 0.08465 mmol), trans-1,2-diamino cyclohexane (29 mg, 0.2539 mmol) and potassium carbonate (468 mg, 3.3860 mmol) to afford the crude product. Purification by column chromatography on silica gel (2% MeOH in chloroform) afforded 250 mg of 1-(4-Methyl-pyridin-3-yl)-3-(1-trityl-1H-pyrazol-4-yl)-imidazolidin-2-one (60% yield). Dioxane hydrochloride (10 mL) was added to a stirred solution of 1-(4-methyl-pyridin-3-yl)-3-(1-trityl-1H-pyrazol-4-yl)-imidazolidin-2-one (250 mg, 0.51484 mmol) in dioxane under nitrogen atmosphere at 0° C. The reaction mixture was stirred at room temperature for 2 hours with TLC monitoring (10% MeOH in DCM). The solvent was distilled from the reaction mixture and washed with ether. The precipitate was collected and dried under reduced pressure to afford 80 mg of the product (55% yield).

Provenance & Evidence