Hydrochloric Acid → HCID 178425626, compound

Participants

Reaction Steps

To a solution of 0.61 g (4.0 mmol) of 1,4-benzodioxan-6-amine in 5 mL of tetrahydrofuran at ambient temperature was added 2.2 mL (4.4 mmol) of 2.0 M (in tetrahydrofuran) sodium bis(trimethylsilyl)amide and the resulting solution was stirred for 20 min. To this reaction mixture was slowly added a solution of 0.47 g (4.0 mmol) of p-tolunitrile in 2 mL of tetrahydrofuran. The resulting mixture was stirred at ambient temperature for 5 hrs and then poured into brine (25 mL) and dichloromethane (50 mL). The organic layer was separated and the aqueous layer was extracted with 25 mL of dichloromethane (25 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo to yield the title compound as brown crystalline solid, which was used without further purification. LC/MS 269.2 (M+1). Step B: Ethyl 1-(2,3-dihydro-1,4-benzodioxin-6-yl)-2-(4-methylphenyl)-1H-imidazole-4-carboxylate. To a mixture of the compound from Step A and 0.80 g (9.5 mmol) of sodium bicarbonate in 10 mL of 1,4-dioxane was added 0.60 mL (4.8 mmol) of ethyl bromopyruvate. The reaction mixture was refluxed overnight. After cooling to room temperature, the solid was filtered off and the filtrate was concentrated in vacuo. Flash chromatography on a Biotage Horizon® system (silica gel, 0 to 50% ethyl acetate in hexanes gradient) gave the title compound as a yellow foam. LC/MS 365.3 (M+1). Step C: 1-(2,3-Dihydro-1,4-benzodioxin-6-yl)-2-(4-methylphenyl)-1H-imidazole-4-carboxylic acid. To a solution of 0.62 g (1.7 mmol) of the compound from Step B in 10 mL of tetrahydrofuran, 5 mL of water and 5 mL of methanol was added 0.80 mL (4.0 mmol) of 5.0 M NaOH solution. The reaction mixture was stirred at ambient temperature overnight. Hydrochloric acid (2.0 M) was then added to neutralize the reaction mixture. After removal of the organic solvents in vacuo, dichloromethane (20 mL) was added and the organic layer was separated. The aqueous layer was extracted with dichloromethane (10 mL), and the combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo to yield the title compound as a yellow foam. LC/MS 337.3 (M+1).

Provenance & Evidence