Hydrochloric Acid → HCID 86296962, compound

Participants

Reaction Conditions

Reaction Steps

To 2-bromopyridine (0.02 ml, 0.2 mmol) in tetrahydrofuran (4 mL) at −78° C. was added n-butyllithium (0.15 mL, 0.24 mmol, 1.6 M in hexanes). After 30 minutes, tert-butyl 4-(5-chloropicolinoyl)-6-(3,5-dimethylisoxazol-4-yl)-2-ethoxy-1H-benzo[d]imidazole-1-carboxylate (33 mg, 0.07 mmol) in tetrahydrofuran (1 mL) was added drop-wise to the reaction. After 30 minutes, the reaction was warmed, quenched with saturated NH4Cl(aq) (10 mL), extracted with ethyl acetate (3×10 mL), dried over Na2SO4, and concentrated in vacuo. To the crude residue in ethanol (3 mL) was added hydrochloric acid (0.17 mL, 0.66 mmol, 4 M in 1,4-dioxane) and the mixture was heated to 70° C. in a microwave reactor for 45 minutes. Purification by reverse-phase HPLC (23-40% acetonitrile/water with 0.01% trifluoroacetic acid, Gemini C18 5μ) afforded 4-((5-chloropyridin-2-yl)(hydroxy)(pyridin-2-yl)methyl)-6-(3,5-dimethylisoxazol-4-yl)-1H-benzo[d]imidazol-2(3H)-one as an off-white solid.

Provenance & Evidence