Potassium Phosphate, Tribasic → Tert-butyl (5-cyclopropylpyridin-3-yl)methylcarbamate

Participants

Reaction Conditions

Reaction Steps

To a solution of tert-butyl (5-bromopyridin-3-yl)methylcarbamate (496 mg, 2 mmol), cyclopropyl boronic acid (223 mg, 2.6 mmol), potassium phosphate (1.49 g, 7.0 mmol) and tricyclohexyl phosphine (56 mg, 0.2 mmol) in toluene (9 mL) and water (0.45 mL) under a nitrogen atmosphere was added palladium acetate (22 mg, 0.1 mmol). The mixture was heated at 100° C. for 3 h and then cooled to rt. Water (20 mL) was added and the mixture extracted with EtOAc (2×30 mL), the combined organic extracts were washed with brine (20 mL), dried over Na2SO4 and concentrated in vacuo. Crude product was purified by column chromatography (50% EtOAc in hexanes) afforded tert-butyl (5-cyclopropylpyridin-3-yl)methylcarbamate in 60% yield. (5-cyclopropylpyridin-3-yl)methanamine was then generated by removal of the Boc protecting group by treatment with HCl (in methanol or dioxane) or trifluoroacetic acid in dichloromethane.

Provenance & Evidence