Cyanogen Bromide → 4-(1-(5-(5-Amino-1,3,4-oxadiazol-2-yl)-4-cyclobutyl-2-ethylbenzoyl)piperidin-4-yl)benzonitrile

Participants

Reaction Conditions

Reaction Steps

To a solution of 5-(4-(4-cyanophenyl)piperidine-1-carbonyl)-2-cyclobutyl-4-ethylbenzohydrazide (compound 215.6, 600 mg, 1.39 mmol, 1.00 equiv) in 1,4-dioxane (10 mL) was added 10 mL of an aqueous solution of sodium bicarbonate (350 mg, 4.17 mmol, 1.00 equiv). Cyanogen bromide (220 mg, 2.08 mmol, 1.50 equiv) was added to the reaction mixture dropwise. The reaction mixture was stirred at 25° C. for 2 h, then quenched with 20 mL of FeSO4 (aq., sat.) and diluted with DCM. The resulting mixture was stirred vigorously then filtered through celite and washed with 1 M FeSO4, water, and ethyl acetate. The layers were separated and the aqueous phase was extracted with 2×50 mL of DCM. The combined organic layers were dried over anhydrous sodium sulfate and concentrated in vacuo. This resulted in 600 mg (95%) of 4-(1-(5-(5-amino-1,3,4-oxadiazol-2-yl)-4-cyclobutyl-2-ethylbenzoyl)piperidin-4-yl)benzonitrile as an off-white solid.

Provenance & Evidence