2-Bromopyridine → N-(2-(4-fluorophenyl)-2-methylpropyl)-6-(pyridin-2-yl)pyridazin-3-amine

Participants

Reaction Conditions

Reaction Steps

To a 25 mL round bottom flask was added 2-bromopyridine (500 mg, 3.2 mmol, 1.0 equiv), triisopropylborate (654 mg, 3.5 mmol, 1.1 equiv), and an 80% toluene/THF mixture (16 mL). The mixture was cooled to −78° C. After stirring for 10 min, n-BuLi (1.7 mL, 3.48 mmol, 1.1 equiv of a 2.0 M/hexanes solution) was slowly added over an hour. After the addition was complete, the reaction mixture was stirred for 30 min and allowed to warm to rt and stirred overnight. The reaction was then concentrated at 100° C. and dried in vacuo for 2 h. To 100 mg of this crude solid in a microwave vial was added 6-chloro-N-(2-(4-fluorophenyl)-2-methylpropyl)pyridazin-3-amine (70 mg, 0.25 mmol), Pd2 dba3 (10 mg, 0.011 mmol), PO(tBu)3 (5 mg, 0.030 mmol), potassium fluoride (43 mg, 0.75 mmol), and dioxane (0.75 mL). The reaction was degassed with nitrogen for 5 minutes and then heated in a microwave reactor at 160° C. for 15 min. The reaction was then concentrated, dissolved in EtOAc (25 mL), washed with water, dried over Na2SO4, filtered, concentrated, and purified by reverse phase column chromatography to give 5 mg of N-(2-(4-fluorophenyl)-2-methylpropyl)-6-(pyridin-2-yl)pyridazin-3-amine as a white solid. m/z=323.1 [M+H]+.

Provenance & Evidence