Potassium Phosphate, Tribasic → 6-(4-(1H-imidazol-1-yl)-2-methoxyphenyl)-N-methyl-N-(2,2,6,6-tetramethyl-piperidin-4-yl)pyridazin-3-amine

Participants

Reaction Conditions

Reaction Steps

To a microwave vial was added (4-(1H-imidazol-1-yl)-2-methoxyphenyl)boronic acid (120 mg, 0.55 mmol), 6-chloro-N-methyl-N-(2,2,6,6-tetramethylpiperidin-4-yl)pyridazin-3-amine Intermediate 1-1 (156 mg, 0.55 mmol), potassium phosphate (351 mg, 1.65 mmol), Pd2(dba)3 (25.2 mg, 0.028 mmol), and SPhos (22.6 mg, 0.05 mmol), followed by addition of 1,4-dioxane (2 mL)/H2O (0.5 mL). The vial was purged with N2 for 10 minutes and the reaction mixture was heated at 100° C. in the microwave for 40 min. The reaction mixture was concentrated in vacuo and adjusted to pH 3 by 1 M HCl aqueous solution, then loaded on an SCX column. The column was washed with methanol and eluted with 2 N NH3 in methanol. The product-containing fractions were concentrated to afford 6-(4-(1H-imidazol-1-yl)-2-methoxyphenyl)-N-methyl-N-(2,2,6,6-tetramethyl-piperidin-4-yl)pyridazin-3-amine (90 mg, MS: 421.4 [M+H+]).

Provenance & Evidence