Potassium Phosphate, Tribasic → 6-(4-(4-amino-1H-pyrazol-1-yl)-2-methoxyphenyl)-N-methyl-N-(2,2,6,6-tetramethylpiperidin-4-yl)pyridazin-3-amine

Participants

Reaction Conditions

Reaction Steps

To a microwave vial was added 1-(3-methoxy-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)-1H-pyrazol-4-amine (92 mg, 0.29 mmol), 6-chloro-N-methyl-N-(2,2,6,6-tetramethylpiperidin-4-yl)pyridazin-3-amine Intermediate 1-1 (75 mg, 0.27 mmol), potassium phosphate (169 mg, 0.78 mmol), Pd2(dba)3 (12.14 mg, 0.01 mmol), and SPhos (10.89 mg, 0.03 mmol), followed by addition of 1,4-dioxane (1 mL)/H2O (0.2 mL). The vial was purged with N2 for 10 minutes and the reaction mixture was heated at 100° C. in a microwave reactor for one hour. The reaction mixture was concentrated in vacuo, then the crude material was adjusted to pH 3 using 1 M HCl aqueous solution, then loaded on an SCX column. The column was washed with methanol then eluted with 2 N ammonia in methanol. The product-containing fractions concentrated to afford 6-(4-(4-amino-1H-pyrazol-1-yl)-2-methoxyphenyl)-N-methyl-N-(2,2,6,6-tetramethylpiperidin-4-yl)pyridazin-3-amine (100 mg, MS: 436.4 [M+H+].).

Provenance & Evidence