Hydrochloric Acid → 5-(3-amino-1H-pyrazol-1-yl)-2-(6-(methyl(2,2,6,6-tetramethylpiperidin-4-yl)amino)pyridazin-3-yl)phenol

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Reaction Conditions

Reaction Steps

A degassed mixture of 6-(4-(3-amino-1H-pyrazol-1-yl)-2-methoxyphenyl)-N-methyl-N-(2,2,6,6-tetramethylpiperidin-4-yl)pyridazin-3-amine (135 mg, 0.310 mmol), K2CO3 (42.8 mg, 0.310 mmol) and thiophenol (0.032 mL, 0.310 mmol) in NMP (2 mL) was heated at 190° C. under microwave radiation for 20 min. After addition of another 0.05 mmol of thiophenol and K2CO3, the mixture was heated at 190° C. under microwave radiation for another 10 min. The mixture was acidified to pH 2-3 with 1 M HCl aqueous solution, then loaded on a 5 g SCX column. The column was washed with MeOH and eluted with 2 N NH3 in MeOH. The collected fractions were concentrated and dissolved in a mixture of MeOH and DMSO, then purified by preparative HPLC to give 95 mg of 5-(3-amino-1H-pyrazol-1-yl)-2-(6-(methyl(2,2,6,6-tetramethylpiperidin-4-yl)amino)pyridazin-3-yl)phenol as a dark yellow solid. LCMS Rt=0.47 min (LCMS method Q), MS (M+1)=422.3, HRMS: 422.2672 [M+H+].

Provenance & Evidence