Potassium Carbonate → 3-[2-methoxy-4-(1H-pyrazol-4-yl)phenyl]-6-(2,2,6,6-tetramethylpiperidin-4-yl)oxypyridazine

Participants

Reaction Conditions

Reaction Steps

SiliaCat® DPP-Pd (0.37 g, 0.10 mmol) was added to a microwave vial containing a mixture of 3-(4-chloro-2-methoxyphenyl)-6-((2,2,6,6-tetramethylpiperidin-4-yl)oxy)pyridazine (0.36 g, 0.96 mmol), 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (0.47 g, 2.4 mmol), and K2CO3 (0.53 g, 3.8 mmol) in ethanol/water (10:1, 6.6 mL). The reaction mixture was sealed, then heated in a microwave reactor at 160° C. for 1 h. After cooling, the reaction was purified by solid phase extraction (5 g SiliaBond Carbonate®, MeOH as eluent). The filtrate was concentrated in vacuo and the resulting residue was purified by flash chromatography (silica gel saturated with Et3N, 2 to 25% MeOH in DCM) to give the desired product (0.08 mg, 21%). [M+H]: 408.4; 1H NMR (400 MHz, DMSO-d6) δ 13.01 (bs, 1H), 8.33 (bs, 1H), 8.05 (bs, 1H), 7.94 (d, J=9.5 Hz, 1H), 7.70 (d, J=8.0 Hz, 1H), 7.38 (d, J=1.5 Hz, 1H), 7.34 (dd, J=8.0, 1.5 Hz, 1H), 7.14 (d, J=9.5 Hz, 1H), 5.57-5.74 (m, 1H), 3.90 (s, 3H), 2.00-2.14 (m, 2H), 1.17-1.31 (m, 8H), 1.11 (s, 6H).

Provenance & Evidence