Methyl iodide → 6-(Methoxymethyl)-5-methyl-4-[(4-phenoxyphenyl)amino]pyrrolo[1,2-b]pyridazine-3-carbonitrile

Participants

Reaction Conditions

Reaction Steps

To a solution of compound 3B (9.0 mg, 0.025 mmol) in DMF:THF (1:1, 1 mL) at 0° C. was added KOtBu (1.5 M in THF, 0.025 mL, 0.038 mmol). After stirring for 45 min at 0° C., methyl iodide (2 μL, 0.025 mmol) was added and the reaction mixture was stirred for an additional 1 h, warmed to 25° C., and stirred for 3 h. No reaction was observed during this time. The reaction mixture was cooled once more to 0° C., additional KOtBu (1.5 M in THF, 0.25 mL, 0.38 mmol) was added and the reaction mixture was stirred for 30 min, after which time additional methyl iodide (20 μL, 0.25 mmol) was added. After stirring for an additional 2 h at 0° C., the reaction was quenched by the addition of saturated aqueous NH4Cl (10 mL) and dichloromethane (10 mL). The layers were separated, the aqueous phase was extracted with dichloromethane (2×10 mL) and the combined organic extracts were dried over MgSO4, filtered, concentrated, and purified by preparative HPLC (YMC S5 ODS 20×100 mm, eluting with 30-100% aqueous methanol over 15 min containing 0.1% TFA, 20 mL/min) to afford the desired product as a yellow semi-solid. HPLC: 100% at 4.27 min (retention time) (YMC S5 ODS column, 4.6×50 mm, eluting with 10-90% aqueous methanol over 4 min containing 0.2% phosphoric acid, 4 mL/min, monitoring at 220 nm). MS (ES): m/z 385.21 [M+H]+.

Provenance & Evidence