Diisobutylaluminum hydride → 6-(Hydroxymethyl)-5-methyl-4-[(4-phenoxyphenyl)amino]pyrrolo[1,2-b]pyridazine-3-carbonitrile

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Reaction Conditions

Reaction Steps

To a solution of compound 3A (41 mg, 0.10 mmol) in THF (2 mL) at −78° C. was added DIBAL-H (1.5 M in toluene, 0.13 mL, 0.20 mmol). The reaction mixture was stirred for 6 h at −78° C., warmed to 0° C. and stirred for an additional 2h. The reaction mixture was quenched by the addition of methanol (3 mL) and sat. aq. Na2CO3 (3 mL) and then poured onto dichloromethane (20 mL). The layers were separated, the aqueous phase was extracted with dichloromethane (2×15 mL), and the combined organic extracts were dried over MgSO4, filtered, and concentrated in vacuo. Purification via preparative HPLC (YMC S5 ODS 20-100 mm, eluting with 30-100% aqueous methanol over 15 min containing 0.1% TFA, 20 mL/min) afforded 33 mg (90% yield) of compound 3B as a yellow solid. HPLC: 100% at 3.98 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 371.19 [M+H]+.

Provenance & Evidence