Ammonium Chloride → (7-(4-Amino-2-fluorophenoxy)thieno[3,2-b]pyridin-2-yl)(4-methylpiperazin-1-yl)methanone

Participants

Reaction Steps

Zinc (0.75 g, 11.53 mmol) was added to a suspension of 437 (1.2 g, 2.88 mmol) and ammonium chloride (0.31 g, 5.76 mmol) in a mixture of MeOH (30 mL) and water (5.10 mL). The suspension was heated to reflux for 50 min. After cooling to room temperature, the reaction mixture was filtered and concentrated. The residue was partitioned between DCM, water and ammonium hydroxide. The organic layer was collected, successively washed with water and brine, dried over sodium sulfate, filtered and concentrated. The residue was purified by biotage (SNAP 50 g cartridge; MeOH/DCM: 0/100 to 20/80 over 30CV), to afford the title compound 438 (733 mg, 1.89 mmol, 66% yield) as a yellow solid. MS (m/z): 387.4 (M+H).

Provenance & Evidence