Boron tribromide → HCID 59436049, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of N-(2-chloro-4,6-difluorophenyl)-10-ethoxypyrido[4,3-c]-1,6-naphthyridin-6-amine and 10-chloro-N-(2-chloro-4,6-difluorophenyl)pyrido[4,3-c]-1,6-naphthyridin-6-amine (1.3 g) in 8 mL methanol was added sodium methoxide (5 mL, 2.06 mmol, 25% weight in methanol) and the mixture was heated to 100° C. for 1 hr. The solution was cooled to room temperature, concentrated, and redissolved with 3:1 CHCl3/i-PrOH followed by a wash with saturated NH4Cl. The organic layers were combined, dried with MgSO4, filtered, and concentrated under reduced pressure. A portion of the crude solution (540 mg) was taken up in CHCl3 (8 mL) and boron tribromide (1M in CH2Cl2, 7 mL, 7.0 mmol) and heated to 85° C. for 1 hr. The solution was cooled to room temperature, extracted with 3:1 CHCl3/i-PrOH, and washed with saturated NaHCO3. The organic layers were dried with MgSO4, filtered, and concentrated to afford the crude product. The crude residue was purified on silica gel (100% CH2Cl2 to 25% MeOH, gradient elution) which afforded the title compound.

Provenance & Evidence