Triphenylphosphine → 3-(5-Amino-2-methyl-phenyl)-7-methyl-1-phenyl-1H-[1,6]naphthyridin-2-one

Participants

Reaction Conditions

Reaction Steps

A vial is charged with 19 (208 mg, 0.575 mmol), Pd2(dba)3 (26 mg, 0.028 mmol) and Ph3P (37 mg, 0.14 mmol). The vial is evacuated and refilled with N2. Dioxane (12 mL) is added to the vial and the solution is treated with AlMe3 (0.86 mL of a 2M solution in hexane, 1.72 mmol). The mixture is heated in a microwave oven at 140° C. for 20 min. The vial is cooled down to rt and the mixture is extracted with ethyl acetate. The organic phase is washed with 1N NaOH solution, saturated NaHCO3 solution and brine. The solvent is removed in vacuo and the crude product is purified using flash chromatography (hexane:ethyl acetate=2:1) to give 3-(5-amino-2-methyl-phenyl)-7-methyl-1-phenyl-1H-[1,6]naphthyridin-2-one 20. 1H NMR (400 MHz, CDCl3) δ 8.71 (s, 1H), 7.75 (s, 1H), 7.58-7.63 (m, 2H), 7.52-7.56 (m, 1H), 7.28-7.30 (m, 2H), 7.03 (d, 1H), 6.67 (d, 1H), 6.64 (d, 1H), 6.38 (s, 1H), 5.32 (s, 1H), 3.60 (brs, 2H), 2.46 (s, 3H), 2.18 (s, 3H).

Provenance & Evidence