3,4-Dihydro-2H-1,4-benzoxazine → 4-[3-(dipyridin-3-ylmethoxy)pyridin-2-yl]-3,4-dihydro-2H-1,4-benzoxazine

Participants

Reaction Steps

To a solution of 2-bromo-3-(dipyridin-3-ylmethoxy)pyridine (150 mg, 0.438 mmol) and 3,4-dihydro-2H-1,4-benzoxazine (59 mg, 0-438 mmol) in dry dioxane (5 mL) was added sodium t-butoxide (63 mg, 0.658 mmol), bis(tri-t-butylphosphine)palladium(0) (22 mg, 0.044 mmol). The mixture was heated to 100 C for 6 h. The reaction was cooled, diluted with water and extracted with methylene chloride. The organic layer was dried over anhydrous sodium sulfate, filtered, and the solvent evaporated. The residue was purified by silica gel chromatography (3-5% MeOH in CH2Cl2) to give 4-[3-(dipyridin-3-ylmethoxy)pyridin-2-yl]-3,4-dihydro-2H-1,4-benzoxazine (2-3). LRMS m/z (M+H) Calcd: 397.5, found: 397.1.

Provenance & Evidence