Triethylamine → Methyl 4-(3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-2-ylmethyl)-benzoate

Participants

Reaction Steps

Et3N (3.18 ml, 22.8 mmol) was added to a stirring solution of 2-H-1,4-benzoxazin-3-(4H)one (2.50 g, 16.8 mmol) and methyl 4-formylbenzoate (4.59 g, 27.5 mmol) in Ac2O (20 ml). The reaction mixture was refluxed 16 h. After this mixture was cooled for 3 days, the solid was filtered and rinsed with ethyl acetate to afford the title compound 266 (657 mg, 13%) as a yellow solid. LRMS: 295.1 (Calc.). 296.0 (found).

Provenance & Evidence