Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1377236 | Bioorganic & Medicinal Chemistry Letters | 2006 | 4 Pages |
Electron rich 6-[(dimethylamino)methylene]amino uracil 1, undergoes [4+2] cycloaddition reactions with various in situ generated glyoxylate imine and imine oxides 6 to provide novel pyrimido[4,5-d]pyrimidine derivatives of biological significance, after elimination of dimethylamine from the (1:1) cycloadducts and oxidative aromatisation. This procedure provides a convenient method for the direct synthesis of pyrimido[4,5-d]pyrimidines in excellent yields when carried out in the solid state and under microwave irradiations.
Graphical abstractElectron-rich 6-[(dimethylamino)methylene]amino uracil 1 undergoes [4+2] cycloaddition reactions with various in situ generated glyoxylate imine and imine oxides to provide novel pyrimido[4,5-d]pyrimidine derivatives of biological significance, after elimination of 1,3-dimethylamine from the (1:1) cycloadducts and oxidative aromatisation.Figure optionsDownload full-size imageDownload as PowerPoint slide