1 结果与讨论
1.1 反应体系的优化
表1 2-氨基苯并-1,3-噁嗪-4-酮合成反应条件的优化aTable 1 Optimization of the reaction conditions for the synthesis of 2-aminobenz-1,3-oxazin-4-ketone |
| Entry | Photocatalyst | Solvent | Base | Yield/% |
|---|---|---|---|---|
| 1 | CuSO4•5H2O | DMF | DMAP | 84 |
| 2 | FeCl3 | DMF | DMAP | 42 |
| 3 | AlCl3 | DMF | DMAP | 14 |
| 4 | CoCl2 | DMF | DMAP | 52 |
| 5 | CuI | DMF | DMAP | 79 |
| 6 | CuCl2 | DMF | DMAP | 96 |
| 7 | - | DMF | DMAP | 25 |
| 8 | CuCl2 | DMSO | DMAP | 92 |
| 9 | CuCl2 | DCE | DMAP | 83 |
| 10 | CuCl2 | EtOH | DMAP | 17 |
| 11 | CuCl2 | MeCN | DMAP | 18 |
| 12 | CuCl2 | Toluene | DMAP | 23 |
| 13 | CuCl2 | 1,4-Dioxane | DMAP | 20 |
| 14 | CuCl2 | DMF | DBU | 10 |
| 15 | CuCl2 | DMF | DBN | ND |
| 16 | CuCl2 | DMF | NaOH | 33 |
| 17 | CuCl2 | DMF | t-BuOK | 21 |
| 18 | CuCl2 | DMF | Na2CO3 | 21 |
| 19 | CuCl2 | DMF | Et3N | 27 |
| 20 | CuCl2 | DMF | Na3PO4 | 32 |
a Reaction conditions: 1a (0.2 mmol), 2a (0.24 mmol), catalyst (10 mol%), base (0.4 mmol), solvent (2.0 mL), open air, r.t., 12 h, ND=Not detected. |
1.2 反应底物的拓展
表2 2-氨基苯甲酸的适用范围aTable 2 Scope of 2-aminobenzoic acid |
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a Reaction conditions: 1 (0.2 mmol), 2a (0.24 mmol), DMAP (0.4 mmol), CuCl2 (10 mol%), open air, DMF (2.0 mL), r.t., 12 h. |
表3 芳基异硫氰酸酯的适用范围aTable 3 Scope of aromatic isothiocyanates |
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a Reaction conditions: 1a (0.2mmol), 2 (0.24mmol), DMAP (0.4mmol), CuCl2 (10 mol%), DMF (2.0mL), open air, r.t., 12 h. |




